./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2987304591

<...>
forked to background, child pid 3184
no interfaces have a carrier
[   25.560581][ T3185] 8021q: adding VLAN 0 to HW filter on device bond0
[   25.571314][ T3185] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts.
execve("./syz-executor2987304591", ["./syz-executor2987304591"], 0x7fffe4ff06e0 /* 10 vars */) = 0
brk(NULL)                               = 0x5555560ae000
brk(0x5555560aec40)                     = 0x5555560aec40
arch_prctl(ARCH_SET_FS, 0x5555560ae300) = 0
uname({sysname="Linux", nodename="syzkaller", ...}) = 0
set_tid_address(0x5555560ae5d0)         = 3606
set_robust_list(0x5555560ae5e0, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f1d42722430, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f1d42722b00}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f1d427224d0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f1d42722b00}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor2987304591", 4096) = 28
brk(0x5555560cfc40)                     = 0x5555560cfc40
brk(0x5555560d0000)                     = 0x5555560d0000
mprotect(0x7f1d427e3000, 16384, PROT_READ) = 0
mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000
mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000
mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000
openat(AT_FDCWD, "/sys/kernel/debug/failslab/ignore-gfp-wait", O_WRONLY|O_CLOEXEC) = 3
write(3, "N", 1)                        = 1
close(3)                                = 0
openat(AT_FDCWD, "/sys/kernel/debug/fail_futex/ignore-private", O_WRONLY|O_CLOEXEC) = 3
write(3, "N", 1)                        = 1
close(3)                                = 0
openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", O_WRONLY|O_CLOEXEC) = 3
write(3, "N", 1)                        = 1
close(3)                                = 0
openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", O_WRONLY|O_CLOEXEC) = 3
write(3, "N", 1)                        = 1
close(3)                                = 0
openat(AT_FDCWD, "/sys/kernel/debug/fail_page_alloc/min-order", O_WRONLY|O_CLOEXEC) = 3
write(3, "0", 1)                        = 1
close(3)                                = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3607 attached
, child_tidptr=0x5555560ae5d0) = 3607
[pid  3607] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3607] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3607] setpgid(0, 0)               = 0
[pid  3607] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3607] write(3, "1000", 4)         = 4
[pid  3607] close(3)                    = 0
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3607] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3607] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3607] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3608], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3608
./strace-static-x86_64: Process 3608 attached
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] set_robust_list(0x7f1d427129e0, 24 <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3608] <... set_robust_list resumed>) = 0
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3608] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] <... futex resumed>)        = 0
[pid  3607] <... futex resumed>)        = 1
[pid  3608] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... ioctl resumed>)        = 0
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3608] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3607] <... futex resumed>)        = 0
[pid  3608] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... openat resumed>)       = 4
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3608] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3607] <... futex resumed>)        = 0
[pid  3608] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... socketpair resumed>[5, 6]) = 0
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3608] <... futex resumed>)        = 1
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... ioctl resumed>)        = 0
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3608] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3608] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... openat resumed>)       = 7
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3608] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... ioctl resumed>)        = 0
[pid  3608] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3607] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3608] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3608] <... openat resumed>)       = 8
[pid  3608] write(8, "16", 2)           = 2
[pid  3608] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3607] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3607] exit_group(0)               = ?
[pid  3608] <... ioctl resumed>)        = ?
syzkaller login: [   49.213505][ T3608] block nbd0: shutting down sockets
[pid  3608] +++ exited with 0 +++
[pid  3607] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3607, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3612
./strace-static-x86_64: Process 3612 attached
[pid  3612] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3612] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3612] setpgid(0, 0)               = 0
[pid  3612] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3612] write(3, "1000", 4)         = 4
[pid  3612] close(3)                    = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3612] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3612] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3613], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3613
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3613 attached
 <unfinished ...>
[pid  3613] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... futex resumed>)        = 1
[pid  3613] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... futex resumed>)        = 1
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... futex resumed>)        = 1
[pid  3613] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... futex resumed>)        = 1
[pid  3613] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3612] <... futex resumed>)        = 0
[pid  3613] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3612] <... futex resumed>)        = 0
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... openat resumed>)       = 7
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3613] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3613] <... futex resumed>)        = 0
[pid  3613] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... ioctl resumed>)        = 0
[pid  3613] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3612] <... futex resumed>)        = 0
[pid  3613] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3612] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3613] <... openat resumed>)       = 8
[pid  3612] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] write(8, "16", 2)           = 2
[pid  3613] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3612] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3612] exit_group(0)               = ?
[pid  3613] <... ioctl resumed>)        = ?
[   49.542980][ T3613] block nbd0: shutting down sockets
[pid  3613] +++ exited with 0 +++
[pid  3612] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3612, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3614
./strace-static-x86_64: Process 3614 attached
[pid  3614] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3614] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3614] setpgid(0, 0)               = 0
[pid  3614] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3614] write(3, "1000", 4)         = 4
[pid  3614] close(3)                    = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3614] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3614] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3615], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3615
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3615 attached
 <unfinished ...>
[pid  3615] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3615] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... futex resumed>)        = 1
[pid  3615] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... futex resumed>)        = 1
[pid  3615] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... futex resumed>)        = 1
[pid  3615] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... futex resumed>)        = 1
[pid  3615] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3614] <... futex resumed>)        = 0
[pid  3615] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... openat resumed>)       = 7
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3614] <... futex resumed>)        = 0
[pid  3615] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... ioctl resumed>)        = 0
[pid  3615] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3614] <... futex resumed>)        = 0
[pid  3615] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3614] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... openat resumed>)       = 8
[pid  3615] write(8, "16", 2)           = 2
[pid  3615] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3614] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   49.681657][ T3615] debugfs: out of free dentries, can not create file 'timeout'
[pid  3614] exit_group(0)               = ?
[pid  3615] <... ioctl resumed>)        = ?
[   49.862846][ T3615] block nbd0: shutting down sockets
[pid  3615] +++ exited with 0 +++
[pid  3614] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3614, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3616 attached
, child_tidptr=0x5555560ae5d0) = 3616
[pid  3616] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3616] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3616] setpgid(0, 0)               = 0
[pid  3616] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3616] write(3, "1000", 4)         = 4
[pid  3616] close(3)                    = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3616] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3616] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3617], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3617
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3617 attached
 <unfinished ...>
[pid  3617] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... futex resumed>)        = 1
[pid  3617] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... futex resumed>)        = 1
[pid  3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... futex resumed>)        = 1
[pid  3617] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... futex resumed>)        = 1
[pid  3617] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... openat resumed>)       = 7
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3617] <... futex resumed>)        = 1
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... ioctl resumed>)        = 0
[pid  3617] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3617] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] <... futex resumed>)        = 0
[pid  3616] <... futex resumed>)        = 1
[pid  3617] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3616] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] write(8, "16", 2)           = 2
[pid  3617] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3616] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3616] exit_group(0)               = ?
[pid  3617] <... ioctl resumed>)        = ?
[   50.204205][ T3617] block nbd0: shutting down sockets
[pid  3617] +++ exited with 0 +++
[pid  3616] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3616, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3618 attached
, child_tidptr=0x5555560ae5d0) = 3618
[pid  3618] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3618] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3618] setpgid(0, 0)               = 0
[pid  3618] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3618] write(3, "1000", 4)         = 4
[pid  3618] close(3)                    = 0
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3618] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3618] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3619 attached
, parent_tid=[3619], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3619
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3619] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... ioctl resumed>)        = 0
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... futex resumed>)        = 0
[pid  3618] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3619] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3619] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3618] <... futex resumed>)        = 0
[pid  3619] <... openat resumed>)       = 4
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3618] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3619] <... futex resumed>)        = 0
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3618] <... futex resumed>)        = 0
[pid  3619] <... socketpair resumed>[5, 6]) = 0
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... ioctl resumed>)        = 0
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3618] <... futex resumed>)        = 0
[pid  3619] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... openat resumed>)       = 7
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3618] <... futex resumed>)        = 0
[pid  3619] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... ioctl resumed>)        = 0
[pid  3619] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3618] <... futex resumed>)        = 0
[pid  3619] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... openat resumed>)       = 8
[pid  3619] write(8, "16", 2)           = 2
[pid  3619] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3618] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3618] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3618] exit_group(0 <unfinished ...>
[pid  3619] <... ioctl resumed>)        = ?
[pid  3618] <... exit_group resumed>)   = ?
[   50.532163][ T3619] block nbd0: shutting down sockets
[pid  3619] +++ exited with 0 +++
[pid  3618] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3618, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3620 attached
, child_tidptr=0x5555560ae5d0) = 3620
[pid  3620] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3620] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3620] setpgid(0, 0)               = 0
[pid  3620] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3620] write(3, "1000", 4)         = 4
[pid  3620] close(3)                    = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3620] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3620] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3621], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3621
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3621 attached
 <unfinished ...>
[pid  3621] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3621] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[pid  3621] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[pid  3621] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[pid  3621] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[pid  3621] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3621] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3620] <... futex resumed>)        = 0
[pid  3621] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... openat resumed>)       = 7
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3621] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3620] <... futex resumed>)        = 0
[pid  3621] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... ioctl resumed>)        = 0
[pid  3621] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3621] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3620] <... futex resumed>)        = 0
[pid  3621] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3620] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... openat resumed>)       = 8
[pid  3621] write(8, "16", 2)           = 2
[pid  3621] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3620] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3620] exit_group(0 <unfinished ...>
[pid  3621] <... ioctl resumed>)        = ?
[pid  3620] <... exit_group resumed>)   = ?
[pid  3621] +++ exited with 0 +++
[pid  3620] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3620, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
[   50.860749][ T3621] block nbd0: shutting down sockets
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3622
./strace-static-x86_64: Process 3622 attached
[pid  3622] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3622] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3622] setpgid(0, 0)               = 0
[pid  3622] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3622] write(3, "1000", 4)         = 4
[pid  3622] close(3)                    = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3622] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3622] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3623], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3623
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3623 attached
 <unfinished ...>
[pid  3623] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3623] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... futex resumed>)        = 1
[pid  3623] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... futex resumed>)        = 1
[pid  3623] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... futex resumed>)        = 1
[pid  3623] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3623] <... futex resumed>)        = 1
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... ioctl resumed>)        = 0
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3622] <... futex resumed>)        = 0
[pid  3623] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3622] <... futex resumed>)        = 0
[pid  3623] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... openat resumed>)       = 7
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3622] <... futex resumed>)        = 0
[pid  3623] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3622] <... futex resumed>)        = 0
[pid  3623] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... ioctl resumed>)        = 0
[pid  3623] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3622] <... futex resumed>)        = 0
[pid  3623] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3622] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... openat resumed>)       = 8
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] write(8, "16", 2)           = 2
[pid  3623] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3622] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   51.003420][ T3623] debugfs: out of free dentries, can not create file 'timeout'
[pid  3622] exit_group(0)               = ?
