./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor2044900081

<...>
Warning: Permanently added '10.128.1.4' (ECDSA) to the list of known hosts.
execve("./syz-executor2044900081", ["./syz-executor2044900081"], 0x7fffdea2eb90 /* 10 vars */) = 0
brk(NULL)                               = 0x555555e5b000
brk(0x555555e5bc40)                     = 0x555555e5bc40
arch_prctl(ARCH_SET_FS, 0x555555e5b300) = 0
uname({sysname="Linux", nodename="syzkaller", ...}) = 0
set_tid_address(0x555555e5b5d0)         = 3601
set_robust_list(0x555555e5b5e0, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f21afd813c0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f21afd81a90}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f21afd81460, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f21afd81a90}, 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-executor2044900081", 4096) = 28
brk(0x555555e7cc40)                     = 0x555555e7cc40
brk(0x555555e7d000)                     = 0x555555e7d000
mprotect(0x7f21afe42000, 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 3602 attached
, child_tidptr=0x555555e5b5d0) = 3602
[pid  3602] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3602] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3602] setpgid(0, 0)               = 0
[pid  3602] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3602] write(3, "1000", 4)         = 4
[pid  3602] close(3)                    = 0
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3602] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3602] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3602] clone(child_stack=0x7f21afd713f0, 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 3603 attached
 <unfinished ...>
[pid  3603] set_robust_list(0x7f21afd719e0, 24 <unfinished ...>
[pid  3602] <... clone resumed>, parent_tid=[3603], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3603
[pid  3603] <... set_robust_list resumed>) = 0
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3602] <... futex resumed>)        = 0
[pid  3603] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] <... openat resumed>)       = 3
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3602] <... futex resumed>)        = 0
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3603] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3602] <... futex resumed>)        = 0
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3602] <... futex resumed>)        = 0
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] <... socket resumed>)       = 5
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3602] <... futex resumed>)        = 0
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] <... futex resumed>)        = 0
[pid  3603] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] <... futex resumed>)        = 0
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] <... futex resumed>)        = 0
[pid  3602] <... futex resumed>)        = 1
[pid  3603] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] <... ioctl resumed>)        = 0
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] <... futex resumed>)        = 0
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] <... futex resumed>)        = 0
[pid  3602] <... futex resumed>)        = 1
[pid  3603] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] <... futex resumed>)        = 0
[pid  3602] <... futex resumed>)        = 1
[pid  3603] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] <... openat resumed>)       = 6
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3602] <... futex resumed>)        = 0
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3603] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3603] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3602] <... futex resumed>)        = 0
[pid  3603] <... openat resumed>)       = 7
[pid  3602] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3603] write(7, "5", 1)            = 1
[pid  3603] ioctl(6, NBD_DO_IT)         = 0
[pid  3603] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3603] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3602] <... futex resumed>)        = 0
[pid  3602] exit_group(0)               = ?
[pid  3603] <... futex resumed>)        = 230
[pid  3603] +++ exited with 0 +++
[pid  3602] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3602, 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=0x555555e5b5d0) = 3606
./strace-static-x86_64: Process 3606 attached
[pid  3606] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3606] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3606] setpgid(0, 0)               = 0
[pid  3606] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
syzkaller login: [   48.621999][   T48] block nbd0: Receive control failed (result -107)
[   48.622767][   T48] block nbd0: Receive control failed (result -32)
[   48.628592][ T3603] block nbd0: shutting down sockets
[pid  3606] write(3, "1000", 4)         = 4
[pid  3606] close(3)                    = 0
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3606] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3606] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3606] clone(child_stack=0x7f21afd713f0, 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 3607 attached
 <unfinished ...>
[pid  3607] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] <... clone resumed>, parent_tid=[3607], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3607
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3607] <... futex resumed>)        = 0
[pid  3607] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out)
[pid  3606] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3606] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd30000
[pid  3606] mprotect(0x7f21afd31000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3606] clone(child_stack=0x7f21afd503f0, 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=0x7f21afd50700, child_tidptr=0x7f21afd509d0) = 3608
./strace-static-x86_64: Process 3608 attached
[pid  3608] set_robust_list(0x7f21afd509e0, 24) = 0
[pid  3608] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484f8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3608] <... futex resumed>)        = 0
[pid  3608] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3606] futex(0x7f21afe484fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... openat resumed>)       = 3
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3608] <... openat resumed>)       = 4
[pid  3608] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3608] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = 0
[pid  3606] <... futex resumed>)        = 1
[pid  3607] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... socket resumed>)       = 5
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3606] <... futex resumed>)        = 0
[pid  3607] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... ioctl resumed>)        = 0
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3606] <... futex resumed>)        = 0
[pid  3607] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... ioctl resumed>)        = 0
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3606] <... futex resumed>)        = 0
[pid  3607] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... ioctl resumed>)        = 0
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3606] <... futex resumed>)        = 0
[pid  3607] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... openat resumed>)       = 6
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3607] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3606] <... futex resumed>)        = 0
[pid  3607] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3606] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3607] <... openat resumed>)       = 7
[pid  3607] write(7, "5", 1)            = 1
[pid  3607] ioctl(6, NBD_DO_IT)         = 0
[pid  3607] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3606] <... futex resumed>)        = 0
[pid  3607] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3606] exit_group(0 <unfinished ...>
[pid  3608] <... futex resumed>)        = ?
[pid  3607] <... futex resumed>)        = ?
[pid  3606] <... exit_group resumed>)   = ?
[pid  3608] +++ exited with 0 +++
[pid  3607] +++ exited with 0 +++
[pid  3606] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3606, 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=0x555555e5b5d0) = 3609
./strace-static-x86_64: Process 3609 attached
[pid  3609] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3609] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3609] setpgid(0, 0)               = 0
[pid  3609] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3609] write(3, "1000", 4)         = 4
[pid  3609] close(3)                    = 0
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3609] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3609] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3609] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3610], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3610
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3610 attached
 <unfinished ...>
[pid  3610] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3610] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] <... futex resumed>)        = 0
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3610] <... futex resumed>)        = 0
[pid  3610] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3609] <... futex resumed>)        = 0
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3610] <... futex resumed>)        = 1
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3610] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3609] <... futex resumed>)        = 0
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3610] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3609] <... futex resumed>)        = 0
[pid  3610] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   48.846919][ T3605] block nbd0: Receive control failed (result -107)
[   48.846992][ T3605] block nbd0: Receive control failed (result -32)
[   48.852687][ T3604] block nbd0: shutting down sockets
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out)
[pid  3609] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3609] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd30000
[pid  3609] mprotect(0x7f21afd31000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3609] clone(child_stack=0x7f21afd503f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3611], tls=0x7f21afd50700, child_tidptr=0x7f21afd509d0) = 3611
[pid  3609] futex(0x7f21afe484f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3609] futex(0x7f21afe484fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3611 attached
 <unfinished ...>
[pid  3611] set_robust_list(0x7f21afd509e0, 24) = 0
[pid  3611] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3610] <... ioctl resumed>)        = 0
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3610] <... futex resumed>)        = 0
[pid  3609] <... futex resumed>)        = 1
[pid  3610] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3611] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3610] <... ioctl resumed>)        = 0
[pid  3611] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3611] <... futex resumed>)        = 0
[pid  3610] <... futex resumed>)        = 1
[pid  3609] <... futex resumed>)        = 0
[pid  3611] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3610] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3609] <... futex resumed>)        = 0
[pid  3610] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3610] <... openat resumed>)       = 6
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3609] <... futex resumed>)        = 0
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3610] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3609] <... futex resumed>)        = 0
[pid  3610] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3609] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3610] <... openat resumed>)       = 7
[pid  3610] write(7, "5", 1)            = 1
[pid  3610] ioctl(6, NBD_DO_IT)         = 0
[pid  3610] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3609] <... futex resumed>)        = 0
[pid  3610] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3609] exit_group(0 <unfinished ...>
[pid  3611] <... futex resumed>)        = ?
[pid  3610] <... futex resumed>)        = ?
[pid  3609] <... exit_group resumed>)   = ?
