./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor489317141
<...>
Warning: Permanently added '10.128.1.108' (ED25519) to the list of known hosts.
execve("./syz-executor489317141", ["./syz-executor489317141"], 0x7ffe81e51980 /* 10 vars */) = 0
brk(NULL) = 0x55557e788000
brk(0x55557e788d00) = 0x55557e788d00
arch_prctl(ARCH_SET_FS, 0x55557e788380) = 0
set_tid_address(0x55557e788650) = 5090
set_robust_list(0x55557e788660, 24) = 0
rseq(0x55557e788ca0, 0x20, 0, 0x53053053) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
readlink("/proc/self/exe", "/root/syz-executor489317141", 4096) = 27
getrandom("\x17\xf5\x7f\x0d\xbf\x7c\x75\x58", 8, GRND_NONBLOCK) = 8
brk(NULL) = 0x55557e788d00
brk(0x55557e7a9d00) = 0x55557e7a9d00
brk(0x55557e7aa000) = 0x55557e7aa000
mprotect(0x7fab93063000, 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, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = -1 ENXIO (No such device or address)
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5091 attached
, child_tidptr=0x55557e788650) = 5091
[pid 5091] set_robust_list(0x55557e788660, 24) = 0
[pid 5091] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5091] setpgid(0, 0) = 0
[pid 5091] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5091] write(3, "1000", 4) = 4
[pid 5091] close(3) = 0
executing program
[pid 5091] write(1, "executing program\n", 18) = 18
[pid 5091] memfd_create("syzkaller", 0) = 3
[pid 5091] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5091] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5091] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5091] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5091] ioctl(4, LOOP_SET_FD, 3) = 0
[pid 5091] close(3) = 0
[pid 5091] close(4) = 0
[pid 5091] mkdir("./file0", 0777) = 0
[ 60.915273][ T5091] loop0: detected capacity change from 0 to 32768
[ 60.943291][ T5091] BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz-executor489 (5091)
[ 60.976696][ T5091] BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d
[ 60.989734][ T5091] BTRFS info (device loop0): using sha256 (sha256-avx2) checksum algorithm
[ 60.999511][ T5091] BTRFS info (device loop0): using free-space-tree
[pid 5091] mount("/dev/loop0", "./file0", "btrfs", 0, "") = 0
[pid 5091] openat(AT_FDCWD, "./file0", O_RDONLY|O_DIRECTORY) = 3
[pid 5091] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5091] ioctl(4, LOOP_CLR_FD) = 0
[pid 5091] close(4) = 0
[pid 5091] mkdir("./file1", 000) = 0
[pid 5091] mkdir("./bus", 000) = 0
[pid 5091] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = 0
[pid 5091] chdir("./bus") = 0
[ 61.176885][ T5091]
[ 61.179260][ T5091] ============================================
[ 61.185434][ T5091] WARNING: possible recursive locking detected
[ 61.191591][ T5091] 6.9.0-next-20240517-syzkaller #0 Not tainted
[ 61.197844][ T5091] --------------------------------------------
[ 61.204003][ T5091] syz-executor489/5091 is trying to acquire lock:
[ 61.210418][ T5091] ffff88802f7f2420 (sb_writers#4){.+.+}-{0:0}, at: ovl_copy_up_flags+0x1110/0x4470
[ 61.219751][ T5091]
[ 61.219751][ T5091] but task is already holding lock:
[ 61.227193][ T5091] ffff88802f7f2420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90
[ 61.236092][ T5091]
[ 61.236092][ T5091] other info that might help us debug this:
[ 61.244159][ T5091] Possible unsafe locking scenario:
[ 61.244159][ T5091]
[ 61.251642][ T5091] CPU0
[ 61.254914][ T5091] ----
[ 61.258188][ T5091] lock(sb_writers#4);
[ 61.262348][ T5091] lock(sb_writers#4);
[ 61.266533][ T5091]
[ 61.266533][ T5091] *** DEADLOCK ***
[ 61.266533][ T5091]
[ 61.274667][ T5091] May be due to missing lock nesting notation
[ 61.274667][ T5091]
[ 61.282984][ T5091] 3 locks held by syz-executor489/5091:
[ 61.288515][ T5091] #0: ffff8880241fe420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90
[ 61.297659][ T5091] #1: ffff88802f7f2420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90
[ 61.306896][ T5091] #2: ffff88807f0ea808 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x53/0x310