[pid  3623] <... ioctl resumed>)        = ?
[   51.194603][ T3623] block nbd0: shutting down sockets
[pid  3623] +++ exited with 0 +++
[pid  3622] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3622, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3624
./strace-static-x86_64: Process 3624 attached
[pid  3624] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3624] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3624] setpgid(0, 0)               = 0
[pid  3624] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3624] write(3, "1000", 4)         = 4
[pid  3624] close(3)                    = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3624] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3624] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3625], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3625
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3625 attached
 <unfinished ...>
[pid  3625] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3625] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3624] <... futex resumed>)        = 0
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... futex resumed>)        = 1
[pid  3625] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3624] <... futex resumed>)        = 0
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... futex resumed>)        = 1
[pid  3625] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3624] <... futex resumed>)        = 0
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... futex resumed>)        = 1
[pid  3625] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3624] <... futex resumed>)        = 0
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... futex resumed>)        = 1
[pid  3625] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3624] <... futex resumed>)        = 0
[pid  3625] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3624] <... futex resumed>)        = 0
[pid  3625] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... openat resumed>)       = 7
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3624] <... futex resumed>)        = 0
[pid  3625] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3624] <... futex resumed>)        = 0
[pid  3625] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... ioctl resumed>)        = 0
[pid  3625] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3624] <... futex resumed>)        = 0
[pid  3625] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3624] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3624] <... futex resumed>)        = 0
[pid  3625] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3624] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3625] <... openat resumed>)       = 8
[pid  3625] write(8, "16", 2)           = 2
[pid  3625] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3624] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3624] exit_group(0 <unfinished ...>
[pid  3625] <... ioctl resumed>)        = ?
[pid  3624] <... exit_group resumed>)   = ?
[pid  3625] +++ exited with 0 +++
[pid  3624] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3624, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3626
./strace-static-x86_64: Process 3626 attached
[pid  3626] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3626] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3626] setpgid(0, 0)               = 0
[pid  3626] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3626] write(3, "1000", 4)         = 4
[pid  3626] close(3)                    = 0
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3626] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3626] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3626] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3627 attached
, parent_tid=[3627], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3627
[pid  3627] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3626] <... futex resumed>)        = 1
[pid  3627] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3626] <... futex resumed>)        = 1
[pid  3627] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3626] <... futex resumed>)        = 1
[pid  3627] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3627] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3626] <... futex resumed>)        = 0
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[   51.519818][ T3625] block nbd0: shutting down sockets
[pid  3627] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3626] <... futex resumed>)        = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] <... futex resumed>)        = 0
[pid  3627] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3627] <... openat resumed>)       = 7
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3626] <... futex resumed>)        = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] <... futex resumed>)        = 0
[pid  3627] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3627] <... ioctl resumed>)        = 0
[pid  3627] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3626] <... futex resumed>)        = 0
[pid  3627] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3626] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3626] <... futex resumed>)        = 0
[pid  3627] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3626] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3627] <... openat resumed>)       = 8
[pid  3627] write(8, "16", 2)           = 2
[pid  3627] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3626] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3626] exit_group(0)               = ?
[pid  3627] <... ioctl resumed>)        = ?
[   51.822471][ T3627] block nbd0: shutting down sockets
[pid  3627] +++ exited with 0 +++
[pid  3626] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3626, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3628 attached
, child_tidptr=0x5555560ae5d0) = 3628
[pid  3628] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3628] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3628] setpgid(0, 0)               = 0
[pid  3628] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3628] write(3, "1000", 4)         = 4
[pid  3628] close(3)                    = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3628] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3628] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3629], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3629
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3629 attached
 <unfinished ...>
[pid  3629] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3629] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] <... futex resumed>)        = 1
[pid  3629] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] <... futex resumed>)        = 1
[pid  3629] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] <... futex resumed>)        = 1
[pid  3629] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] <... futex resumed>)        = 1
[pid  3629] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3628] <... futex resumed>)        = 0
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3629] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3628] <... futex resumed>)        = 0
[pid  3629] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3628] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3629] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3628] <... futex resumed>)        = 0
[pid  3629] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3628] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3629] <... openat resumed>)       = 8
[pid  3629] write(8, "16", 2)           = 2
[pid  3629] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3628] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   51.971183][ T3629] debugfs: out of free dentries, can not create file 'timeout'
[pid  3628] exit_group(0)               = ?
[pid  3629] <... ioctl resumed>)        = ?
[pid  3629] +++ exited with 0 +++
[pid  3628] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3628, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3630
[   52.150826][ T3629] block nbd0: shutting down sockets
./strace-static-x86_64: Process 3630 attached
[pid  3630] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3630] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3630] setpgid(0, 0)               = 0
[pid  3630] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3630] write(3, "1000", 4)         = 4
[pid  3630] close(3)                    = 0
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3630] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3630] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3630] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3631 attached
, parent_tid=[3631], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3631
[pid  3631] set_robust_list(0x7f1d427129e0, 24 <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... set_robust_list resumed>) = 0
[pid  3630] <... futex resumed>)        = 0
[pid  3631] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... openat resumed>)       = 3
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] <... futex resumed>)        = 0
[pid  3631] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... ioctl resumed>)        = 0
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] <... futex resumed>)        = 0
[pid  3631] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... openat resumed>)       = 4
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] <... futex resumed>)        = 0
[pid  3631] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... socketpair resumed>[5, 6]) = 0
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] <... futex resumed>)        = 0
[pid  3631] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... ioctl resumed>)        = 0
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... futex resumed>)        = 0
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3631] <... futex resumed>)        = 1
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... ioctl resumed>)        = 0
[pid  3631] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3630] <... futex resumed>)        = 0
[pid  3631] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3630] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] <... futex resumed>)        = 0
[pid  3631] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3630] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3631] <... openat resumed>)       = 8
[pid  3631] write(8, "16", 2)           = 2
[pid  3631] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3630] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   52.291491][ T3631] debugfs: out of free dentries, can not create file 'timeout'
[pid  3630] exit_group(0 <unfinished ...>
[pid  3631] <... ioctl resumed>)        = ?
[pid  3630] <... exit_group resumed>)   = ?
[pid  3631] +++ exited with 0 +++
[pid  3630] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3630, si_uid=0, si_status=0, si_utime=1, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3632
./strace-static-x86_64: Process 3632 attached
[pid  3632] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3632] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3632] setpgid(0, 0)               = 0
[pid  3632] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3632] write(3, "1000", 4)         = 4
[pid  3632] close(3)                    = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3632] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3632] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3633], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3633
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3633 attached
 <unfinished ...>
[pid  3633] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3633] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] <... futex resumed>)        = 1
[pid  3633] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3633] <... futex resumed>)        = 1
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3633] <... futex resumed>)        = 1
[pid  3633] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] <... socketpair resumed>[5, 6]) = 0
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3633] <... futex resumed>)        = 1
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[   52.480895][ T3631] block nbd0: shutting down sockets
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] <... ioctl resumed>)        = 0
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3632] <... futex resumed>)        = 0
[pid  3633] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3632] <... futex resumed>)        = 0
[pid  3633] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] <... openat resumed>)       = 7
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3632] <... futex resumed>)        = 0
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3633] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3632] <... futex resumed>)        = 0
[pid  3633] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3632] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] <... openat resumed>)       = 8
[pid  3632] <... futex resumed>)        = 0
[pid  3632] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3633] write(8, "16", 2)           = 2
[pid  3633] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3632] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3632] exit_group(0 <unfinished ...>
[pid  3633] <... ioctl resumed>)        = ?
[pid  3632] <... exit_group resumed>)   = ?
[pid  3633] +++ exited with 0 +++
[pid  3632] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3632, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3634
./strace-static-x86_64: Process 3634 attached
[pid  3634] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3634] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3634] setpgid(0, 0)               = 0
[pid  3634] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3634] write(3, "1000", 4)         = 4
[pid  3634] close(3)                    = 0
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3634] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3634] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3635], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3635
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3635 attached
 <unfinished ...>
[pid  3635] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3635] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] <... futex resumed>)        = 0
[pid  3635] <... futex resumed>)        = 1
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] <... futex resumed>)        = 0
[pid  3635] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... openat resumed>)       = 4
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] <... futex resumed>)        = 0
[pid  3635] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... socketpair resumed>[5, 6]) = 0
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] <... futex resumed>)        = 0
[pid  3635] <... futex resumed>)        = 1
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3635] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3634] <... futex resumed>)        = 0
[   52.763511][ T3633] block nbd0: shutting down sockets
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... ioctl resumed>)        = 0
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] <... futex resumed>)        = 0
[pid  3635] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3635] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3634] <... futex resumed>)        = 0
[pid  3635] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... openat resumed>)       = 7
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] <... futex resumed>)        = 0
[pid  3635] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3635] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3634] <... futex resumed>)        = 0
[pid  3635] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... ioctl resumed>)        = 0
[pid  3635] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] <... futex resumed>)        = 0
[pid  3635] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3634] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3635] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3634] <... futex resumed>)        = 0
[pid  3635] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3634] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3635] <... openat resumed>)       = 8
[pid  3635] write(8, "16", 2)           = 2
[pid  3635] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3634] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3634] exit_group(0 <unfinished ...>
[pid  3635] <... ioctl resumed>)        = ?
[pid  3634] <... exit_group resumed>)   = ?
[   53.064582][ T3635] block nbd0: shutting down sockets
[pid  3635] +++ exited with 0 +++
[pid  3634] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3634, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3636
./strace-static-x86_64: Process 3636 attached
[pid  3636] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3636] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3636] setpgid(0, 0)               = 0
[pid  3636] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3636] write(3, "1000", 4)         = 4
[pid  3636] close(3)                    = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3636] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3636] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3637], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3637
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3637 attached
 <unfinished ...>
[pid  3637] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3637] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... futex resumed>)        = 1
[pid  3637] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... futex resumed>)        = 1
[pid  3637] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... futex resumed>)        = 1
[pid  3637] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... futex resumed>)        = 1
[pid  3637] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3637] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3637] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3636] <... futex resumed>)        = 0
[pid  3637] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... openat resumed>)       = 7
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3637] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3637] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3636] <... futex resumed>)        = 0
[pid  3637] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... ioctl resumed>)        = 0
[pid  3637] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3637] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3636] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3637] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3636] <... futex resumed>)        = 0
[pid  3637] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3636] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3637] <... openat resumed>)       = 8
[pid  3637] write(8, "16", 2)           = 2
[pid  3637] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3636] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   53.221374][ T3637] debugfs: out of free dentries, can not create file 'timeout'
[pid  3636] exit_group(0 <unfinished ...>
[pid  3637] <... ioctl resumed>)        = ?