[pid  3611] +++ exited with 0 +++
[   48.999974][ T3611] block nbd0: Device being setup by another task
[   49.045167][   T48] block nbd0: Receive control failed (result -107)
[pid  3610] +++ exited with 0 +++
[pid  3609] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3609, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3612
./strace-static-x86_64: Process 3612 attached
[pid  3612] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3612] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[   49.057797][ T3610] block nbd0: shutting down sockets
[pid  3612] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3612] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3613
./strace-static-x86_64: Process 3613 attached
[pid  3613] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3613] <... futex resumed>)        = 0
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3612] <... futex resumed>)        = 1
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3613] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3612] <... futex resumed>)        = 1
[pid  3613] <... socket resumed>)       = 5
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3612] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3613] <... futex resumed>)        = 0
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... ioctl resumed>)        = 0
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3612] <... futex resumed>)        = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3612] <... futex resumed>)        = 1
[pid  3613] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... ioctl resumed>)        = 0
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] <... futex resumed>)        = 0
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3612] <... 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3612] <... futex resumed>)        = 1
[pid  3613] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 6
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3612] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3613] <... futex resumed>)        = 0
[pid  3612] <... futex resumed>)        = 1
[pid  3613] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3612] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3613] <... openat resumed>)       = 7
[pid  3613] write(7, "5", 1)            = 1
[pid  3613] ioctl(6, NBD_DO_IT)         = 0
[pid  3613] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3612] <... futex resumed>)        = 0
[pid  3613] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3612] exit_group(0 <unfinished ...>
[pid  3613] <... futex resumed>)        = ?
[pid  3612] <... exit_group resumed>)   = ?
[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=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3614
./strace-static-x86_64: Process 3614 attached
[pid  3614] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3614] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3614] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3615
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3615 attached
 <unfinished ...>
[pid  3615] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3615] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... openat resumed>)       = 4
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3615] <... futex resumed>)        = 1
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3615] <... socket resumed>)       = 5
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3615] <... futex resumed>)        = 0
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[   49.244904][   T48] block nbd0: Receive control failed (result -107)
[   49.244978][   T48] block nbd0: Receive control failed (result -32)
[   49.249713][ T3604] block nbd0: shutting down sockets
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... ioctl resumed>)        = 0
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] <... ioctl resumed>)        = 0
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3615] <... ioctl resumed>)        = 0
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3614] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3615] <... futex resumed>)        = 0
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3615] <... openat resumed>)       = 6
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3614] <... futex resumed>)        = 0
[pid  3615] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3615] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3614] <... futex resumed>)        = 0
[pid  3614] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3615] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 7
[pid  3615] write(7, "5", 1)            = 1
[pid  3615] ioctl(6, NBD_DO_IT)         = 0
[pid  3615] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3615] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3614] <... futex resumed>)        = 0
[pid  3614] exit_group(0 <unfinished ...>
[pid  3615] <... futex resumed>)        = ?
[pid  3614] <... exit_group resumed>)   = ?
[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=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3616 attached
, child_tidptr=0x555555e5b5d0) = 3616
[pid  3616] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3616] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3616] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3617
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3617 attached
 <unfinished ...>
[pid  3617] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f21afe484ec, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3617] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] <... socket resumed>)       = 5
[pid  3616] <... futex resumed>)        = 0
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... futex resumed>)        = 0
[pid  3616] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3617] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   49.400246][ T3605] block nbd0: Receive control failed (result -107)
[   49.400372][ T3605] block nbd0: Receive control failed (result -32)
[   49.406489][ T3604] block nbd0: shutting down sockets
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... ioctl resumed>)        = 0
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3617] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3616] <... futex resumed>)        = 0
[pid  3617] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... ioctl resumed>)        = 0
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[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|NBD_FLAG_SEND_CACHE) = 0
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 6
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3617] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3616] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3617] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3616] <... futex resumed>)        = 0
[pid  3617] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3616] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3617] <... openat resumed>)       = 7
[pid  3617] write(7, "5", 1)            = 1
[pid  3617] ioctl(6, NBD_DO_IT)         = 0
[pid  3617] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3616] <... futex resumed>)        = 0
[pid  3617] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3616] exit_group(0)               = ?
[pid  3617] <... futex resumed>)        = ?
[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=1} ---
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=0x555555e5b5d0) = 3618
[pid  3618] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3618] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3618] setpgid(0, 0)               = 0
[   49.548052][ T3605] block nbd0: Receive control failed (result -107)
[   49.548128][ T3605] block nbd0: Receive control failed (result -32)
[   49.559978][ T3617] block nbd0: shutting down sockets
[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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3618] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3618] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3619
[pid  3619] set_robust_list(0x7f21afd719e0, 24 <unfinished ...>
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... set_robust_list resumed>) = 0
[pid  3619] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... openat resumed>)       = 4
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3619] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... ioctl resumed>)        = 0
[pid  3619] futex(0x7f21afe484ec, 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... ioctl resumed>)        = 0
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... futex resumed>)        = 0
[pid  3619] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3618] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3619] <... futex resumed>)        = 0
[pid  3618] <... futex resumed>)        = 1
[pid  3619] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3618] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... openat resumed>)       = 6
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3619] <... openat resumed>)       = 7
[pid  3619] write(7, "5", 1)            = 1
[pid  3619] ioctl(6, NBD_DO_IT)         = 0
[pid  3619] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3618] <... futex resumed>)        = 0
[pid  3619] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3618] exit_group(0 <unfinished ...>
[pid  3619] <... futex resumed>)        = ?
[pid  3618] <... exit_group resumed>)   = ?
[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=0} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3620
./strace-static-x86_64: Process 3620 attached
[pid  3620] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3620] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3620] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3621
[pid  3620] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3621 attached
 <unfinished ...>
[pid  3621] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3621] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f21afe484ec, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[pid  3621] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3620] <... futex resumed>)        = 0
[pid  3620] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3620] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... futex resumed>)        = 1
[   49.738254][   T48] block nbd0: Receive control failed (result -107)
[   49.738385][   T48] block nbd0: Receive control failed (result -32)
[   49.757476][ T3618] block nbd0: shutting down sockets
[pid  3621] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... ioctl resumed>)        = 0
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3621] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3620] <... futex resumed>)        = 0
[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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3620] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... ioctl resumed>)        = 0
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... openat resumed>)       = 6
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] futex(0x7f21afe484e8, 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(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3621] <... openat resumed>)       = 7
[pid  3621] write(7, "5", 1)            = 1
[pid  3621] ioctl(6, NBD_DO_IT)         = 0
[pid  3621] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3620] <... futex resumed>)        = 0
[pid  3621] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3620] exit_group(0 <unfinished ...>
[pid  3621] <... futex 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} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3622
./strace-static-x86_64: Process 3622 attached
[pid  3622] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3622] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3622] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3623
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3623 attached
 <unfinished ...>
[pid  3623] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3623] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f21afe484ec, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... futex resumed>)        = 1
[pid  3623] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... futex resumed>)        = 1
[   49.859024][   T48] block nbd0: Receive control failed (result -107)
[   49.859098][   T48] block nbd0: Receive control failed (result -32)
[   49.867504][ T3620] block nbd0: shutting down sockets
[pid  3623] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3622] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3622] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3622] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd30000
[pid  3622] mprotect(0x7f21afd31000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3622] clone(child_stack=0x7f21afd503f0, 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 3624 attached
 <unfinished ...>
[pid  3624] set_robust_list(0x7f21afd509e0, 24 <unfinished ...>
[pid  3622] <... clone resumed>, parent_tid=[3624], tls=0x7f21afd50700, child_tidptr=0x7f21afd509d0) = 3624
[pid  3624] <... set_robust_list resumed>) = 0
[pid  3622] futex(0x7f21afe484f8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3624] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f21afe484fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... ioctl resumed>)        = 0
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3623] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3624] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3624] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3624] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] <... futex resumed>)        = 0
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... futex resumed>)        = 0
[pid  3622] <... 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3623] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... futex resumed>)        = 0
[pid  3622] <... futex resumed>)        = 1
[pid  3623] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... openat resumed>)       = 6
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3622] <... futex resumed>)        = 0
[pid  3623] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3623] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3622] <... futex resumed>)        = 0
[pid  3623] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3622] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3623] <... openat resumed>)       = 7
[pid  3623] write(7, "5", 1)            = 1
[   49.989938][ T3624] block nbd0: Device being setup by another task
[pid  3623] ioctl(6, NBD_DO_IT)         = 0
[pid  3623] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3622] <... futex resumed>)        = 0
[pid  3623] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3622] exit_group(0 <unfinished ...>
[pid  3624] <... futex resumed>)        = ?