[ 61.317253][ T5091]
[ 61.317253][ T5091] stack backtrace:
[ 61.323146][ T5091] CPU: 1 PID: 5091 Comm: syz-executor489 Not tainted 6.9.0-next-20240517-syzkaller #0
[ 61.332701][ T5091] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
[ 61.342759][ T5091] Call Trace:
[ 61.346037][ T5091]
[ 61.348958][ T5091] dump_stack_lvl+0x241/0x360
[ 61.353651][ T5091] ? __pfx_dump_stack_lvl+0x10/0x10
[ 61.358849][ T5091] ? print_deadlock_bug+0x479/0x620
[ 61.364042][ T5091] ? _find_first_zero_bit+0xd4/0x100
[ 61.369338][ T5091] validate_chain+0x15c1/0x58e0
[ 61.374191][ T5091] ? __pfx_lockdep_hardirqs_on_prepare+0x10/0x10
[ 61.380534][ T5091] ? _raw_spin_unlock_irqrestore+0x8f/0x140
[ 61.386422][ T5091] ? lockdep_hardirqs_on+0x99/0x150
[ 61.391614][ T5091] ? __pfx_validate_chain+0x10/0x10
[ 61.396842][ T5091] ? _raw_spin_unlock_irqrestore+0xdd/0x140
[ 61.402733][ T5091] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 61.409056][ T5091] ? stack_trace_save+0x118/0x1d0
[ 61.414078][ T5091] ? stack_depot_save_flags+0x6e4/0x830
[ 61.419639][ T5091] ? kasan_save_track+0x51/0x80
[ 61.424491][ T5091] ? kasan_save_track+0x3f/0x80
[ 61.429333][ T5091] ? __kasan_kmalloc+0x98/0xb0
[ 61.434099][ T5091] ? kmalloc_trace_noprof+0x19c/0x2c0
[ 61.439463][ T5091] ? ovl_encode_real_fh+0xdf/0x410
[ 61.444586][ T5091] ? ovl_copy_up_flags+0xf32/0x4470
[ 61.449887][ T5091] ? ovl_tmpfile+0x262/0x6d0
[ 61.454486][ T5091] ? vfs_tmpfile+0x396/0x510
[ 61.459082][ T5091] ? do_tmpfile+0x156/0x340
[ 61.463576][ T5091] ? path_openat+0x2ab8/0x3280
[ 61.468419][ T5091] ? do_filp_open+0x235/0x490
[ 61.473270][ T5091] ? do_sys_openat2+0x13e/0x1d0
[ 61.478136][ T5091] ? __x64_sys_open+0x225/0x270
[ 61.482981][ T5091] ? do_syscall_64+0xf5/0x240
[ 61.487744][ T5091] ? mark_lock+0x9a/0x350
[ 61.492091][ T5091] __lock_acquire+0x1346/0x1fd0
[ 61.496967][ T5091] lock_acquire+0x1ed/0x550
[ 61.501470][ T5091] ? ovl_copy_up_flags+0x1110/0x4470
[ 61.506757][ T5091] ? __pfx_lock_acquire+0x10/0x10
[ 61.511797][ T5091] ? dput+0x81/0x2b0
[ 61.515871][ T5091] ? ovl_encode_real_fh+0x26c/0x410
[ 61.521073][ T5091] ? __pfx___might_resched+0x10/0x10
[ 61.526357][ T5091] ? ovl_encode_real_fh+0x26c/0x410
[ 61.531595][ T5091] ? __pfx_ovl_encode_real_fh+0x10/0x10
[ 61.537225][ T5091] ovl_start_write+0x11d/0x290
[ 61.541982][ T5091] ? ovl_copy_up_flags+0x1110/0x4470
[ 61.547269][ T5091] ovl_copy_up_flags+0x1110/0x4470
[ 61.552486][ T5091] ? __pfx_ovl_copy_up_flags+0x10/0x10
[ 61.557946][ T5091] ? __kasan_slab_alloc+0x66/0x80
[ 61.562971][ T5091] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 61.569056][ T5091] ? mark_lock+0x9a/0x350
[ 61.573427][ T5091] ? __lock_acquire+0x1346/0x1fd0
[ 61.578614][ T5091] ? from_vfsgid+0x6b/0x90
[ 61.583125][ T5091] ? inode_init_owner+0x1d2/0x360
[ 61.588320][ T5091] ovl_tmpfile+0x262/0x6d0
[ 61.592738][ T5091] ? __pfx_ovl_tmpfile+0x10/0x10
[ 61.597695][ T5091] ? _raw_spin_unlock+0x28/0x50
[ 61.602893][ T5091] ? d_alloc+0x142/0x190
[ 61.607217][ T5091] ? mode_strip_sgid+0xa1/0x1a0
[ 61.612064][ T5091] vfs_tmpfile+0x396/0x510
[ 61.616511][ T5091] do_tmpfile+0x156/0x340
[ 61.620838][ T5091] ? __pfx_do_tmpfile+0x10/0x10
[ 61.625681][ T5091] ? init_file+0x15c/0x200
[ 61.630101][ T5091] path_openat+0x2ab8/0x3280
[ 61.634722][ T5091] ? _raw_spin_unlock_irqrestore+0xdd/0x140
[ 61.640613][ T5091] ? __pfx__raw_spin_unlock_irqrestore+0x10/0x10
[ 61.646950][ T5091] ? mark_lock+0x9a/0x350
[ 61.651282][ T5091] ? __lock_acquire+0x1346/0x1fd0
[ 61.656305][ T5091] ? mark_lock+0x9a/0x350
[ 61.660631][ T5091] ? __lock_acquire+0x1346/0x1fd0
[ 61.665653][ T5091] ? __pfx_path_openat+0x10/0x10
[ 61.670596][ T5091] do_filp_open+0x235/0x490
[ 61.675272][ T5091] ? __pfx_do_filp_open+0x10/0x10
[ 61.680307][ T5091] ? _raw_spin_unlock+0x28/0x50
[ 61.685162][ T5091] ? alloc_fd+0x59d/0x640
[ 61.689491][ T5091] do_sys_openat2+0x13e/0x1d0
[ 61.694168][ T5091] ? __pfx_do_sys_openat2+0x10/0x10
[ 61.699384][ T5091] ? lockdep_hardirqs_on+0x99/0x150
[ 61.704697][ T5091] ? _raw_spin_unlock_irq+0x2e/0x50