[pid  3636] <... exit_group resumed>)   = ?
[pid  3637] +++ exited with 0 +++
[   53.401144][ T3637] block nbd0: shutting down sockets
[pid  3636] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3636, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3638
./strace-static-x86_64: Process 3638 attached
[pid  3638] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3638] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3638] setpgid(0, 0)               = 0
[pid  3638] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3638] write(3, "1000", 4)         = 4
[pid  3638] close(3)                    = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3638] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3638] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3638] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3639], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3639
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3639 attached
 <unfinished ...>
[pid  3639] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3639] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] <... futex resumed>)        = 1
[pid  3639] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] <... futex resumed>)        = 1
[pid  3639] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3639] <... futex resumed>)        = 1
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] <... socketpair resumed>[5, 6]) = 0
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] <... futex resumed>)        = 1
[pid  3638] <... futex resumed>)        = 0
[pid  3639] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] <... ioctl resumed>)        = 0
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3638] <... futex resumed>)        = 0
[pid  3639] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3639] <... openat resumed>)       = 7
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3638] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] <... ioctl resumed>)        = 0
[pid  3639] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3638] <... futex resumed>)        = 0
[pid  3638] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3639] <... openat resumed>)       = 8
[pid  3638] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3639] write(8, "16", 2)           = 2
[pid  3639] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3638] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   53.563352][ T3639] debugfs: out of free dentries, can not create file 'timeout'
[pid  3638] exit_group(0)               = ?
[pid  3639] <... ioctl resumed>)        = ?
[   53.743612][ T3639] block nbd0: shutting down sockets
[pid  3639] +++ exited with 0 +++
[pid  3638] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3638, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3640
./strace-static-x86_64: Process 3640 attached
[pid  3640] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3640] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3640] setpgid(0, 0)               = 0
[pid  3640] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3640] write(3, "1000", 4)         = 4
[pid  3640] close(3)                    = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3640] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3640] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3641], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3641
./strace-static-x86_64: Process 3641 attached
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3641] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3641] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3641] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3640] <... futex resumed>)        = 0
[pid  3641] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] <... openat resumed>)       = 7
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3641] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3641] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3640] <... futex resumed>)        = 0
[pid  3641] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] <... ioctl resumed>)        = 0
[pid  3641] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3640] <... futex resumed>)        = 0
[pid  3641] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3640] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3641] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3640] <... futex resumed>)        = 0
[pid  3641] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3640] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3641] <... openat resumed>)       = 8
[pid  3641] write(8, "16", 2)           = 2
[pid  3641] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3640] exit_group(0 <unfinished ...>
[pid  3641] <... ioctl resumed>)        = ?
[pid  3640] <... exit_group resumed>)   = ?
[pid  3641] +++ exited with 0 +++
[pid  3640] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3640, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3642 attached
, child_tidptr=0x5555560ae5d0) = 3642
[pid  3642] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3642] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3642] setpgid(0, 0)               = 0
[pid  3642] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3642] write(3, "1000", 4)         = 4
[pid  3642] close(3)                    = 0
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3642] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3642] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3642] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3643 attached
, parent_tid=[3643], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3643
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3643] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3642] <... futex resumed>)        = 0
[pid  3643] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3643] <... ioctl resumed>)        = 0
[pid  3642] <... futex resumed>)        = 0
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... futex resumed>)        = 0
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3643] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3642] <... futex resumed>)        = 0
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... futex resumed>)        = 0
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3643] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3643] <... socketpair resumed>[5, 6]) = 0
[pid  3642] <... futex resumed>)        = 0
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... futex resumed>)        = 0
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3643] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   54.062197][ T3641] block nbd0: shutting down sockets
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... ioctl resumed>)        = 0
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3642] <... futex resumed>)        = 0
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3643] <... futex resumed>)        = 0
[pid  3642] <... futex resumed>)        = 1
[pid  3643] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... openat resumed>)       = 7
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3642] <... futex resumed>)        = 0
[pid  3643] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... ioctl resumed>)        = 0
[pid  3643] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3642] <... futex resumed>)        = 0
[pid  3643] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3642] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3643] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3642] <... futex resumed>)        = 0
[pid  3643] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3643] <... openat resumed>)       = 8
[pid  3643] write(8, "16", 2)           = 2
[pid  3643] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3642] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3642] exit_group(0 <unfinished ...>
[pid  3643] <... ioctl resumed>)        = ?
[pid  3642] <... exit_group resumed>)   = ?
[   54.385449][ T3643] block nbd0: shutting down sockets
[pid  3643] +++ exited with 0 +++
[pid  3642] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3642, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3644
./strace-static-x86_64: Process 3644 attached
[pid  3644] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3644] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3644] setpgid(0, 0)               = 0
[pid  3644] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3644] write(3, "1000", 4)         = 4
[pid  3644] close(3)                    = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3644] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3644] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3645], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3645
./strace-static-x86_64: Process 3645 attached
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3645] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = 0
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... futex resumed>)        = 1
[pid  3645] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = 0
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... futex resumed>)        = 1
[pid  3645] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = 0
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... futex resumed>)        = 1
[pid  3645] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = 0
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... futex resumed>)        = 1
[pid  3645] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3644] <... futex resumed>)        = 0
[pid  3645] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3644] <... futex resumed>)        = 0
[pid  3645] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... openat resumed>)       = 7
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3644] <... futex resumed>)        = 0
[pid  3645] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3644] <... futex resumed>)        = 0
[pid  3645] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... ioctl resumed>)        = 0
[pid  3645] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3644] <... futex resumed>)        = 0
[pid  3645] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3644] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3644] <... futex resumed>)        = 0
[pid  3645] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3644] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3645] <... openat resumed>)       = 8
[pid  3645] write(8, "16", 2)           = 2
[pid  3645] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3644] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   54.542466][ T3645] debugfs: out of free dentries, can not create file 'timeout'
[pid  3644] exit_group(0 <unfinished ...>
[pid  3645] <... ioctl resumed>)        = ?
[pid  3644] <... exit_group resumed>)   = ?
[pid  3645] +++ exited with 0 +++
[   54.723947][ T3645] block nbd0: shutting down sockets
[pid  3644] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3644, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3646
./strace-static-x86_64: Process 3646 attached
[pid  3646] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3646] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3646] setpgid(0, 0)               = 0
[pid  3646] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3646] write(3, "1000", 4)         = 4
[pid  3646] close(3)                    = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3646] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3646] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3647], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3647
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3647 attached
 <unfinished ...>
[pid  3647] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3647] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3647] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3647] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3647] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3647] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3646] <... futex resumed>)        = 0
[pid  3647] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3647] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3646] <... futex resumed>)        = 0
[pid  3647] <... openat resumed>)       = 7
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=49000000} <unfinished ...>
[pid  3647] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3647] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3646] <... futex resumed>)        = 0
[pid  3646] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3647] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3647] write(8, "16", 2)           = 2
[pid  3647] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3646] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3646] exit_group(0)               = ?
[pid  3647] <... ioctl resumed>)        = ?
[   55.042794][ T3647] block nbd0: shutting down sockets
[pid  3647] +++ exited with 0 +++
[pid  3646] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3646, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3648
./strace-static-x86_64: Process 3648 attached
[pid  3648] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3648] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3648] setpgid(0, 0)               = 0
[pid  3648] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3648] write(3, "1000", 4)         = 4
[pid  3648] close(3)                    = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3648] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3648] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3649], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3649
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3649 attached
 <unfinished ...>
[pid  3649] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3649] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... futex resumed>)        = 1
[pid  3649] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... futex resumed>)        = 1
[pid  3649] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... futex resumed>)        = 1
[pid  3649] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... futex resumed>)        = 1
[pid  3649] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3648] <... futex resumed>)        = 0
[pid  3649] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3649] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3649] <... openat resumed>)       = 7
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3649] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3649] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3648] <... futex resumed>)        = 0
[pid  3649] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... ioctl resumed>)        = 0
[pid  3649] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3648] <... futex resumed>)        = 0
[pid  3649] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3648] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3649] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3648] <... futex resumed>)        = 0
[pid  3649] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3648] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3649] <... openat resumed>)       = 8
[pid  3649] write(8, "16", 2)           = 2
[pid  3649] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3648] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3648] exit_group(0)               = ?
[pid  3649] <... ioctl resumed>)        = ?
[   55.394770][ T3649] block nbd0: shutting down sockets
[pid  3649] +++ exited with 0 +++
[pid  3648] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3648, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3650
./strace-static-x86_64: Process 3650 attached
[pid  3650] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3650] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3650] setpgid(0, 0)               = 0
[pid  3650] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3650] write(3, "1000", 4)         = 4
[pid  3650] close(3)                    = 0
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3650] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3650] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3650] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3651], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3651
./strace-static-x86_64: Process 3651 attached
[pid  3651] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3651] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3651] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] <... openat resumed>)       = 3
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3650] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3651] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3651] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3650] <... futex resumed>)        = 1
[pid  3651] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] <... openat resumed>)       = 4
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3650] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3650] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3650] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3650] <... futex resumed>)        = 1
[pid  3651] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3651] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3650] <... futex resumed>)        = 0
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] <... ioctl resumed>)        = 0
[pid  3651] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3650] <... futex resumed>)        = 0
[pid  3651] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3650] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3650] <... futex resumed>)        = 1
[pid  3651] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3650] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3651] write(8, "16", 2)           = 2
[pid  3651] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   55.553484][ T3651] debugfs: out of free dentries, can not create file 'timeout'
[pid  3650] exit_group(0)               = ?
[pid  3651] <... ioctl resumed>)        = ?
[   55.734124][ T3651] block nbd0: shutting down sockets
[pid  3651] +++ exited with 0 +++
[pid  3650] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3650, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3652 attached
, child_tidptr=0x5555560ae5d0) = 3652
[pid  3652] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3652] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3652] setpgid(0, 0)               = 0
[pid  3652] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3652] write(3, "1000", 4)         = 4
[pid  3652] close(3)                    = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3652] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3652] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3653], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3653
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3653 attached
 <unfinished ...>
[pid  3653] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3653] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... futex resumed>)        = 1
[pid  3653] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... futex resumed>)        = 1
[pid  3653] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... futex resumed>)        = 1
[pid  3653] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... futex resumed>)        = 1
[pid  3653] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3652] <... futex resumed>)        = 0
[pid  3653] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3653] <... openat resumed>)       = 7
[pid  3652] <... futex resumed>)        = 0
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... futex resumed>)        = 0
[pid  3652] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... ioctl resumed>)        = 0
[pid  3653] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3652] <... futex resumed>)        = 0
[pid  3653] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3652] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3653] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3652] <... futex resumed>)        = 0
[pid  3653] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3652] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3653] <... openat resumed>)       = 8
[pid  3653] write(8, "16", 2)           = 2
[pid  3653] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3652] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   55.862770][ T3653] debugfs: out of free dentries, can not create file 'timeout'
[pid  3652] exit_group(0 <unfinished ...>
[pid  3653] <... ioctl resumed>)        = ?