[pid  3623] <... futex resumed>)        = ?
[pid  3622] <... exit_group resumed>)   = ?
[pid  3624] +++ exited with 0 +++
[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./strace-static-x86_64: Process 3625 attached
 <unfinished ...>
[pid  3625] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3625] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3625] setpgid(0, 0)               = 0
[pid  3625] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3625] write(3, "1000", 4)         = 4
[pid  3625] close(3)                    = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3625] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3625] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3601] <... clone resumed>, child_tidptr=0x555555e5b5d0) = 3625
[pid  3625] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3626], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3626
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3626 attached
 <unfinished ...>
[pid  3626] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3626] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = 0
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... futex resumed>)        = 1
[pid  3626] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = 0
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... futex resumed>)        = 1
[pid  3626] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3625] <... futex resumed>)        = 0
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... futex resumed>)        = 1
[   50.035250][ T3605] block nbd0: Receive control failed (result -107)
[   50.040871][ T3604] block nbd0: shutting down sockets
[pid  3626] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3625] <... futex resumed>)        = 0
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3626] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3625] <... futex resumed>)        = 0
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... ioctl resumed>)        = 0
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3625] <... futex resumed>)        = 0
[pid  3626] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3626] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3625] <... futex resumed>)        = 0
[pid  3626] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... ioctl resumed>)        = 0
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3625] <... futex resumed>)        = 0
[pid  3626] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3626] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3625] <... futex resumed>)        = 0
[pid  3626] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... openat resumed>)       = 6
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3625] <... futex resumed>)        = 0
[pid  3626] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3625] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3626] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3625] <... futex resumed>)        = 0
[pid  3626] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3625] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3626] <... openat resumed>)       = 7
[pid  3626] write(7, "5", 1)            = 1
[pid  3626] ioctl(6, NBD_DO_IT)         = 0
[pid  3626] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3625] <... futex resumed>)        = 0
[pid  3626] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3625] exit_group(0 <unfinished ...>
[pid  3626] <... futex resumed>)        = ?
[pid  3625] <... exit_group resumed>)   = ?
[pid  3626] +++ exited with 0 +++
[pid  3625] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3625, 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=0x555555e5b5d0) = 3627
./strace-static-x86_64: Process 3627 attached
[pid  3627] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3627] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3627] setpgid(0, 0)               = 0
[pid  3627] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3627] write(3, "1000", 4)         = 4
[pid  3627] close(3)                    = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3627] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3627] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3628], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3628
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3628 attached
 <unfinished ...>
[pid  3628] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3628] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   50.214471][ T3605] block nbd0: Receive control failed (result -107)
[   50.214594][ T3605] block nbd0: Receive control failed (result -32)
[   50.233809][ T3626] block nbd0: shutting down sockets
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] <... futex resumed>)        = 1
[pid  3628] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] <... futex resumed>)        = 1
[pid  3628] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] <... futex resumed>)        = 1
[pid  3628] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3627] <... futex resumed>)        = 0
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 6
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3627] <... futex resumed>)        = 0
[pid  3628] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3627] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3628] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3627] <... futex resumed>)        = 0
[pid  3628] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3627] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3628] <... openat resumed>)       = 7
[pid  3628] write(7, "5", 1)            = 1
[pid  3628] ioctl(6, NBD_DO_IT)         = 0
[pid  3628] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3627] <... futex resumed>)        = 0
[pid  3628] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3627] exit_group(0 <unfinished ...>
[pid  3628] <... futex resumed>)        = ?
[pid  3627] <... exit_group resumed>)   = ?
[pid  3628] +++ exited with 0 +++
[pid  3627] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3627, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3629
./strace-static-x86_64: Process 3629 attached
[pid  3629] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3629] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3629] setpgid(0, 0)               = 0
[pid  3629] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3629] write(3, "1000", 4)         = 4
[pid  3629] close(3)                    = 0
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3629] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3629] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3629] clone(child_stack=0x7f21afd713f0, 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 3630 attached
 <unfinished ...>
[pid  3630] set_robust_list(0x7f21afd719e0, 24 <unfinished ...>
[pid  3629] <... clone resumed>, parent_tid=[3630], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3630
[pid  3630] <... set_robust_list resumed>) = 0
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3630] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[   50.406996][ T3605] block nbd0: Receive control failed (result -107)
[   50.407139][ T3605] block nbd0: Receive control failed (result -32)
[   50.412587][ T3604] block nbd0: shutting down sockets
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... openat resumed>)       = 3
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... openat resumed>)       = 4
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... futex resumed>)        = 0
[pid  3629] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... socket resumed>)       = 5
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... futex resumed>)        = 0
[pid  3629] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3630] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... ioctl resumed>)        = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3629] <... futex resumed>)        = 0
[pid  3630] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... ioctl resumed>)        = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3629] <... futex resumed>)        = 0
[pid  3630] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... ioctl resumed>)        = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3629] <... futex resumed>)        = 0
[pid  3630] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... openat resumed>)       = 6
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3629] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3630] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3629] <... futex resumed>)        = 0
[pid  3630] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3629] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3630] <... openat resumed>)       = 7
[pid  3630] write(7, "5", 1)            = 1
[pid  3630] ioctl(6, NBD_DO_IT)         = 0
[pid  3630] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3629] <... futex resumed>)        = 0
[pid  3630] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3629] exit_group(0 <unfinished ...>
[pid  3630] <... futex resumed>)        = ?
[pid  3629] <... exit_group resumed>)   = ?
[pid  3630] +++ exited with 0 +++
[pid  3629] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3629, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3631 attached
, child_tidptr=0x555555e5b5d0) = 3631
[pid  3631] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3631] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3631] setpgid(0, 0)               = 0
[pid  3631] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3631] write(3, "1000", 4)         = 4
[pid  3631] close(3)                    = 0
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3631] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3631] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3631] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3632], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3632
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3632 attached
 <unfinished ...>
[pid  3632] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3632] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = 0
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 1
[pid  3631] <... futex resumed>)        = 0
[pid  3632] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] <... openat resumed>)       = 4
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3631] <... futex resumed>)        = 0
[pid  3632] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... socket resumed>)       = 5
[pid  3631] <... futex resumed>)        = 0
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] ioctl(4, NBD_SET_SOCK, 5)   = 0
[   50.555093][ T3630] debugfs: out of free dentries, can not create directory 'nbd0'
[   50.555362][ T3605] block nbd0: Receive control failed (result -107)
[   50.555472][ T3605] block nbd0: Receive control failed (result -32)
[   50.559419][ T3604] block nbd0: shutting down sockets
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3631] <... futex resumed>)        = 0
[pid  3632] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3631] <... futex resumed>)        = 0
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] <... ioctl resumed>)        = 0
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3632] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3631] <... futex resumed>)        = 0
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] <... futex resumed>)        = 0
[pid  3631] <... futex resumed>)        = 1
[pid  3632] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] <... ioctl resumed>)        = 0
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3631] <... futex resumed>)        = 0
[pid  3632] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3632] <... openat resumed>)       = 6
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3631] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3632] <... futex resumed>)        = 0
[pid  3631] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3632] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3631] <... futex resumed>)        = 0
[pid  3632] <... openat resumed>)       = 7
[pid  3631] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3632] write(7, "5", 1)            = 1
[pid  3632] ioctl(6, NBD_DO_IT)         = 0
[pid  3632] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3631] <... futex resumed>)        = 0
[pid  3632] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3631] exit_group(0 <unfinished ...>
[pid  3632] <... futex resumed>)        = ?
[pid  3631] <... exit_group resumed>)   = ?