[ 61.709893][ T5091] ? ptrace_notify+0x279/0x380
[ 61.714648][ T5091] __x64_sys_open+0x225/0x270
[ 61.719322][ T5091] ? __pfx___x64_sys_open+0x10/0x10
[ 61.724519][ T5091] ? do_syscall_64+0x102/0x240
[ 61.729277][ T5091] do_syscall_64+0xf5/0x240
[ 61.733774][ T5091] ? clear_bhb_loop+0x35/0x90
[ 61.738447][ T5091] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 61.744343][ T5091] RIP: 0033:0x7fab92feaba9
[ 61.748749][ T5091] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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
[ 61.768348][ T5091] RSP: 002b:00007ffd714aed18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
[pid 5091] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 4
[pid 5091] exit_group(0) = ?
[pid 5091] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5091, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=27 /* 0.27 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
[ 61.776757][ T5091] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fab92feaba9
[ 61.785242][ T5091] RDX: 0000000000000000 RSI: 0000000000410202 RDI: 0000000020000040
[ 61.793225][ T5091] RBP: 00007fab930635f0 R08: 000055557e7894c0 R09: 000055557e7894c0
[ 61.801286][ T5091] R10: 000055557e7894c0 R11: 0000000000000246 R12: 00007ffd714aed40
[ 61.809250][ T5091] R13: 00007ffd714aef68 R14: 431bde82d7b634db R15: 00007fab9303303b
[ 61.817234][ T5091]
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5111 attached
[pid 5111] set_robust_list(0x55557e788660, 24) = 0
[pid 5111] prctl(PR_SET_PDEATHSIG, SIGKILL
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5111
[pid 5111] <... prctl resumed>) = 0
[pid 5111] setpgid(0, 0) = 0
[pid 5111] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5111] write(3, "1000", 4) = 4
executing program
[pid 5111] close(3) = 0
[pid 5111] write(1, "executing program\n", 18) = 18
[pid 5111] memfd_create("syzkaller", 0) = 3
[pid 5111] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5111] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5111] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5111] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5111] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5111] ioctl(4, LOOP_CLR_FD) = 0
[pid 5111] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5111] close(4) = 0
[pid 5111] close(3) = 0
[pid 5111] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5111] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5111] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5111] chdir("./bus") = 0
[pid 5111] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5111] exit_group(0) = ?
[pid 5111] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5111, si_uid=0, si_status=0, si_utime=7 /* 0.07 s */, si_stime=11 /* 0.11 s */} ---
[ 62.187643][ T5111] overlay: filesystem on ./bus not supported as upperdir
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5114 attached
, child_tidptr=0x55557e788650) = 5114
[pid 5114] set_robust_list(0x55557e788660, 24) = 0
[pid 5114] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5114] setpgid(0, 0) = 0
[pid 5114] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5114] write(3, "1000", 4) = 4
[pid 5114] close(3) = 0
[pid 5114] write(1, "executing program\n", 18executing program
) = 18
[pid 5114] memfd_create("syzkaller", 0) = 3
[pid 5114] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5114] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5114] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5114] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5114] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5114] ioctl(4, LOOP_CLR_FD) = 0
[pid 5114] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5114] close(4) = 0
[pid 5114] close(3) = 0
[pid 5114] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5114] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5114] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5114] chdir("./bus") = 0
[pid 5114] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5114] exit_group(0) = ?