[pid  3652] <... exit_group resumed>)   = ?
[pid  3653] +++ exited with 0 +++
[pid  3652] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3652, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3654
./strace-static-x86_64: Process 3654 attached
[pid  3654] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3654] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3654] setpgid(0, 0)               = 0
[pid  3654] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3654] write(3, "1000", 4)         = 4
[pid  3654] close(3)                    = 0
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3654] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3654] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3655], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3655
./strace-static-x86_64: Process 3655 attached
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] set_robust_list(0x7f1d427129e0, 24 <unfinished ...>
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3655] <... set_robust_list resumed>) = 0
[pid  3655] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3655] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3655] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3655] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3655] <... openat resumed>)       = 4
[pid  3655] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3655] <... socketpair resumed>[5, 6]) = 0
[pid  3655] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   56.041896][ T3653] block nbd0: shutting down sockets
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out)
[pid  3654] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3654] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3654] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3656 attached
 <unfinished ...>
[pid  3656] set_robust_list(0x7f1d426f19e0, 24 <unfinished ...>
[pid  3654] <... clone resumed>, parent_tid=[3656], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3656
[pid  3656] <... set_robust_list resumed>) = 0
[pid  3654] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3656] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3656] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3654] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3655] <... ioctl resumed>)        = 0
[pid  3655] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3654] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3654] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3654] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3654] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3655] <... futex resumed>)        = 0
[pid  3654] <... futex resumed>)        = 1
[pid  3655] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3654] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3655] <... openat resumed>)       = 8
[pid  3655] write(8, "16", 2 <unfinished ...>
[pid  3656] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3655] <... write resumed>)        = 2
[pid  3656] <... futex resumed>)        = 0
[pid  3655] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3656] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3654] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   56.178481][ T3656] block nbd0: Device being setup by another task
[pid  3654] exit_group(0 <unfinished ...>
[pid  3656] <... futex resumed>)        = ?
[pid  3654] <... exit_group resumed>)   = ?
[pid  3656] +++ exited with 0 +++
[pid  3655] <... ioctl resumed>)        = ?
[   56.366959][ T3655] block nbd0: shutting down sockets
[pid  3655] +++ exited with 0 +++
[pid  3654] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3654, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3657
./strace-static-x86_64: Process 3657 attached
[pid  3657] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3657] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3657] setpgid(0, 0)               = 0
[pid  3657] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3657] write(3, "1000", 4)         = 4
[pid  3657] close(3)                    = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3657] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3657] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3658], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3658
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3658 attached
 <unfinished ...>
[pid  3658] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3658] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3658] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... futex resumed>)        = 1
[pid  3658] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3658] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... futex resumed>)        = 1
[pid  3658] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3658] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... futex resumed>)        = 1
[pid  3658] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3658] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... futex resumed>)        = 1
[pid  3658] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3657] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3657] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3657] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3657] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3659], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3659
[pid  3657] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3659 attached
 <unfinished ...>
[pid  3659] set_robust_list(0x7f1d426f19e0, 24) = 0
[pid  3659] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3659] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3659] <... futex resumed>)        = 1
[pid  3659] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3658] <... ioctl resumed>)        = 0
[pid  3658] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3658] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3659] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3659] <... futex resumed>)        = 1
[pid  3657] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3659] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3658] <... futex resumed>)        = 0
[pid  3658] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3658] write(8, "16", 2)           = 2
[pid  3658] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3657] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   56.518414][ T3659] block nbd0: Device being setup by another task
[   56.528155][ T3658] debugfs: out of free dentries, can not create file 'timeout'
[pid  3657] exit_group(0 <unfinished ...>
[pid  3659] <... futex resumed>)        = ?
[pid  3657] <... exit_group resumed>)   = ?
[pid  3659] +++ exited with 0 +++
[pid  3658] <... ioctl resumed>)        = ?
[pid  3658] +++ exited with 0 +++
[pid  3657] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3657, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
[   56.710480][ T3658] block nbd0: shutting down sockets
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3660
./strace-static-x86_64: Process 3660 attached
[pid  3660] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3660] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3660] setpgid(0, 0)               = 0
[pid  3660] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3660] write(3, "1000", 4)         = 4
[pid  3660] close(3)                    = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3660] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3660] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3661], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3661
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3661 attached
 <unfinished ...>
[pid  3661] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3661] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... futex resumed>)        = 1
[pid  3661] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... futex resumed>)        = 1
[pid  3661] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... futex resumed>)        = 1
[pid  3661] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... futex resumed>)        = 1
[pid  3661] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] <... futex resumed>)        = 0
[pid  3661] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3660] <... futex resumed>)        = 0
[pid  3661] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... openat resumed>)       = 7
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] <... futex resumed>)        = 0
[pid  3661] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3660] <... futex resumed>)        = 0
[pid  3661] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... ioctl resumed>)        = 0
[pid  3661] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] <... futex resumed>)        = 0
[pid  3661] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3660] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3660] <... futex resumed>)        = 0
[pid  3661] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3660] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3661] <... openat resumed>)       = 8
[pid  3661] write(8, "16", 2)           = 2
[pid  3661] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3660] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   56.891275][ T3661] kobject_add_internal failed for 0 (error: -12 parent: mq)
[pid  3660] exit_group(0 <unfinished ...>
[pid  3661] <... ioctl resumed>)        = ?
[pid  3660] <... exit_group resumed>)   = ?
[pid  3661] +++ exited with 0 +++
[   57.028687][ T3661] block nbd0: shutting down sockets
[pid  3660] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3660, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3662
./strace-static-x86_64: Process 3662 attached
[pid  3662] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3662] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3662] setpgid(0, 0)               = 0
[pid  3662] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3662] write(3, "1000", 4)         = 4
[pid  3662] close(3)                    = 0
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3662] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3662] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3662] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3663], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3663
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3663 attached
 <unfinished ...>
[pid  3663] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3663] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3662] <... futex resumed>)        = 0
[pid  3663] <... futex resumed>)        = 1
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3662] <... futex resumed>)        = 0
[pid  3663] <... ioctl resumed>)        = 0
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3662] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3663] <... futex resumed>)        = 0
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3662] <... futex resumed>)        = 0
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... openat resumed>)       = 4
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3662] <... futex resumed>)        = 0
[pid  3663] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3662] <... futex resumed>)        = 0
[pid  3663] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... socketpair resumed>[5, 6]) = 0
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3662] <... futex resumed>)        = 0
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... futex resumed>)        = 1
[pid  3663] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3662] <... futex resumed>)        = 0
[pid  3663] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3662] <... futex resumed>)        = 0
[pid  3663] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... openat resumed>)       = 7
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3662] <... futex resumed>)        = 0
[pid  3663] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3662] <... futex resumed>)        = 0
[pid  3663] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... ioctl resumed>)        = 0
[pid  3663] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3662] <... futex resumed>)        = 0
[pid  3663] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3662] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3663] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3662] <... futex resumed>)        = 0
[pid  3663] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3662] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3663] <... openat resumed>)       = 8
[pid  3663] write(8, "16", 2)           = 2
[pid  3663] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3662] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3662] exit_group(0)               = ?
[pid  3663] <... ioctl resumed>)        = ?
[   57.381882][ T3663] block nbd0: shutting down sockets
[pid  3663] +++ exited with 0 +++
[pid  3662] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3662, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3664
./strace-static-x86_64: Process 3664 attached
[pid  3664] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3664] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3664] setpgid(0, 0)               = 0
[pid  3664] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3664] write(3, "1000", 4)         = 4
[pid  3664] close(3)                    = 0
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3664] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3664] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3665 attached
, parent_tid=[3665], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3665
[pid  3665] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3665] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] <... futex resumed>)        = 0
[pid  3664] <... futex resumed>)        = 1
[pid  3665] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3665] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3665] <... futex resumed>)        = 0
[pid  3665] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... ioctl resumed>)        = 0
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3664] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3664] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3664] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3664] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3666 attached
, parent_tid=[3666], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3666
[pid  3666] set_robust_list(0x7f1d426f19e0, 24) = 0
[pid  3665] <... ioctl resumed>)        = 0
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3665] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3666] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3666] <... futex resumed>)        = 0
[pid  3666] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3664] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3666] <... openat resumed>)       = 7
[pid  3666] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3666] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] <... futex resumed>)        = 0
[pid  3664] <... futex resumed>)        = 1
[pid  3665] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... ioctl resumed>)        = 0
[pid  3665] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3665] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] <... futex resumed>)        = 0
[pid  3664] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] <... futex resumed>)        = 0
[pid  3664] <... futex resumed>)        = 1
[pid  3665] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3664] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... openat resumed>)       = 8
[pid  3665] write(8, "16", 2)           = 2
[pid  3665] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3664] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   57.571753][ T3665] debugfs: out of free dentries, can not create file 'timeout'
[pid  3664] exit_group(0 <unfinished ...>
[pid  3666] <... futex resumed>)        = ?
[pid  3664] <... exit_group resumed>)   = ?
[pid  3666] +++ exited with 0 +++
[pid  3665] <... ioctl resumed>)        = ?
[   57.754101][ T3665] block nbd0: shutting down sockets
[pid  3665] +++ exited with 0 +++
[pid  3664] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3664, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3667
./strace-static-x86_64: Process 3667 attached
[pid  3667] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3667] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3667] setpgid(0, 0)               = 0
[pid  3667] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3667] write(3, "1000", 4)         = 4
[pid  3667] close(3)                    = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3667] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3667] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3667] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3668], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3668
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3668 attached
 <unfinished ...>
[pid  3668] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3668] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3667] <... futex resumed>)        = 0
[pid  3668] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3667] <... futex resumed>)        = 0
[pid  3668] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... ioctl resumed>)        = 0
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3668] <... futex resumed>)        = 1
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... openat resumed>)       = 4
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3668] <... futex resumed>)        = 1
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... socketpair resumed>[5, 6]) = 0
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3668] <... futex resumed>)        = 1
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3667] <... futex resumed>)        = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... ioctl resumed>)        = 0
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3667] <... futex resumed>)        = 0
[pid  3668] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3667] <... futex resumed>)        = 0
[pid  3668] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... openat resumed>)       = 7
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3667] <... futex resumed>)        = 0
[pid  3668] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3668] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3667] <... futex resumed>)        = 0
[pid  3668] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] <... ioctl resumed>)        = 0
[pid  3668] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3667] <... futex resumed>)        = 0
[pid  3667] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3667] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3668] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3668] write(8, "16", 2)           = 2
[pid  3668] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3667] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3667] exit_group(0)               = ?