[pid  3632] +++ exited with 0 +++
[pid  3631] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3631, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3633 attached
, child_tidptr=0x555555e5b5d0) = 3633
[pid  3633] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3633] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3633] setpgid(0, 0)               = 0
[pid  3633] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3633] write(3, "1000", 4)         = 4
[pid  3633] close(3)                    = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3633] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3633] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3633] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3634], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3634
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3634 attached
 <unfinished ...>
[pid  3634] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3634] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3634] <... futex resumed>)        = 1
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] <... openat resumed>)       = 4
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3634] <... futex resumed>)        = 1
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] <... socket resumed>)       = 5
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3634] <... futex resumed>)        = 1
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] <... ioctl resumed>)        = 0
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3633] <... futex resumed>)        = 0
[pid  3634] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3633] <... futex resumed>)        = 0
[pid  3634] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   50.687573][   T48] block nbd0: Receive control failed (result -107)
[   50.687647][   T48] block nbd0: Receive control failed (result -32)
[   50.705958][ T3631] block nbd0: shutting down sockets
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] <... ioctl resumed>)        = 0
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3633] <... futex resumed>)        = 0
[pid  3634] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3634] <... ioctl resumed>)        = 0
[pid  3633] <... futex resumed>)        = 0
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] <... futex resumed>)        = 0
[pid  3633] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3634] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3634] <... openat resumed>)       = 6
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3633] <... futex resumed>)        = 0
[pid  3633] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3633] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3634] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR) = 7
[pid  3634] write(7, "5", 1)            = 1
[pid  3634] ioctl(6, NBD_DO_IT)         = 0
[pid  3634] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3634] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3633] <... futex resumed>)        = 0
[pid  3633] exit_group(0 <unfinished ...>
[pid  3634] <... futex resumed>)        = ?
[pid  3633] <... exit_group resumed>)   = ?
[pid  3634] +++ exited with 0 +++
[pid  3633] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3633, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3635
./strace-static-x86_64: Process 3635 attached
[pid  3635] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3635] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3635] setpgid(0, 0)               = 0
[pid  3635] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3635] write(3, "1000", 4)         = 4
[pid  3635] close(3)                    = 0
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3635] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3635] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3635] clone(child_stack=0x7f21afd713f0, 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 3636 attached
, parent_tid=[3636], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3636
[pid  3636] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3635] <... futex resumed>)        = 1
[pid  3636] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... openat resumed>)       = 3
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] <... futex resumed>)        = 0
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3636] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... openat resumed>)       = 4
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] <... futex resumed>)        = 0
[pid  3636] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   50.799662][ T3634] debugfs: out of free dentries, can not create directory 'nbd0'
[   50.799798][ T3605] block nbd0: Receive control failed (result -107)
[   50.799939][ T3605] block nbd0: Receive control failed (result -32)
[   50.824265][ T3633] block nbd0: shutting down sockets
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... ioctl resumed>)        = 0
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3635] <... futex resumed>)        = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3635] <... futex resumed>)        = 0
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... ioctl resumed>)        = 0
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] <... futex resumed>)        = 0
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3635] <... futex resumed>)        = 1
[pid  3636] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = 0
[pid  3635] <... futex resumed>)        = 1
[pid  3636] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... openat resumed>)       = 6
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3635] <... futex resumed>)        = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3636] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3635] <... futex resumed>)        = 0
[pid  3636] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3635] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3636] <... openat resumed>)       = 7
[pid  3636] write(7, "5", 1)            = 1
[pid  3636] ioctl(6, NBD_DO_IT)         = 0
[pid  3636] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3635] <... futex resumed>)        = 0
[pid  3636] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3635] exit_group(0)               = ?
[pid  3636] <... futex resumed>)        = -1 (errno 18446744073709551555)
[pid  3636] +++ exited with 0 +++
[pid  3635] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3635, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3637 attached
, child_tidptr=0x555555e5b5d0) = 3637
[pid  3637] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3637] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3637] setpgid(0, 0)               = 0
[pid  3637] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3637] write(3, "1000", 4)         = 4
[pid  3637] close(3)                    = 0
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3637] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3637] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3637] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3638], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3638
./strace-static-x86_64: Process 3638 attached
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3638] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... openat resumed>)       = 4
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3637] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3638] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... socket resumed>)       = 5
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... futex resumed>)        = 0
[pid  3637] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3638] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... ioctl resumed>)        = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3637] <... futex resumed>)        = 0
[pid  3638] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   50.948087][ T3636] debugfs: out of free dentries, can not create directory 'nbd0'
[   50.948225][   T48] block nbd0: Receive control failed (result -107)
[   50.948426][   T48] block nbd0: Receive control failed (result -32)
[   50.971984][ T3636] block nbd0: shutting down sockets
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... ioctl resumed>)        = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3637] <... futex resumed>)        = 0
[pid  3638] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... ioctl resumed>)        = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3637] <... futex resumed>)        = 0
[pid  3638] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... openat resumed>)       = 6
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3637] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3638] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3637] <... futex resumed>)        = 0
[pid  3638] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3637] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3638] <... openat resumed>)       = 7
[pid  3638] write(7, "5", 1)            = 1
[pid  3638] ioctl(6, NBD_DO_IT)         = 0
[pid  3638] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3637] <... futex resumed>)        = 0
[pid  3638] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3637] exit_group(0 <unfinished ...>
[pid  3638] <... futex resumed>)        = ?
[pid  3637] <... exit_group resumed>)   = ?
[pid  3638] +++ exited with 0 +++
[pid  3637] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3637, 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=0x555555e5b5d0) = 3639
./strace-static-x86_64: Process 3639 attached
[pid  3639] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3639] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3639] setpgid(0, 0)               = 0
[pid  3639] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3639] write(3, "1000", 4)         = 4
[pid  3639] close(3)                    = 0
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3639] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3639] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3639] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3640], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3640
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3640 attached
 <unfinished ...>
[pid  3640] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3640] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3640] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] <... futex resumed>)        = 0
[pid  3640] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   51.066555][ T3638] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.066775][ T3605] block nbd0: Receive control failed (result -107)
[   51.066902][ T3605] block nbd0: Receive control failed (result -32)
[   51.074138][ T3604] block nbd0: shutting down sockets
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... ioctl resumed>)        = 0
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] <... futex resumed>)        = 0
[pid  3640] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... ioctl resumed>)        = 0
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3640] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] <... futex resumed>)        = 0
[pid  3640] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... openat resumed>)       = 6
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3639] <... futex resumed>)        = 0
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3640] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3639] <... futex resumed>)        = 0
[pid  3640] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3639] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3640] <... openat resumed>)       = 7
[pid  3640] write(7, "5", 1)            = 1
[pid  3640] ioctl(6, NBD_DO_IT)         = 0
[pid  3640] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3639] <... futex resumed>)        = 0
[pid  3640] <... futex resumed>)        = 1
[pid  3640] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3639] exit_group(0 <unfinished ...>
[pid  3640] <... futex resumed>)        = 230
[pid  3639] <... exit_group resumed>)   = ?
[pid  3640] +++ exited with 0 +++
[pid  3639] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3639, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3641
./strace-static-x86_64: Process 3641 attached
[pid  3641] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3641] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3641] setpgid(0, 0)               = 0
[pid  3641] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3641] write(3, "1000", 4)         = 4
[pid  3641] close(3)                    = 0
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3641] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3641] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3641] clone(child_stack=0x7f21afd713f0, 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 3642 attached
, parent_tid=[3642], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3642
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3642] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3642] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3641] <... futex resumed>)        = 0
[pid  3642] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   51.207551][ T3640] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.207671][   T48] block nbd0: Receive control failed (result -107)
[   51.207747][   T48] block nbd0: Receive control failed (result -32)
[   51.225945][ T3640] block nbd0: shutting down sockets
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... ioctl resumed>)        = 0
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3641] <... futex resumed>)        = 0
[pid  3642] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... ioctl resumed>)        = 0
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3641] <... futex resumed>)        = 0
[pid  3642] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... ioctl resumed>)        = 0
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3641] <... futex resumed>)        = 0
[pid  3642] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... openat resumed>)       = 6
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3642] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3641] <... futex resumed>)        = 0
[pid  3642] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3641] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3642] <... openat resumed>)       = 7
[pid  3642] write(7, "5", 1)            = 1
[pid  3642] ioctl(6, NBD_DO_IT)         = 0
[pid  3642] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3641] <... futex resumed>)        = 0
[pid  3642] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3641] exit_group(0 <unfinished ...>
[pid  3642] <... futex resumed>)        = ?
[pid  3641] <... exit_group resumed>)   = ?