[pid  3668] <... ioctl resumed>)        = ?
[pid  3668] +++ exited with 0 +++
[pid  3667] +++ exited with 0 +++
[   58.069212][ T3668] block nbd0: shutting down sockets
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3667, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3669 attached
, child_tidptr=0x5555560ae5d0) = 3669
[pid  3669] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3669] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3669] setpgid(0, 0)               = 0
[pid  3669] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3669] write(3, "1000", 4)         = 4
[pid  3669] close(3)                    = 0
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3669] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3669] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3669] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3670 attached
, parent_tid=[3670], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3670
[pid  3670] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3670] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3670] <... futex resumed>)        = 0
[pid  3670] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3670] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3670] <... futex resumed>)        = 0
[pid  3669] <... futex resumed>)        = 1
[pid  3670] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3670] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3670] <... futex resumed>)        = 0
[pid  3670] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3670] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3670] <... futex resumed>)        = 0
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3670] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3670] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3669] <... futex resumed>)        = 0
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3670] <... futex resumed>)        = 0
[pid  3669] <... futex resumed>)        = 1
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3670] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3669] <... futex resumed>)        = 0
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3670] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3669] <... futex resumed>)        = 0
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3670] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3670] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3669] <... futex resumed>)        = 0
[pid  3669] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3669] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3670] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3670] write(8, "16", 2)           = 2
[pid  3670] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3669] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   58.243027][ T3670] debugfs: out of free dentries, can not create file 'timeout'
[pid  3669] exit_group(0)               = ?
[pid  3670] <... ioctl resumed>)        = ?
[   58.421502][ T3670] block nbd0: shutting down sockets
[pid  3670] +++ exited with 0 +++
[pid  3669] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3669, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3671
./strace-static-x86_64: Process 3671 attached
[pid  3671] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3671] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3671] setpgid(0, 0)               = 0
[pid  3671] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3671] write(3, "1000", 4)         = 4
[pid  3671] close(3)                    = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3671] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3671] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3672], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3672
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3672 attached
 <unfinished ...>
[pid  3672] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3672] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3671] <... futex resumed>)        = 0
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... futex resumed>)        = 1
[pid  3672] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3671] <... futex resumed>)        = 0
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... futex resumed>)        = 1
[pid  3672] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3671] <... futex resumed>)        = 0
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... futex resumed>)        = 1
[pid  3672] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3671] <... futex resumed>)        = 0
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... futex resumed>)        = 1
[pid  3672] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3671] <... futex resumed>)        = 0
[pid  3672] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3672] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3671] <... futex resumed>)        = 0
[pid  3672] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... openat resumed>)       = 7
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3671] <... futex resumed>)        = 0
[pid  3672] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3672] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3671] <... futex resumed>)        = 0
[pid  3672] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... ioctl resumed>)        = 0
[pid  3672] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3671] <... futex resumed>)        = 0
[pid  3672] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3671] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3672] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3671] <... futex resumed>)        = 0
[pid  3672] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3671] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3672] <... openat resumed>)       = 8
[pid  3672] write(8, "16", 2)           = 2
[pid  3672] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3671] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3671] exit_group(0 <unfinished ...>
[pid  3672] <... ioctl resumed>)        = ?
[pid  3671] <... exit_group resumed>)   = ?
[pid  3672] +++ exited with 0 +++
[pid  3671] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3671, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3673
./strace-static-x86_64: Process 3673 attached
[pid  3673] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3673] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3673] setpgid(0, 0)               = 0
[pid  3673] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3673] write(3, "1000", 4)         = 4
[pid  3673] close(3)                    = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3673] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3673] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3674], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3674
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3674 attached
 <unfinished ...>
[pid  3674] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3674] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] <... futex resumed>)        = 1
[pid  3674] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] <... futex resumed>)        = 1
[pid  3674] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] <... futex resumed>)        = 1
[pid  3674] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] <... futex resumed>)        = 1
[   58.751417][ T3672] block nbd0: shutting down sockets
[pid  3674] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3673] <... futex resumed>)        = 0
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3674] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3673] <... futex resumed>)        = 0
[pid  3674] <... futex resumed>)        = 1
[pid  3673] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3674] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3674] write(8, "16", 2)           = 2
[pid  3674] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3673] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3673] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3673] exit_group(0 <unfinished ...>
[pid  3674] <... ioctl resumed>)        = ?
[pid  3673] <... exit_group resumed>)   = ?
[pid  3674] +++ exited with 0 +++
[pid  3673] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3673, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3675
./strace-static-x86_64: Process 3675 attached
[pid  3675] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3675] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3675] setpgid(0, 0)               = 0
[pid  3675] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3675] write(3, "1000", 4)         = 4
[pid  3675] close(3)                    = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3675] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3675] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3676], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3676
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3676 attached
 <unfinished ...>
[pid  3676] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3676] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] <... futex resumed>)        = 1
[pid  3676] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] <... futex resumed>)        = 1
[pid  3676] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] <... futex resumed>)        = 1
[pid  3676] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] <... futex resumed>)        = 1
[   59.060941][ T3674] block nbd0: shutting down sockets
[pid  3676] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3675] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3676] <... ioctl resumed>)        = 0
[pid  3675] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3676] <... futex resumed>)        = 0
[pid  3675] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0 <unfinished ...>
[pid  3676] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3675] <... mmap resumed>)         = 0x7f1d426d1000
[pid  3675] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3675] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3677 attached
 <unfinished ...>
[pid  3677] set_robust_list(0x7f1d426f19e0, 24 <unfinished ...>
[pid  3675] <... clone resumed>, parent_tid=[3677], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3677
[pid  3677] <... set_robust_list resumed>) = 0
[pid  3675] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3677] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3675] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3677] <... openat resumed>)       = 7
[pid  3677] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3675] <... futex resumed>)        = 0
[pid  3677] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3676] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3676] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3676] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3675] <... futex resumed>)        = 0
[pid  3675] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3676] <... futex resumed>)        = 0
[pid  3675] <... futex resumed>)        = 1
[pid  3676] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3675] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3676] write(8, "16", 2)           = 2
[pid  3676] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3675] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   59.182511][ T3676] debugfs: out of free dentries, can not create file 'timeout'
[pid  3675] exit_group(0)               = ?
[pid  3677] <... futex resumed>)        = ?
[pid  3676] <... ioctl resumed>)        = ?
[pid  3677] +++ exited with 0 +++
[   59.363960][ T3676] block nbd0: shutting down sockets
[pid  3676] +++ exited with 0 +++
[pid  3675] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3675, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3678 attached
, child_tidptr=0x5555560ae5d0) = 3678
[pid  3678] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3678] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3678] setpgid(0, 0)               = 0
[pid  3678] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3678] write(3, "1000", 4)         = 4
[pid  3678] close(3)                    = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3678] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3678] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3679], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3679
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3679 attached
 <unfinished ...>
[pid  3679] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3679] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3678] <... futex resumed>)        = 0
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... futex resumed>)        = 1
[pid  3679] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3678] <... futex resumed>)        = 0
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... futex resumed>)        = 1
[pid  3679] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3678] <... futex resumed>)        = 0
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... futex resumed>)        = 1
[pid  3679] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3678] <... futex resumed>)        = 0
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... futex resumed>)        = 1
[pid  3679] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3678] <... futex resumed>)        = 0
[pid  3679] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3679] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3678] <... futex resumed>)        = 0
[pid  3679] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... openat resumed>)       = 7
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3678] <... futex resumed>)        = 0
[pid  3679] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3679] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3678] <... futex resumed>)        = 0
[pid  3679] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] <... ioctl resumed>)        = 0
[pid  3679] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3678] <... futex resumed>)        = 0
[pid  3678] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3678] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3679] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3679] write(8, "16", 2)           = 2
[pid  3679] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3678] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3678] exit_group(0)               = ?
[pid  3679] <... ioctl resumed>)        = ?
[   59.691632][ T3679] block nbd0: shutting down sockets
[pid  3679] +++ exited with 0 +++
[pid  3678] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3678, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3680
./strace-static-x86_64: Process 3680 attached
[pid  3680] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3680] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3680] setpgid(0, 0)               = 0
[pid  3680] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3680] write(3, "1000", 4)         = 4
[pid  3680] close(3)                    = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3680] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3680] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3681], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3681
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3681 attached
 <unfinished ...>
[pid  3681] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3681] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3680] <... futex resumed>)        = 0
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... futex resumed>)        = 1
[pid  3681] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3680] <... futex resumed>)        = 0
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... futex resumed>)        = 1
[pid  3681] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3680] <... futex resumed>)        = 0
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... futex resumed>)        = 1
[pid  3681] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3680] <... futex resumed>)        = 0
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... futex resumed>)        = 1
[pid  3681] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3680] <... futex resumed>)        = 0
[pid  3681] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3681] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3680] <... futex resumed>)        = 0
[pid  3681] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... openat resumed>)       = 7
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3680] <... futex resumed>)        = 0
[pid  3681] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3681] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3680] <... futex resumed>)        = 0
[pid  3681] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... ioctl resumed>)        = 0
[pid  3681] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3680] <... futex resumed>)        = 0
[pid  3681] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3680] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3681] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3680] <... futex resumed>)        = 0
[pid  3681] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3680] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3681] <... openat resumed>)       = 8
[pid  3681] write(8, "16", 2)           = 2
[pid  3681] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3680] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   59.849166][ T3681] debugfs: out of free dentries, can not create file 'timeout'
[pid  3680] exit_group(0)               = ?
[pid  3681] <... ioctl resumed>)        = ?
[pid  3681] +++ exited with 0 +++
[pid  3680] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3680, si_uid=0, si_status=0, si_utime=0, si_stime=4} ---
[   60.030682][ T3681] block nbd0: shutting down sockets
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3682
./strace-static-x86_64: Process 3682 attached
[pid  3682] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3682] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3682] setpgid(0, 0)               = 0
[pid  3682] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3682] write(3, "1000", 4)         = 4
[pid  3682] close(3)                    = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3682] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3682] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3683], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3683
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3683 attached
 <unfinished ...>
[pid  3683] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3683] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3682] <... futex resumed>)        = 0
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... futex resumed>)        = 1
[pid  3683] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3682] <... futex resumed>)        = 0
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... futex resumed>)        = 1
[pid  3683] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3682] <... futex resumed>)        = 0
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... futex resumed>)        = 1
[pid  3683] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3682] <... futex resumed>)        = 0
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... futex resumed>)        = 1
[pid  3683] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3682] <... futex resumed>)        = 0
[pid  3683] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3683] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3682] <... futex resumed>)        = 0
[pid  3683] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... openat resumed>)       = 7
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3682] <... futex resumed>)        = 0
[pid  3683] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3683] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3682] <... futex resumed>)        = 0
[pid  3683] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... ioctl resumed>)        = 0
[pid  3683] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3682] <... futex resumed>)        = 0
[pid  3683] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3682] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3683] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3682] <... futex resumed>)        = 0
[pid  3683] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3682] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3683] <... openat resumed>)       = 8
[pid  3683] write(8, "16", 2)           = 2
[pid  3683] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3682] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3682] exit_group(0)               = ?
[pid  3683] <... ioctl resumed>)        = ?
[pid  3683] +++ exited with 0 +++
[pid  3682] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3682, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3684
[   60.371090][ T3683] block nbd0: shutting down sockets
./strace-static-x86_64: Process 3684 attached
[pid  3684] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3684] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3684] setpgid(0, 0)               = 0
[pid  3684] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3684] write(3, "1000", 4)         = 4
[pid  3684] close(3)                    = 0
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3684] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3684] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3684] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3685 attached
, parent_tid=[3685], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3685
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] set_robust_list(0x7f1d427129e0, 24 <unfinished ...>
[pid  3684] <... futex resumed>)        = 0
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] <... set_robust_list resumed>) = 0
[pid  3685] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3684] <... futex resumed>)        = 0
[pid  3685] <... futex resumed>)        = 1
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3684] <... futex resumed>)        = 0
[pid  3685] <... futex resumed>)        = 1
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3684] <... futex resumed>)        = 0
[pid  3685] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] <... socketpair resumed>[5, 6]) = 0
[pid  3684] <... futex resumed>)        = 0
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3684] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] <... futex resumed>)        = 0
[pid  3684] <... futex resumed>)        = 1
[pid  3685] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] <... ioctl resumed>)        = 0
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3685] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3684] <... futex resumed>)        = 0
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] <... futex resumed>)        = 0
[pid  3684] <... futex resumed>)        = 1
[pid  3685] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] <... futex resumed>)        = 0
[pid  3685] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3684] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] <... futex resumed>)        = 0
[pid  3684] <... futex resumed>)        = 1
[pid  3685] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] <... ioctl resumed>)        = 0
[pid  3685] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3685] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3684] <... futex resumed>)        = 0
[pid  3684] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3685] <... futex resumed>)        = 0
[pid  3684] <... futex resumed>)        = 1
[pid  3685] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3685] write(8, "16", 2 <unfinished ...>
[pid  3684] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3685] <... write resumed>)        = 2
[pid  3685] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3684] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3684] exit_group(0)               = ?
[pid  3685] <... ioctl resumed>)        = ?
[   60.694610][ T3685] block nbd0: shutting down sockets
[pid  3685] +++ exited with 0 +++
[pid  3684] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3684, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3686 attached
, child_tidptr=0x5555560ae5d0) = 3686
[pid  3686] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3686] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3686] setpgid(0, 0)               = 0
[pid  3686] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3686] write(3, "1000", 4)         = 4
[pid  3686] close(3)                    = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3686] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3686] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3687 attached
, parent_tid=[3687], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3687
[pid  3687] set_robust_list(0x7f1d427129e0, 24 <unfinished ...>
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] <... set_robust_list resumed>) = 0
[pid  3687] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3687] <... futex resumed>)        = 1
[pid  3686] <... futex resumed>)        = 0
[pid  3687] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] <... ioctl resumed>)        = 0
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3687] <... futex resumed>)        = 1
[pid  3686] <... futex resumed>)        = 0
[pid  3687] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] <... openat resumed>)       = 4
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3687] <... futex resumed>)        = 1
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3687] <... futex resumed>)        = 1
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3687] <... futex resumed>)        = 1
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3687] <... futex resumed>)        = 1
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3687] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3687] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3686] <... futex resumed>)        = 0
[pid  3686] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3687] <... futex resumed>)        = 0
[pid  3687] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3686] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3687] <... openat resumed>)       = 8
[pid  3687] write(8, "16", 2)           = 2
[pid  3687] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3686] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   60.853566][ T3687] debugfs: out of free dentries, can not create file 'timeout'
[pid  3686] exit_group(0 <unfinished ...>
[pid  3687] <... ioctl resumed>)        = ?
[pid  3686] <... exit_group resumed>)   = ?
[pid  3687] +++ exited with 0 +++
[   61.032520][ T3687] block nbd0: shutting down sockets
[pid  3686] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3686, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3688
./strace-static-x86_64: Process 3688 attached
[pid  3688] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3688] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3688] setpgid(0, 0)               = 0
[pid  3688] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3688] write(3, "1000", 4)         = 4
[pid  3688] close(3)                    = 0
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3688] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3688] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3688] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3689], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3689
./strace-static-x86_64: Process 3689 attached
[pid  3689] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = 0
[pid  3688] <... futex resumed>)        = 1
[pid  3689] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = 0
[pid  3688] <... futex resumed>)        = 1
[pid  3689] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3689] <... futex resumed>)        = 0
[pid  3689] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = 0
[pid  3688] <... futex resumed>)        = 1
[pid  3689] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = 0
[pid  3688] <... futex resumed>)        = 1
[pid  3689] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out)
[pid  3688] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3688] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3688] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3688] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3690 attached
 <unfinished ...>
[pid  3690] set_robust_list(0x7f1d426f19e0, 24 <unfinished ...>
[pid  3688] <... clone resumed>, parent_tid=[3690], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3690
[pid  3690] <... set_robust_list resumed>) = 0
[pid  3688] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3690] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3688] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3690] <... openat resumed>)       = 7
[pid  3690] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... ioctl resumed>)        = 0
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3690] <... futex resumed>)        = 1
[pid  3688] <... futex resumed>)        = 0
[pid  3690] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = 0
[pid  3688] <... futex resumed>)        = 1
[pid  3689] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3689] <... ioctl resumed>)        = 0
[pid  3689] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3688] <... futex resumed>)        = 0
[pid  3689] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3688] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3689] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3688] <... futex resumed>)        = 0
[pid  3689] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3688] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3689] <... openat resumed>)       = 8
[pid  3689] write(8, "16", 2)           = 2
[pid  3689] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3688] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   61.225708][ T3689] debugfs: out of free dentries, can not create file 'timeout'
[pid  3688] exit_group(0 <unfinished ...>
[pid  3690] <... futex resumed>)        = ?
[pid  3689] <... ioctl resumed>)        = ?
[pid  3688] <... exit_group resumed>)   = ?
[pid  3690] +++ exited with 0 +++
[   61.404564][ T3689] block nbd0: shutting down sockets
[pid  3689] +++ exited with 0 +++
[pid  3688] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3688, si_uid=0, si_status=0, si_utime=1, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3691
./strace-static-x86_64: Process 3691 attached
[pid  3691] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3691] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3691] setpgid(0, 0)               = 0
[pid  3691] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3691] write(3, "1000", 4)         = 4
[pid  3691] close(3)                    = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3691] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3691] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3692 attached
, parent_tid=[3692], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3692
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3692] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3691] <... futex resumed>)        = 0
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... futex resumed>)        = 1
[pid  3692] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3691] <... futex resumed>)        = 0
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... futex resumed>)        = 1
[pid  3692] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3691] <... futex resumed>)        = 0
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... futex resumed>)        = 1
[pid  3692] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3691] <... futex resumed>)        = 0
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... futex resumed>)        = 1
[pid  3692] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3691] <... futex resumed>)        = 0
[pid  3692] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3692] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3691] <... futex resumed>)        = 0
[pid  3692] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... openat resumed>)       = 7
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3691] <... futex resumed>)        = 0
[pid  3692] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3692] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3691] <... futex resumed>)        = 0
[pid  3692] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] <... ioctl resumed>)        = 0
[pid  3692] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3691] <... futex resumed>)        = 0
[pid  3691] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3691] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3692] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3692] write(8, "16", 2)           = 2
[pid  3692] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3691] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3691] exit_group(0 <unfinished ...>
[pid  3692] <... ioctl resumed>)        = ?
[pid  3691] <... exit_group resumed>)   = ?
[pid  3692] +++ exited with 0 +++
[pid  3691] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3691, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3693
./strace-static-x86_64: Process 3693 attached
[pid  3693] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3693] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3693] setpgid(0, 0)               = 0
[pid  3693] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3693] write(3, "1000", 4)         = 4
[pid  3693] close(3)                    = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3693] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3693] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3694], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3694
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3694 attached
 <unfinished ...>
[pid  3694] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3694] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3693] <... futex resumed>)        = 0
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... futex resumed>)        = 1
[pid  3694] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3693] <... futex resumed>)        = 0
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... futex resumed>)        = 1
[pid  3694] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3693] <... futex resumed>)        = 0
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... futex resumed>)        = 1
[pid  3694] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3693] <... futex resumed>)        = 0
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... futex resumed>)        = 1
[   61.739804][ T3692] block nbd0: shutting down sockets
[pid  3694] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3693] <... futex resumed>)        = 0
[pid  3694] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3694] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3693] <... futex resumed>)        = 0
[pid  3694] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... openat resumed>)       = 7
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3693] <... futex resumed>)        = 0
[pid  3694] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3694] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3693] <... futex resumed>)        = 0
[pid  3694] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... ioctl resumed>)        = 0
[pid  3694] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3693] <... futex resumed>)        = 0
[pid  3694] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3693] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3694] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3693] <... futex resumed>)        = 0
[pid  3694] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3693] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3694] <... openat resumed>)       = 8
[pid  3694] write(8, "16", 2)           = 2
[pid  3694] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3693] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   61.841054][ T3694] debugfs: out of free dentries, can not create file 'timeout'
[pid  3693] exit_group(0 <unfinished ...>
[pid  3694] <... ioctl resumed>)        = ?
[pid  3693] <... exit_group resumed>)   = ?