[pid  3642] +++ exited with 0 +++
[pid  3641] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3641, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3643 attached
, child_tidptr=0x555555e5b5d0) = 3643
[pid  3643] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3643] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3643] setpgid(0, 0)               = 0
[pid  3643] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3643] write(3, "1000", 4)         = 4
[pid  3643] close(3)                    = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3643] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3643] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3643] clone(child_stack=0x7f21afd713f0, 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 3644 attached
, parent_tid=[3644], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3644
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3644] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] <... ioctl resumed>)        = 0
[   51.375328][ T3642] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.375521][ T3605] block nbd0: Receive control failed (result -107)
[   51.375600][ T3605] block nbd0: Receive control failed (result -32)
[   51.379572][ T3604] block nbd0: shutting down sockets
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3643] <... futex resumed>)        = 0
[pid  3644] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] <... ioctl resumed>)        = 0
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3644] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3643] <... futex resumed>)        = 0
[pid  3644] <... ioctl resumed>)        = 0
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3644] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] <... openat resumed>)       = 6
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3643] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3644] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3643] <... futex resumed>)        = 0
[pid  3644] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3643] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3644] <... openat resumed>)       = 7
[pid  3644] write(7, "5", 1)            = 1
[pid  3644] ioctl(6, NBD_DO_IT)         = 0
[pid  3644] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3643] <... futex resumed>)        = 0
[pid  3644] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3643] exit_group(0 <unfinished ...>
[pid  3644] <... futex resumed>)        = ?
[pid  3643] <... exit_group resumed>)   = ?
[pid  3644] +++ exited with 0 +++
[pid  3643] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3643, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3645
./strace-static-x86_64: Process 3645 attached
[pid  3645] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3645] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3645] setpgid(0, 0)               = 0
[pid  3645] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3645] write(3, "1000", 4)         = 4
[pid  3645] close(3)                    = 0
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3645] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3645] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3645] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3646], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3646
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3646 attached
 <unfinished ...>
[pid  3646] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3646] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = 0
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... futex resumed>)        = 1
[pid  3646] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = 0
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... futex resumed>)        = 1
[pid  3646] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3645] <... futex resumed>)        = 0
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... futex resumed>)        = 1
[pid  3646] ioctl(4, NBD_SET_SOCK, 5)   = 0
[   51.508641][ T3644] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.508760][   T48] block nbd0: Receive control failed (result -107)
[   51.508837][   T48] block nbd0: Receive control failed (result -32)
[   51.534152][ T3643] block nbd0: shutting down sockets
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3645] <... futex resumed>)        = 0
[pid  3646] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3645] <... futex resumed>)        = 0
[pid  3646] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... ioctl resumed>)        = 0
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3645] <... futex resumed>)        = 0
[pid  3646] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3645] <... futex resumed>)        = 0
[pid  3646] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... ioctl resumed>)        = 0
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3645] <... futex resumed>)        = 0
[pid  3646] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3645] <... futex resumed>)        = 0
[pid  3646] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... openat resumed>)       = 6
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3645] <... futex resumed>)        = 0
[pid  3646] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3645] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3646] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3645] <... futex resumed>)        = 0
[pid  3646] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3645] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3646] <... openat resumed>)       = 7
[pid  3646] write(7, "5", 1)            = 1
[pid  3646] ioctl(6, NBD_DO_IT)         = 0
[pid  3646] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3645] <... futex resumed>)        = 0
[pid  3646] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3645] exit_group(0 <unfinished ...>
[pid  3646] <... futex resumed>)        = ?
[pid  3645] <... exit_group resumed>)   = ?
[pid  3646] +++ exited with 0 +++
[pid  3645] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3645, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3647
./strace-static-x86_64: Process 3647 attached
[pid  3647] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3647] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3647] setpgid(0, 0)               = 0
[pid  3647] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3647] write(3, "1000", 4)         = 4
[pid  3647] close(3)                    = 0
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3647] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3647] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3647] clone(child_stack=0x7f21afd713f0, 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 3648 attached
, parent_tid=[3648], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3648
[pid  3648] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3648] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3647] <... futex resumed>)        = 1
[pid  3648] <... openat resumed>)       = 3
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3648] <... futex resumed>)        = 0
[pid  3648] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = 0
[pid  3647] <... futex resumed>)        = 1
[pid  3648] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] <... socket resumed>)       = 5
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3647] <... futex resumed>)        = 0
[pid  3648] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   51.648200][ T3646] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.648313][ T3605] block nbd0: Receive control failed (result -107)
[   51.648559][ T3605] block nbd0: Receive control failed (result -32)
[   51.665167][ T3646] block nbd0: shutting down sockets
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] <... ioctl resumed>)        = 0
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3648] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] <... ioctl resumed>)        = 0
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3647] <... futex resumed>)        = 0
[pid  3648] <... ioctl resumed>)        = 0
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 6
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3648] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3647] <... futex resumed>)        = 0
[pid  3648] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3647] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3648] <... openat resumed>)       = 7
[pid  3648] write(7, "5", 1)            = 1
[pid  3648] ioctl(6, NBD_DO_IT)         = 0
[pid  3648] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3647] <... futex resumed>)        = 0
[pid  3648] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3647] exit_group(0 <unfinished ...>
[pid  3648] <... futex resumed>)        = ?
[pid  3647] <... exit_group resumed>)   = ?
[pid  3648] +++ exited with 0 +++
[pid  3647] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3647, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3649 attached
, child_tidptr=0x555555e5b5d0) = 3649
[pid  3649] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3649] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3649] setpgid(0, 0)               = 0
[pid  3649] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3649] write(3, "1000", 4)         = 4
[pid  3649] close(3)                    = 0
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3649] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3649] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3649] clone(child_stack=0x7f21afd713f0, 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 3650 attached
, parent_tid=[3650], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3650
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3650] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3649] <... futex resumed>)        = 0
[pid  3650] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... openat resumed>)       = 4
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... socket resumed>)       = 5
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... futex resumed>)        = 0
[pid  3649] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3650] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   51.818395][ T3648] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.818529][ T3605] block nbd0: Receive control failed (result -107)
[   51.818602][ T3605] block nbd0: Receive control failed (result -32)
[   51.843070][ T3647] block nbd0: shutting down sockets
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... ioctl resumed>)        = 0
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3650] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3649] <... futex resumed>)        = 0
[pid  3650] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... ioctl resumed>)        = 0
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3649] <... futex resumed>)        = 0
[pid  3650] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... openat resumed>)       = 6
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3650] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3649] <... futex resumed>)        = 0
[pid  3650] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3649] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3650] <... openat resumed>)       = 7
[pid  3650] write(7, "5", 1)            = 1
[pid  3650] ioctl(6, NBD_DO_IT)         = 0
[pid  3650] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3649] <... futex resumed>)        = 0
[pid  3650] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3649] exit_group(0 <unfinished ...>
[pid  3650] <... futex resumed>)        = ?
[pid  3649] <... exit_group resumed>)   = ?
[pid  3650] +++ exited with 0 +++
[pid  3649] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3649, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3651
./strace-static-x86_64: Process 3651 attached
[pid  3651] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3651] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3651] setpgid(0, 0)               = 0
[pid  3651] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3651] write(3, "1000", 4)         = 4
[pid  3651] close(3)                    = 0
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3651] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3651] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3651] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3652], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3652
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3652 attached
 <unfinished ...>
[pid  3652] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3652] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3652] <... futex resumed>)        = 1
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] <... socket resumed>)       = 5
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] <... futex resumed>)        = 0
[pid  3652] <... futex resumed>)        = 1
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3652] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] <... ioctl resumed>)        = 0
[   51.965083][ T3650] debugfs: out of free dentries, can not create directory 'nbd0'
[   51.965295][   T48] block nbd0: Receive control failed (result -107)
[   51.965385][   T48] block nbd0: Receive control failed (result -32)
[   51.969201][ T3604] block nbd0: shutting down sockets
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3652] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3651] <... futex resumed>)        = 0
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3652] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... ioctl resumed>)        = 0
[pid  3651] <... futex resumed>)        = 0
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3651] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3652] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... openat resumed>)       = 6
[pid  3651] <... futex resumed>)        = 0
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] <... futex resumed>)        = 0
[pid  3651] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3652] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3651] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3652] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3651] <... futex resumed>)        = 0
[pid  3652] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3651] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3652] <... openat resumed>)       = 7
[pid  3652] write(7, "5", 1)            = 1
[pid  3652] ioctl(6, NBD_DO_IT)         = 0
[pid  3652] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3651] <... futex resumed>)        = 0
[pid  3651] exit_group(0 <unfinished ...>
[pid  3652] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3651] <... exit_group resumed>)   = ?
[pid  3652] <... futex resumed>)        = ?