[   62.021010][ T3694] block nbd0: shutting down sockets
[pid  3694] +++ exited with 0 +++
[pid  3693] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3693, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3695
./strace-static-x86_64: Process 3695 attached
[pid  3695] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3695] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3695] setpgid(0, 0)               = 0
[pid  3695] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3695] write(3, "1000", 4)         = 4
[pid  3695] close(3)                    = 0
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3695] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3695] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3695] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3696], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3696
./strace-static-x86_64: Process 3696 attached
[pid  3696] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3696] <... futex resumed>)        = 0
[pid  3696] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3696] <... openat resumed>)       = 3
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] <... futex resumed>)        = 0
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3696] <... futex resumed>)        = 0
[pid  3696] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3696] <... futex resumed>)        = 0
[pid  3696] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3696] <... futex resumed>)        = 0
[pid  3695] <... futex resumed>)        = 1
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3696] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3695] <... futex resumed>)        = 0
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3696] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3695] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3695] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3695] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3695] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3695] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID <unfinished ...>
[pid  3696] <... ioctl resumed>)        = 0
[pid  3695] <... clone resumed>, parent_tid=[3697], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3697
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3696] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL./strace-static-x86_64: Process 3697 attached
 <unfinished ...>
[pid  3697] set_robust_list(0x7f1d426f19e0, 24) = 0
[pid  3697] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3697] <... futex resumed>)        = 0
[pid  3695] <... futex resumed>)        = 1
[pid  3695] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3697] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3697] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3695] <... futex resumed>)        = 0
[pid  3697] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3696] <... futex resumed>)        = 0
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3696] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3696] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3695] <... futex resumed>)        = 0
[pid  3696] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3695] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3696] <... openat resumed>)       = 8
[pid  3695] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3696] write(8, "16", 2)           = 2
[pid  3696] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3695] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3695] exit_group(0 <unfinished ...>
[pid  3697] <... futex resumed>)        = ?
[pid  3697] +++ exited with 0 +++
[pid  3695] <... exit_group resumed>)   = ?
[pid  3696] <... ioctl resumed>)        = ?
[   62.374186][ T3696] block nbd0: shutting down sockets
[pid  3696] +++ exited with 0 +++
[pid  3695] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3695, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3698
./strace-static-x86_64: Process 3698 attached
[pid  3698] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3698] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3698] setpgid(0, 0)               = 0
[pid  3698] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3698] write(3, "1000", 4)         = 4
[pid  3698] close(3)                    = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3698] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3698] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3699], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3699
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3699 attached
 <unfinished ...>
[pid  3699] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3699] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3698] <... futex resumed>)        = 0
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... futex resumed>)        = 1
[pid  3699] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3698] <... futex resumed>)        = 0
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... futex resumed>)        = 1
[pid  3699] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3698] <... futex resumed>)        = 0
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... futex resumed>)        = 1
[pid  3699] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3698] <... futex resumed>)        = 0
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... futex resumed>)        = 1
[pid  3699] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3698] <... futex resumed>)        = 0
[pid  3699] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3699] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3698] <... futex resumed>)        = 0
[pid  3699] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... openat resumed>)       = 7
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3698] <... futex resumed>)        = 0
[pid  3699] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3699] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3698] <... futex resumed>)        = 0
[pid  3699] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... ioctl resumed>)        = 0
[pid  3699] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3698] <... futex resumed>)        = 0
[pid  3699] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3698] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3699] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3698] <... futex resumed>)        = 0
[pid  3699] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3698] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3699] <... openat resumed>)       = 8
[pid  3699] write(8, "16", 2)           = 2
[pid  3699] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3698] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3698] exit_group(0)               = ?
[pid  3699] <... ioctl resumed>)        = ?
[   62.700976][ T3699] block nbd0: shutting down sockets
[pid  3699] +++ exited with 0 +++
[pid  3698] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3698, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3700
./strace-static-x86_64: Process 3700 attached
[pid  3700] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3700] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3700] setpgid(0, 0)               = 0
[pid  3700] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3700] write(3, "1000", 4)         = 4
[pid  3700] close(3)                    = 0
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3700] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3700] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3700] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3701 attached
, parent_tid=[3701], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3701
[pid  3701] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3701] <... futex resumed>)        = 0
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3701] <... futex resumed>)        = 0
[pid  3701] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE <unfinished ...>
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] <... ioctl resumed>)        = 0
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3701] <... futex resumed>)        = 0
[pid  3701] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3701] <... futex resumed>)        = 0
[pid  3701] socketpair(AF_UNIX, SOCK_STREAM, 0,  <unfinished ...>
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] <... socketpair resumed>[5, 6]) = 0
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3700] <... futex resumed>)        = 0
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3700] <... futex resumed>)        = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3701] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3700] <... futex resumed>)        = 0
[pid  3701] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3700] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3701] <... futex resumed>)        = 0
[pid  3700] <... futex resumed>)        = 1
[pid  3701] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] <... ioctl resumed>)        = 0
[pid  3701] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3700] <... futex resumed>)        = 0
[pid  3701] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3700] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3701] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3700] <... futex resumed>)        = 0
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3701] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3701] write(8, "16", 2)           = 2
[pid  3701] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3700] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3700] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[   62.871260][ T3701] debugfs: out of free dentries, can not create file 'timeout'
[pid  3700] exit_group(0)               = ?
[pid  3701] <... ioctl resumed>)        = ?
[pid  3701] +++ exited with 0 +++
[pid  3700] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3700, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3702
./strace-static-x86_64: Process 3702 attached
[   63.050968][ T3701] block nbd0: shutting down sockets
[pid  3702] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3702] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3702] setpgid(0, 0)               = 0
[pid  3702] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3702] write(3, "1000", 4)         = 4
[pid  3702] close(3)                    = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3702] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3702] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3703], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3703
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3703 attached
 <unfinished ...>
[pid  3703] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3703] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3702] <... futex resumed>)        = 0
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... futex resumed>)        = 1
[pid  3703] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3702] <... futex resumed>)        = 0
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... futex resumed>)        = 1
[pid  3703] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3702] <... futex resumed>)        = 0
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... futex resumed>)        = 1
[pid  3703] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3702] <... futex resumed>)        = 0
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... futex resumed>)        = 1
[pid  3703] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3702] <... futex resumed>)        = 0
[pid  3703] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... openat resumed>)       = 7
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3702] <... futex resumed>)        = 0
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3703] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3702] <... futex resumed>)        = 0
[pid  3703] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3702] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3703] <... openat resumed>)       = 8
[pid  3702] <... futex resumed>)        = 0
[pid  3703] write(8, "16", 2 <unfinished ...>
[pid  3702] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3703] <... write resumed>)        = 2
[pid  3703] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3702] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   63.192795][ T3703] debugfs: out of free dentries, can not create file 'timeout'
[pid  3702] exit_group(0)               = ?
[pid  3703] <... ioctl resumed>)        = ?
[   63.372880][ T3703] block nbd0: shutting down sockets
[pid  3703] +++ exited with 0 +++
[pid  3702] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3702, si_uid=0, si_status=0, si_utime=0, si_stime=3} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3704 attached
, child_tidptr=0x5555560ae5d0) = 3704
[pid  3704] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3704] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3704] setpgid(0, 0)               = 0
[pid  3704] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3704] write(3, "1000", 4)         = 4
[pid  3704] close(3)                    = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3704] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3704] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID./strace-static-x86_64: Process 3705 attached
, parent_tid=[3705], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3705
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3705] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] <... futex resumed>)        = 1
[pid  3705] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3704] <... futex resumed>)        = 0
[pid  3705] <... futex resumed>)        = 1
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3705] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3704] <... futex resumed>)        = 0
[pid  3704] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3704] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3705] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 8
[pid  3705] write(8, "16", 2)           = 2
[pid  3705] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3704] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3704] exit_group(0)               = ?
[pid  3705] <... ioctl resumed>)        = ?
[   63.708148][ T3705] block nbd0: shutting down sockets
[pid  3705] +++ exited with 0 +++
[pid  3704] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3704, si_uid=0, si_status=0, si_utime=0, si_stime=2} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x5555560ae5d0) = 3706
./strace-static-x86_64: Process 3706 attached
[pid  3706] set_robust_list(0x5555560ae5e0, 24) = 0
[pid  3706] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3706] setpgid(0, 0)               = 0
[pid  3706] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3706] write(3, "1000", 4)         = 4
[pid  3706] close(3)                    = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426f2000
[pid  3706] mprotect(0x7f1d426f3000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3706] clone(child_stack=0x7f1d427123f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3707], tls=0x7f1d42712700, child_tidptr=0x7f1d427129d0) = 3707
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3707 attached
 <unfinished ...>
[pid  3707] set_robust_list(0x7f1d427129e0, 24) = 0
[pid  3707] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3707] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3707] <... futex resumed>)        = 1
[pid  3707] ioctl(3, NBD_SET_FLAGS, NBD_FLAG_HAS_FLAGS|NBD_FLAG_READ_ONLY|NBD_FLAG_SEND_FLUSH|NBD_FLAG_SEND_FUA|NBD_FLAG_ROTATIONAL|NBD_FLAG_SEND_TRIM|NBD_FLAG_SEND_WRITE_ZEROES|NBD_FLAG_SEND_DF|NBD_FLAG_CAN_MULTI_CONN|NBD_FLAG_SEND_RESIZE) = 0
[pid  3707] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3707] <... futex resumed>)        = 1
[pid  3707] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3707] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3707] <... futex resumed>)        = 1
[pid  3707] socketpair(AF_UNIX, SOCK_STREAM, 0, [5, 6]) = 0
[pid  3707] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3707] <... futex resumed>)        = 1
[pid  3707] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3706] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3706] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f1d426d1000
[pid  3706] mprotect(0x7f1d426d2000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3706] clone(child_stack=0x7f1d426f13f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3708], tls=0x7f1d426f1700, child_tidptr=0x7f1d426f19d0) = 3708
[pid  3706] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3708 attached
 <unfinished ...>
[pid  3708] set_robust_list(0x7f1d426f19e0, 24) = 0
[pid  3708] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 7
[pid  3708] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3706] futex(0x7f1d427e94fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3708] <... futex resumed>)        = 1
[pid  3708] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3707] <... ioctl resumed>)        = 0
[pid  3707] futex(0x7f1d427e94ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3707] futex(0x7f1d427e94e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3708] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3708] futex(0x7f1d427e94fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3706] <... futex resumed>)        = 0
[pid  3706] futex(0x7f1d427e94e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3707] <... futex resumed>)        = 0
[pid  3706] <... futex resumed>)        = 1
[pid  3707] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3706] futex(0x7f1d427e94ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3707] <... openat resumed>)       = 8
[pid  3707] write(8, "16", 2)           = 2
[pid  3707] ioctl(7, NBD_DO_IT <unfinished ...>
[pid  3708] <... futex resumed>)        = 1
[   63.858406][ T3708] block nbd0: Device being setup by another task
[pid  3708] futex(0x7f1d427e94f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3706] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   63.901390][ T3707] ------------[ cut here ]------------
[   63.906866][ T3707] kernfs: can not remove 'nr_tags', no directory
[   63.913617][ T3707] WARNING: CPU: 1 PID: 3707 at fs/kernfs/dir.c:1577 kernfs_remove_by_name_ns+0xb0/0xe0
[   63.923586][ T3707] Modules linked in:
[   63.927519][ T3707] CPU: 1 PID: 3707 Comm: syz-executor298 Not tainted 5.19.0-rc4-syzkaller #0
[   63.937142][ T3707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   63.947959][ T3707] RIP: 0010:kernfs_remove_by_name_ns+0xb0/0xe0
[   63.954565][ T3707] Code: 48 89 c3 e8 e2 54 6f ff 48 89 df e8 da e5 ff ff 31 db eb 29 e8 d1 54 6f ff 48 c7 c7 00 ca 9f 8a 4c 89 fe 31 c0 e8 c0 e9 37 ff <0f> 0b bb fe ff ff ff eb 12 e8 b2 54 6f ff bb fe ff ff ff 4c 89 e7
[   63.974294][ T3707] RSP: 0018:ffffc9000325f9a8 EFLAGS: 00010246
[   63.980588][ T3707] RAX: 7e17a5d5f68b2700 RBX: ffffffff8d1419a0 RCX: ffff88801e5d5880
[   63.988642][ T3707] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[   63.996727][ T3707] RBP: dffffc0000000000 R08: ffffffff816bcd1d R09: ffffed10173667e9
[   64.004760][ T3707] R10: ffffed10173667e9 R11: 1ffff110173667e8 R12: ffffffff8d141968
[   64.012821][ T3707] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8ae7d8c0
[   64.020920][ T3707] FS:  00007f1d42712700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
[   64.029954][ T3707] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   64.036551][ T3707] CR2: 00007f1d427a64c0 CR3: 000000007004e000 CR4: 00000000003506f0
[pid  3706] exit_group(0 <unfinished ...>
[pid  3708] <... futex resumed>)        = ?