[pid  3652] +++ exited with 0 +++
[pid  3651] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3651, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3653 attached
, child_tidptr=0x555555e5b5d0) = 3653
[pid  3653] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3653] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3653] setpgid(0, 0)               = 0
[pid  3653] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3653] write(3, "1000", 4)         = 4
[pid  3653] close(3)                    = 0
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3653] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3653] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3653] clone(child_stack=0x7f21afd713f0, 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 3654 attached
, parent_tid=[3654], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3654
[pid  3654] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] <... futex resumed>)        = 0
[pid  3654] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... openat resumed>)       = 3
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] <... futex resumed>)        = 0
[pid  3654] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... openat resumed>)       = 4
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] <... futex resumed>)        = 0
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... futex resumed>)        = 0
[pid  3654] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3653] <... futex resumed>)        = 0
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] <... futex resumed>)        = 0
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[   52.096995][ T3652] debugfs: out of free dentries, can not create directory 'nbd0'
[   52.097128][ T3605] block nbd0: Receive control failed (result -107)
[   52.097200][ T3605] block nbd0: Receive control failed (result -32)
[   52.122328][ T3652] block nbd0: shutting down sockets
[pid  3654] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3653] <... futex resumed>)        = 0
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3653] <... futex resumed>)        = 0
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... ioctl resumed>)        = 0
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] <... futex resumed>)        = 0
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] <... futex resumed>)        = 0
[pid  3653] <... futex resumed>)        = 1
[pid  3654] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... futex resumed>)        = 0
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] <... futex resumed>)        = 0
[pid  3653] <... futex resumed>)        = 1
[pid  3654] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 6
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3653] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3654] <... futex resumed>)        = 0
[pid  3654] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3653] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3654] <... openat resumed>)       = 7
[pid  3653] <... futex resumed>)        = 0
[pid  3654] write(7, "5", 1 <unfinished ...>
[pid  3653] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3654] <... write resumed>)        = 1
[pid  3654] ioctl(6, NBD_DO_IT)         = 0
[pid  3654] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3654] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3653] <... futex resumed>)        = 0
[pid  3653] exit_group(0 <unfinished ...>
[pid  3654] <... futex resumed>)        = ?
[pid  3653] <... exit_group resumed>)   = ?
[pid  3654] +++ exited with 0 +++
[pid  3653] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3653, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3655 attached
, child_tidptr=0x555555e5b5d0) = 3655
[pid  3655] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3655] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3655] setpgid(0, 0)               = 0
[pid  3655] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3655] write(3, "1000", 4)         = 4
[pid  3655] close(3)                    = 0
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3655] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3655] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3656], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3656
./strace-static-x86_64: Process 3656 attached
[pid  3656] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3656] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3655] <... futex resumed>)        = 0
[pid  3656] <... openat resumed>)       = 3
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3655] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3656] <... futex resumed>)        = 0
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3656] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3655] <... futex resumed>)        = 0
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... openat resumed>)       = 4
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3656] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... socket resumed>)       = 5
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3656] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3655] <... futex resumed>)        = 0
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3656] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3656] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   52.249018][ T3654] debugfs: out of free dentries, can not create directory 'nbd0'
[   52.249302][   T48] block nbd0: Receive control failed (result -107)
[   52.249494][   T48] block nbd0: Receive control failed (result -32)
[   52.271600][ T3653] block nbd0: shutting down sockets
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... ioctl resumed>)        = 0
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3656] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3656] <... futex resumed>)        = 0
[pid  3655] <... futex resumed>)        = 1
[pid  3656] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... ioctl resumed>)        = 0
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3656] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3656] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3655] <... futex resumed>)        = 0
[pid  3656] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... openat resumed>)       = 6
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3656] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3655] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3656] <... futex resumed>)        = 0
[pid  3655] <... futex resumed>)        = 1
[pid  3656] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3655] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3656] <... openat resumed>)       = 7
[pid  3656] write(7, "5", 1)            = 1
[pid  3656] ioctl(6, NBD_DO_IT)         = 0
[pid  3656] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3655] <... futex resumed>)        = 0
[pid  3656] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3655] exit_group(0 <unfinished ...>
[pid  3656] <... futex resumed>)        = ?
[pid  3655] <... exit_group resumed>)   = ?
[pid  3656] +++ exited with 0 +++
[pid  3655] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3655, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3657
./strace-static-x86_64: Process 3657 attached
[pid  3657] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3657] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3657] clone(child_stack=0x7f21afd713f0, 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=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3658
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3658 attached
 <unfinished ...>
[pid  3658] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3658] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[pid  3658] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... openat resumed>)       = 4
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3658] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3658] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3658] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3657] <... futex resumed>)        = 0
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... socket resumed>)       = 5
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[pid  3658] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3658] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3657] <... futex resumed>)        = 0
[pid  3658] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[   52.366772][ T3656] debugfs: out of free dentries, can not create directory 'nbd0'
[   52.366863][   T48] block nbd0: Receive control failed (result -107)
[   52.366974][   T48] block nbd0: Receive control failed (result -32)
[   52.385286][ T3655] block nbd0: shutting down sockets
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... ioctl resumed>)        = 0
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[pid  3658] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3658] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3658] <... ioctl resumed>)        = 0
[pid  3657] <... futex resumed>)        = 0
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... futex resumed>)        = 0
[pid  3658] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3657] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3658] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3658] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... openat resumed>)       = 6
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[pid  3658] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3657] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3658] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3657] <... futex resumed>)        = 0
[pid  3658] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3657] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3658] <... openat resumed>)       = 7
[pid  3658] write(7, "5", 1)            = 1
[pid  3658] ioctl(6, NBD_DO_IT)         = 0
[pid  3658] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3657] <... futex resumed>)        = 0
[pid  3657] exit_group(0)               = ?
[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=1} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3659 attached
, child_tidptr=0x555555e5b5d0) = 3659
[pid  3659] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3659] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3659] setpgid(0, 0)               = 0
[pid  3659] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3659] write(3, "1000", 4)         = 4
[pid  3659] close(3)                    = 0
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3659] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3659] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3659] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3660], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3660
./strace-static-x86_64: Process 3660 attached
[pid  3660] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] <... futex resumed>)        = 0
[pid  3660] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3659] <... futex resumed>)        = 1
[pid  3660] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 EAGAIN (Resource temporarily unavailable)
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3659] <... futex resumed>)        = 1
[pid  3660] socket(AF_INET, SOCK_STREAM, IPPROTO_IP <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] <... socket resumed>)       = 5
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] <... futex resumed>)        = 0
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3660] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3659] <... futex resumed>)        = 1
[   52.518284][ T3658] debugfs: out of free dentries, can not create directory 'nbd0'
[   52.518420][   T48] block nbd0: Receive control failed (result -107)
[   52.518493][   T48] block nbd0: Receive control failed (result -32)
[   52.542559][ T3658] block nbd0: shutting down sockets
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] <... ioctl resumed>)        = 0
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3659] <... futex resumed>)        = 0
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] ioctl(4, NBD_SET_SOCK, 5)   = 0
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] <... futex resumed>)        = 0
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = 0
[pid  3659] <... futex resumed>)        = 1
[pid  3660] 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|NBD_FLAG_SEND_CACHE <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] <... ioctl resumed>)        = 0
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3659] <... futex resumed>)        = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3659] <... futex resumed>)        = 0
[pid  3660] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] <... openat resumed>)       = 6
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3659] <... futex resumed>)        = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3660] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3659] <... futex resumed>)        = 0
[pid  3660] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3659] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3660] <... openat resumed>)       = 7
[pid  3660] write(7, "5", 1)            = 1
[pid  3660] ioctl(6, NBD_DO_IT)         = 0
[pid  3660] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3659] <... futex resumed>)        = 0
[pid  3660] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3659] exit_group(0 <unfinished ...>
[pid  3660] <... futex resumed>)        = ?
[pid  3659] <... exit_group resumed>)   = ?