[pid  3706] <... exit_group resumed>)   = ?
[pid  3708] +++ exited with 0 +++
[   64.044587][ T3707] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   64.052617][ T3707] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   64.060672][ T3707] Call Trace:
[   64.063976][ T3707]  <TASK>
[   64.066935][ T3707]  sysfs_remove_group+0x102/0x2b0
[   64.072076][ T3707]  sysfs_remove_groups+0x5b/0xb0
[   64.077037][ T3707]  __kobject_del+0x84/0x300
[   64.081637][ T3707]  kobject_del+0x41/0x60
[   64.085906][ T3707]  blk_mq_sysfs_unregister+0x235/0x320
[   64.091649][ T3707]  ? __blk_mq_register_dev+0x910/0x910
[   64.097121][ T3707]  ? elevator_switch_mq+0x583/0x6d0
[   64.102387][ T3707]  blk_mq_update_nr_hw_queues+0x647/0x12d0
[   64.108238][ T3707]  ? blk_mq_update_nr_requests+0x500/0x500
[   64.114131][ T3707]  ? blkdev_common_ioctl+0x6d6/0x2390
[   64.119545][ T3707]  ? mutex_lock_io_nested+0x60/0x60
[   64.124762][ T3707]  nbd_start_device+0x15d/0xb70
[   64.129678][ T3707]  ? bpf_lsm_capable+0x5/0x10
[   64.134379][ T3707]  ? security_capable+0xb1/0xd0
[   64.139352][ T3707]  nbd_ioctl+0x3b3/0xa40
[   64.143620][ T3707]  ? nbd_release+0x130/0x130
[   64.148204][ T3707]  ? memset+0x1f/0x40
[   64.152264][ T3707]  ? smack_file_ioctl+0x298/0x3a0
[   64.157301][ T3707]  ? smack_file_alloc_security+0xd0/0xd0
[   64.162975][ T3707]  ? nbd_release+0x130/0x130
[   64.167598][ T3707]  blkdev_ioctl+0x3a6/0x760
[   64.172165][ T3707]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   64.177659][ T3707]  ? bpf_lsm_file_ioctl+0x5/0x10
[   64.182644][ T3707]  ? security_file_ioctl+0x9d/0xb0
[   64.187765][ T3707]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   64.193360][ T3707]  __se_sys_ioctl+0xfb/0x170
[   64.197976][ T3707]  do_syscall_64+0x2b/0x70
[   64.202476][ T3707]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   64.208453][ T3707] RIP: 0033:0x7f1d42765319
[   64.212891][ T3707] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   64.232565][ T3707] RSP: 002b:00007f1d427122e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   64.241013][ T3707] RAX: ffffffffffffffda RBX: 00007f1d427e94e0 RCX: 00007f1d42765319
[   64.249051][ T3707] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
[   64.257033][ T3707] RBP: 00007f1d427b6194 R08: 0000000000000002 R09: 0000000000003631
[   64.265057][ T3707] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1d427e94ec
[   64.273090][ T3707] R13: 00007f1d427122f0 R14: 00007f1d427e94e8 R15: 0000000000000002
[   64.281136][ T3707]  </TASK>
[   64.284164][ T3707] Kernel panic - not syncing: panic_on_warn set ...
[   64.290740][ T3707] CPU: 0 PID: 3707 Comm: syz-executor298 Not tainted 5.19.0-rc4-syzkaller #0
[   64.299487][ T3707] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   64.309538][ T3707] Call Trace:
[   64.312818][ T3707]  <TASK>
[   64.315738][ T3707]  dump_stack_lvl+0x1e3/0x2cb
[   64.320413][ T3707]  ? bfq_pos_tree_add_move+0x436/0x436
[   64.325869][ T3707]  ? panic+0x76e/0x76e
[   64.329948][ T3707]  ? vscnprintf+0x59/0x80
[   64.334265][ T3707]  ? kernfs_remove_self+0x650/0x660
[   64.339475][ T3707]  panic+0x312/0x76e
[   64.343372][ T3707]  ? __warn+0x131/0x220
[   64.347526][ T3707]  ? fb_is_primary_device+0xcc/0xcc
[   64.352729][ T3707]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   64.358271][ T3707]  __warn+0x1fa/0x220
[   64.362247][ T3707]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   64.367791][ T3707]  report_bug+0x1b3/0x2d0
[   64.372124][ T3707]  handle_bug+0x3d/0x70
[   64.376274][ T3707]  exc_invalid_op+0x16/0x40
[   64.380769][ T3707]  asm_exc_invalid_op+0x1b/0x20
[   64.385611][ T3707] RIP: 0010:kernfs_remove_by_name_ns+0xb0/0xe0
[   64.391761][ T3707] Code: 48 89 c3 e8 e2 54 6f ff 48 89 df e8 da e5 ff ff 31 db eb 29 e8 d1 54 6f ff 48 c7 c7 00 ca 9f 8a 4c 89 fe 31 c0 e8 c0 e9 37 ff <0f> 0b bb fe ff ff ff eb 12 e8 b2 54 6f ff bb fe ff ff ff 4c 89 e7
[   64.411360][ T3707] RSP: 0018:ffffc9000325f9a8 EFLAGS: 00010246
[   64.417429][ T3707] RAX: 7e17a5d5f68b2700 RBX: ffffffff8d1419a0 RCX: ffff88801e5d5880
[   64.425398][ T3707] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[   64.433359][ T3707] RBP: dffffc0000000000 R08: ffffffff816bcd1d R09: ffffed10173667e9
[   64.441324][ T3707] R10: ffffed10173667e9 R11: 1ffff110173667e8 R12: ffffffff8d141968
[   64.449286][ T3707] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8ae7d8c0
[   64.457258][ T3707]  ? __wake_up_klogd+0xcd/0x100
[   64.462112][ T3707]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   64.467651][ T3707]  sysfs_remove_group+0x102/0x2b0
[   64.472678][ T3707]  sysfs_remove_groups+0x5b/0xb0
[   64.477608][ T3707]  __kobject_del+0x84/0x300
[   64.482111][ T3707]  kobject_del+0x41/0x60
[   64.486346][ T3707]  blk_mq_sysfs_unregister+0x235/0x320
[   64.491803][ T3707]  ? __blk_mq_register_dev+0x910/0x910
[   64.497261][ T3707]  ? elevator_switch_mq+0x583/0x6d0
[   64.502458][ T3707]  blk_mq_update_nr_hw_queues+0x647/0x12d0
[   64.508265][ T3707]  ? blk_mq_update_nr_requests+0x500/0x500
[   64.514065][ T3707]  ? blkdev_common_ioctl+0x6d6/0x2390
[   64.519435][ T3707]  ? mutex_lock_io_nested+0x60/0x60
[   64.524632][ T3707]  nbd_start_device+0x15d/0xb70
[   64.529477][ T3707]  ? bpf_lsm_capable+0x5/0x10
[   64.534147][ T3707]  ? security_capable+0xb1/0xd0
[   64.538997][ T3707]  nbd_ioctl+0x3b3/0xa40
[   64.543238][ T3707]  ? nbd_release+0x130/0x130
[   64.547821][ T3707]  ? memset+0x1f/0x40
[   64.551791][ T3707]  ? smack_file_ioctl+0x298/0x3a0
[   64.556811][ T3707]  ? smack_file_alloc_security+0xd0/0xd0
[   64.562436][ T3707]  ? nbd_release+0x130/0x130
[   64.567019][ T3707]  blkdev_ioctl+0x3a6/0x760
[   64.571518][ T3707]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   64.576974][ T3707]  ? bpf_lsm_file_ioctl+0x5/0x10
[   64.581901][ T3707]  ? security_file_ioctl+0x9d/0xb0
[   64.587008][ T3707]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   64.592457][ T3707]  __se_sys_ioctl+0xfb/0x170
[   64.597044][ T3707]  do_syscall_64+0x2b/0x70
[   64.601453][ T3707]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   64.607336][ T3707] RIP: 0033:0x7f1d42765319
[   64.611753][ T3707] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
[   64.631348][ T3707] RSP: 002b:00007f1d427122e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   64.639758][ T3707] RAX: ffffffffffffffda RBX: 00007f1d427e94e0 RCX: 00007f1d42765319
[   64.647722][ T3707] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007
[   64.655684][ T3707] RBP: 00007f1d427b6194 R08: 0000000000000002 R09: 0000000000003631
[   64.663662][ T3707] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1d427e94ec
[   64.671623][ T3707] R13: 00007f1d427122f0 R14: 00007f1d427e94e8 R15: 0000000000000002
[   64.679600][ T3707]  </TASK>
[   64.682885][ T3707] Kernel Offset: disabled
[   64.687280][ T3707] Rebooting in 86400 seconds..