[pid  3660] +++ exited with 0 +++
[pid  3659] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3659, 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=0x555555e5b5d0) = 3661
./strace-static-x86_64: Process 3661 attached
[pid  3661] set_robust_list(0x555555e5b5e0, 24) = 0
[pid  3661] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid  3661] setpgid(0, 0)               = 0
[pid  3661] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid  3661] write(3, "1000", 4)         = 4
[pid  3661] close(3)                    = 0
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3661] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3661] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3662], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3662
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3662 attached
 <unfinished ...>
[pid  3662] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3662] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = 0
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... futex resumed>)        = 1
[pid  3662] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = 0
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... futex resumed>)        = 1
[pid  3662] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3661] <... futex resumed>)        = 0
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... futex resumed>)        = 1
[pid  3662] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3661] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[pid  3661] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd30000
[pid  3661] mprotect(0x7f21afd31000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3661] clone(child_stack=0x7f21afd503f0, 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=0x7f21afd50700, child_tidptr=0x7f21afd509d0) = 3663
[pid  3661] futex(0x7f21afe484f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3661] futex(0x7f21afe484fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3663 attached
 <unfinished ...>
[   52.655357][ T3660] debugfs: out of free dentries, can not create directory 'nbd0'
[   52.655499][ T3605] block nbd0: Receive control failed (result -107)
[   52.655675][ T3605] block nbd0: Receive control failed (result -32)
[   52.661920][ T3659] block nbd0: shutting down sockets
[pid  3663] set_robust_list(0x7f21afd509e0, 24) = 0
[pid  3663] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3662] <... ioctl resumed>)        = 0
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3662] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3663] <... ioctl resumed>)        = -1 EBUSY (Device or resource busy)
[pid  3663] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3661] <... futex resumed>)        = 0
[pid  3663] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... futex resumed>)        = 0
[pid  3662] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3661] <... futex resumed>)        = 0
[pid  3662] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3662] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3661] <... futex resumed>)        = 0
[pid  3662] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... openat resumed>)       = 6
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3661] <... futex resumed>)        = 0
[pid  3662] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3661] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3662] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3661] <... futex resumed>)        = 0
[pid  3662] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3661] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3662] <... openat resumed>)       = 7
[pid  3662] write(7, "5", 1)            = 1
[pid  3662] ioctl(6, NBD_DO_IT)         = 0
[pid  3662] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3661] <... futex resumed>)        = 0
[pid  3662] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3661] exit_group(0 <unfinished ...>
[pid  3663] <... futex resumed>)        = ?
[pid  3662] <... futex resumed>)        = ?
[pid  3661] <... exit_group resumed>)   = ?
[pid  3663] +++ exited with 0 +++
[pid  3662] +++ exited with 0 +++
[pid  3661] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3661, si_uid=0, si_status=0, si_utime=2, si_stime=2} ---
[   52.779968][ T3663] block nbd0: Device being setup by another task
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x555555e5b5d0) = 3664
./strace-static-x86_64: Process 3664 attached
[pid  3664] set_robust_list(0x555555e5b5e0, 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(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd51000
[pid  3664] mprotect(0x7f21afd52000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3664] clone(child_stack=0x7f21afd713f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3665], tls=0x7f21afd71700, child_tidptr=0x7f21afd719d0) = 3665
./strace-static-x86_64: Process 3665 attached
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] set_robust_list(0x7f21afd719e0, 24) = 0
[pid  3665] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3665] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[   52.822885][ T3662] kobject_add_internal failed for 0 (error: -12 parent: mq)
[   52.824631][   T48] block nbd0: Receive control failed (result -107)
[   52.830724][ T3604] block nbd0: shutting down sockets
[pid  3665] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 4
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 5
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3665] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... ioctl resumed>)        = 0
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3665] ioctl(4, NBD_SET_SOCK, 5 <unfinished ...>
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}) = -1 ETIMEDOUT (Connection timed out)
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=0}) = -1 ETIMEDOUT (Connection timed out)
[pid  3664] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] mmap(NULL, 135168, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f21afd30000
[pid  3664] mprotect(0x7f21afd31000, 131072, PROT_READ|PROT_WRITE) = 0
[pid  3664] clone(child_stack=0x7f21afd503f0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tid=[3666], tls=0x7f21afd50700, child_tidptr=0x7f21afd509d0) = 3666
[pid  3664] futex(0x7f21afe484f8, FUTEX_WAKE_PRIVATE, 1000000) = 0
[pid  3664] futex(0x7f21afe484fc, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000}./strace-static-x86_64: Process 3666 attached
 <unfinished ...>
[pid  3666] set_robust_list(0x7f21afd509e0, 24) = 0
[pid  3666] 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|NBD_FLAG_SEND_CACHE) = 0
[pid  3665] <... ioctl resumed>)        = 0
[pid  3666] futex(0x7f21afe484fc, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3666] <... futex resumed>)        = 1
[pid  3665] <... futex resumed>)        = 0
[pid  3664] <... futex resumed>)        = 0
[pid  3666] futex(0x7f21afe484f8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3665] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3664] <... futex resumed>)        = 0
[pid  3665] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY <unfinished ...>
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... openat resumed>)       = 6
[pid  3665] futex(0x7f21afe484ec, FUTEX_WAKE_PRIVATE, 1000000) = 1
[pid  3664] <... futex resumed>)        = 0
[pid  3665] futex(0x7f21afe484e8, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid  3664] futex(0x7f21afe484e8, FUTEX_WAKE_PRIVATE, 1000000 <unfinished ...>
[pid  3665] <... futex resumed>)        = -1 EAGAIN (Resource temporarily unavailable)
[pid  3664] <... futex resumed>)        = 0
[pid  3665] openat(AT_FDCWD, "/proc/thread-self/fail-nth", O_RDWR <unfinished ...>
[pid  3664] futex(0x7f21afe484ec, FUTEX_WAIT_PRIVATE, 0, {tv_sec=0, tv_nsec=50000000} <unfinished ...>
[pid  3665] <... openat resumed>)       = 7
[pid  3665] write(7, "5", 1)            = 1
[pid  3665] ioctl(6, NBD_DO_IT <unfinished ...>
[pid  3664] <... futex resumed>)        = -1 ETIMEDOUT (Connection timed out)
[   53.052096][ T3665] ------------[ cut here ]------------
[   53.052104][ T3665] kernfs: can not remove 'nr_tags', no directory
[   53.052201][ T3665] WARNING: CPU: 0 PID: 3665 at fs/kernfs/dir.c:1570 kernfs_remove_by_name_ns+0xb0/0xe0
[   53.073978][ T3665] Modules linked in:
[   53.077938][ T3665] CPU: 0 PID: 3665 Comm: syz-executor204 Not tainted 5.18.0-syzkaller-11972-gd1dc87763f40 #0
[   53.088281][ T3665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.099283][ T3665] RIP: 0010:kernfs_remove_by_name_ns+0xb0/0xe0
[   53.105599][ T3665] Code: 48 89 c3 e8 d2 91 6f ff 48 89 df e8 da e5 ff ff 31 db eb 29 e8 c1 91 6f ff 48 c7 c7 00 cd 9f 8a 4c 89 fe 31 c0 e8 30 29 38 ff <0f> 0b bb fe ff ff ff eb 12 e8 a2 91 6f ff bb fe ff ff ff 4c 89 e7
[   53.125783][ T3665] RSP: 0018:ffffc900030ef9a8 EFLAGS: 00010246
[   53.132007][ T3665] RAX: 93e5c4e07223da00 RBX: ffffffff8d141a00 RCX: ffff888020f1bb00
[   53.140166][ T3665] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[   53.148293][ T3665] RBP: dffffc0000000000 R08: ffffffff816bce0d R09: ffffed1017344f14
[   53.156439][ T3665] R10: ffffed1017344f14 R11: 1ffff11017344f13 R12: ffffffff8d1419c8
[   53.164717][ T3665] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8ae7dc20
[   53.172813][ T3665] FS:  00007f21afd71700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
[   53.181926][ T3665] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   53.188524][ T3665] CR2: 00007f21afdf67f0 CR3: 0000000073730000 CR4: 00000000003506f0
[pid  3664] exit_group(0)               = ?
[pid  3666] <... futex resumed>)        = ?
[pid  3666] +++ exited with 0 +++
[   53.196787][ T3665] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   53.204949][ T3665] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   53.213065][ T3665] Call Trace:
[   53.216478][ T3665]  <TASK>
[   53.219439][ T3665]  sysfs_remove_group+0x102/0x2b0
[   53.224662][ T3665]  sysfs_remove_groups+0x5b/0xb0
[   53.229718][ T3665]  __kobject_del+0x84/0x300
[   53.234518][ T3665]  kobject_del+0x41/0x60
[   53.238937][ T3665]  blk_mq_sysfs_unregister+0x235/0x320
[   53.244538][ T3665]  ? __blk_mq_register_dev+0x910/0x910
[   53.250204][ T3665]  ? elevator_switch_mq+0x583/0x6d0
[   53.255432][ T3665]  blk_mq_update_nr_hw_queues+0x637/0x12e0
[   53.261478][ T3665]  ? blk_mq_update_nr_requests+0x500/0x500
[   53.267302][ T3665]  ? blkdev_common_ioctl+0x6d6/0x2390
[   53.272803][ T3665]  ? mutex_lock_io_nested+0x60/0x60
[   53.278079][ T3665]  nbd_start_device+0x15d/0xb70
[   53.283092][ T3665]  ? bpf_lsm_capable+0x5/0x10
[   53.287797][ T3665]  ? security_capable+0xb1/0xd0
[   53.292798][ T3665]  nbd_ioctl+0x46f/0xba0
[   53.297248][ T3665]  ? nbd_release+0x130/0x130
[   53.301989][ T3665]  ? memset+0x1f/0x40
[   53.306000][ T3665]  ? smack_file_ioctl+0x298/0x3a0
[   53.311166][ T3665]  ? smack_file_alloc_security+0xd0/0xd0
[   53.316820][ T3665]  ? nbd_release+0x130/0x130
[   53.321580][ T3665]  blkdev_ioctl+0x3a6/0x760
[   53.326121][ T3665]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   53.331717][ T3665]  ? bpf_lsm_file_ioctl+0x5/0x10
[   53.336676][ T3665]  ? security_file_ioctl+0x9d/0xb0
[   53.341939][ T3665]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   53.347415][ T3665]  __se_sys_ioctl+0xfb/0x170
[   53.352128][ T3665]  do_syscall_64+0x2b/0x70
[   53.356560][ T3665]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   53.362637][ T3665] RIP: 0033:0x7f21afdc42a9
[   53.367070][ T3665] 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
[   53.386828][ T3665] RSP: 002b:00007f21afd712e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   53.395371][ T3665] RAX: ffffffffffffffda RBX: 00007f21afe484e0 RCX: 00007f21afdc42a9
[   53.403469][ T3665] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
[   53.411609][ T3665] RBP: 00007f21afe15184 R08: 0000000000000001 R09: 0000000000000035
[   53.419605][ T3665] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f21afe484ec
[   53.427726][ T3665] R13: 00007f21afd712f0 R14: 00007f21afe484e8 R15: 0000000000000001
[   53.435863][ T3665]  </TASK>
[   53.438909][ T3665] Kernel panic - not syncing: panic_on_warn set ...
[   53.445501][ T3665] CPU: 0 PID: 3665 Comm: syz-executor204 Not tainted 5.18.0-syzkaller-11972-gd1dc87763f40 #0
[   53.455649][ T3665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   53.465702][ T3665] Call Trace:
[   53.468976][ T3665]  <TASK>
[   53.471905][ T3665]  dump_stack_lvl+0x1e3/0x2cb
[   53.476597][ T3665]  ? bfq_pos_tree_add_move+0x436/0x436
[   53.482088][ T3665]  ? panic+0x76e/0x76e
[   53.486158][ T3665]  ? vscnprintf+0x59/0x80
[   53.490497][ T3665]  ? kernfs_remove_by_name_ns+0x70/0xe0
[   53.496038][ T3665]  panic+0x312/0x76e
[   53.499934][ T3665]  ? __warn+0x136/0x230
[   53.504087][ T3665]  ? fb_is_primary_device+0xcc/0xcc
[   53.509295][ T3665]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   53.514842][ T3665]  __warn+0x203/0x230
[   53.518820][ T3665]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   53.524371][ T3665]  report_bug+0x1b3/0x2d0
[   53.528712][ T3665]  handle_bug+0x3d/0x70
[   53.532866][ T3665]  exc_invalid_op+0x16/0x40
[   53.537365][ T3665]  asm_exc_invalid_op+0x1b/0x20
[   53.542216][ T3665] RIP: 0010:kernfs_remove_by_name_ns+0xb0/0xe0
[   53.548394][ T3665] Code: 48 89 c3 e8 d2 91 6f ff 48 89 df e8 da e5 ff ff 31 db eb 29 e8 c1 91 6f ff 48 c7 c7 00 cd 9f 8a 4c 89 fe 31 c0 e8 30 29 38 ff <0f> 0b bb fe ff ff ff eb 12 e8 a2 91 6f ff bb fe ff ff ff 4c 89 e7
[   53.567998][ T3665] RSP: 0018:ffffc900030ef9a8 EFLAGS: 00010246
[   53.574078][ T3665] RAX: 93e5c4e07223da00 RBX: ffffffff8d141a00 RCX: ffff888020f1bb00
[   53.582089][ T3665] RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
[   53.590074][ T3665] RBP: dffffc0000000000 R08: ffffffff816bce0d R09: ffffed1017344f14
[   53.598051][ T3665] R10: ffffed1017344f14 R11: 1ffff11017344f13 R12: ffffffff8d1419c8
[   53.606017][ T3665] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8ae7dc20
[   53.614428][ T3665]  ? __wake_up_klogd+0xcd/0x100
[   53.619552][ T3665]  ? kernfs_remove_by_name_ns+0xb0/0xe0
[   53.625096][ T3665]  sysfs_remove_group+0x102/0x2b0
[   53.630121][ T3665]  sysfs_remove_groups+0x5b/0xb0
[   53.635143][ T3665]  __kobject_del+0x84/0x300
[   53.639647][ T3665]  kobject_del+0x41/0x60
[   53.643883][ T3665]  blk_mq_sysfs_unregister+0x235/0x320
[   53.649342][ T3665]  ? __blk_mq_register_dev+0x910/0x910
[   53.654802][ T3665]  ? elevator_switch_mq+0x583/0x6d0
[   53.660004][ T3665]  blk_mq_update_nr_hw_queues+0x637/0x12e0
[   53.665823][ T3665]  ? blk_mq_update_nr_requests+0x500/0x500
[   53.671624][ T3665]  ? blkdev_common_ioctl+0x6d6/0x2390
[   53.676994][ T3665]  ? mutex_lock_io_nested+0x60/0x60
[   53.682285][ T3665]  nbd_start_device+0x15d/0xb70
[   53.687133][ T3665]  ? bpf_lsm_capable+0x5/0x10
[   53.691813][ T3665]  ? security_capable+0xb1/0xd0
[   53.696668][ T3665]  nbd_ioctl+0x46f/0xba0
[   53.701174][ T3665]  ? nbd_release+0x130/0x130
[   53.705763][ T3665]  ? memset+0x1f/0x40
[   53.709739][ T3665]  ? smack_file_ioctl+0x298/0x3a0
[   53.714761][ T3665]  ? smack_file_alloc_security+0xd0/0xd0
[   53.720399][ T3665]  ? nbd_release+0x130/0x130
[   53.724984][ T3665]  blkdev_ioctl+0x3a6/0x760
[   53.729497][ T3665]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   53.734955][ T3665]  ? bpf_lsm_file_ioctl+0x5/0x10
[   53.739904][ T3665]  ? security_file_ioctl+0x9d/0xb0
[   53.745009][ T3665]  ? blkdev_compat_ptr_ioctl+0xd0/0xd0
[   53.750464][ T3665]  __se_sys_ioctl+0xfb/0x170
[   53.755054][ T3665]  do_syscall_64+0x2b/0x70
[   53.759468][ T3665]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[   53.765356][ T3665] RIP: 0033:0x7f21afdc42a9
[   53.769885][ T3665] 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
[   53.789480][ T3665] RSP: 002b:00007f21afd712e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   53.797890][ T3665] RAX: ffffffffffffffda RBX: 00007f21afe484e0 RCX: 00007f21afdc42a9
[   53.805853][ T3665] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
[   53.813820][ T3665] RBP: 00007f21afe15184 R08: 0000000000000001 R09: 0000000000000035
[   53.821878][ T3665] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f21afe484ec
[   53.829845][ T3665] R13: 00007f21afd712f0 R14: 00007f21afe484e8 R15: 0000000000000001
[   53.837829][ T3665]  </TASK>
[   53.841166][ T3665] Kernel Offset: disabled
[   53.845526][ T3665] Rebooting in 86400 seconds..