[pid 5114] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5114, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
[ 62.591803][ T5114] overlay: filesystem on ./bus not supported as upperdir
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5117 attached
, child_tidptr=0x55557e788650) = 5117
[pid 5117] set_robust_list(0x55557e788660, 24) = 0
[pid 5117] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5117] setpgid(0, 0) = 0
[pid 5117] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5117] write(3, "1000", 4executing program
) = 4
[pid 5117] close(3) = 0
[pid 5117] write(1, "executing program\n", 18) = 18
[pid 5117] memfd_create("syzkaller", 0) = 3
[pid 5117] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5117] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5117] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5117] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5117] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5117] ioctl(4, LOOP_CLR_FD) = 0
[pid 5117] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5117] close(4) = 0
[pid 5117] close(3) = 0
[pid 5117] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5117] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5117] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5117] chdir("./bus") = 0
[pid 5117] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5117] exit_group(0) = ?
[pid 5117] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5117, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=16 /* 0.16 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 62.951505][ T5117] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5121 attached
, child_tidptr=0x55557e788650) = 5121
[pid 5121] set_robust_list(0x55557e788660, 24) = 0
[pid 5121] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5121] setpgid(0, 0) = 0
[pid 5121] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5121] write(3, "1000", 4) = 4
[pid 5121] close(3) = 0
executing program
[pid 5121] write(1, "executing program\n", 18) = 18
[pid 5121] memfd_create("syzkaller", 0) = 3
[pid 5121] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5121] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5121] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5121] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5121] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5121] ioctl(4, LOOP_CLR_FD) = 0
[pid 5121] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5121] close(4) = 0
[pid 5121] close(3) = 0
[pid 5121] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5121] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5121] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5121] chdir("./bus") = 0
[pid 5121] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5121] exit_group(0) = ?
[pid 5121] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5121, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=15 /* 0.15 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5123 attached
, child_tidptr=0x55557e788650) = 5123
[pid 5123] set_robust_list(0x55557e788660, 24) = 0
[ 63.271510][ T5121] overlay: filesystem on ./bus not supported as upperdir
[pid 5123] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5123] setpgid(0, 0) = 0
[pid 5123] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5123] write(3, "1000", 4) = 4
[pid 5123] close(3) = 0
executing program
[pid 5123] write(1, "executing program\n", 18) = 18
[pid 5123] memfd_create("syzkaller", 0) = 3
[pid 5123] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5123] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5123] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5123] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5123] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5123] ioctl(4, LOOP_CLR_FD) = 0
[pid 5123] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5123] close(4) = 0
[pid 5123] close(3) = 0
[pid 5123] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5123] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5123] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5123] chdir("./bus") = 0
[pid 5123] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5123] exit_group(0) = ?
[pid 5123] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5123, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=12 /* 0.12 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5126 attached
, child_tidptr=0x55557e788650) = 5126
[pid 5126] set_robust_list(0x55557e788660, 24) = 0
[pid 5126] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5126] setpgid(0, 0) = 0
[pid 5126] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[ 63.630216][ T5123] overlay: filesystem on ./bus not supported as upperdir
[pid 5126] write(3, "1000", 4) = 4
executing program
[pid 5126] close(3) = 0
[pid 5126] write(1, "executing program\n", 18) = 18
[pid 5126] memfd_create("syzkaller", 0) = 3
[pid 5126] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5126] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5126] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5126] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5126] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5126] ioctl(4, LOOP_CLR_FD) = 0
[pid 5126] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5126] close(4) = 0
[pid 5126] close(3) = 0
[pid 5126] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5126] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5126] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5126] chdir("./bus") = 0
[pid 5126] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5126] exit_group(0) = ?
[pid 5126] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5126, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=14 /* 0.14 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5129 attached
, child_tidptr=0x55557e788650) = 5129
[pid 5129] set_robust_list(0x55557e788660, 24) = 0
[pid 5129] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5129] setpgid(0, 0) = 0
[ 63.973380][ T5126] overlay: filesystem on ./bus not supported as upperdir
[pid 5129] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
executing program
[pid 5129] write(3, "1000", 4) = 4
[pid 5129] close(3) = 0
[pid 5129] write(1, "executing program\n", 18) = 18
[pid 5129] memfd_create("syzkaller", 0) = 3
[pid 5129] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5129] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5129] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5129] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5129] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5129] ioctl(4, LOOP_CLR_FD) = 0
[pid 5129] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5129] close(4) = 0
[pid 5129] close(3) = 0
[pid 5129] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5129] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5129] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5129] chdir("./bus") = 0
[pid 5129] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5129] exit_group(0) = ?
[pid 5129] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5129, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=16 /* 0.16 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5132 attached
, child_tidptr=0x55557e788650) = 5132
[ 64.332070][ T5129] overlay: filesystem on ./bus not supported as upperdir
[pid 5132] set_robust_list(0x55557e788660, 24) = 0
[pid 5132] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5132] setpgid(0, 0) = 0
[pid 5132] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5132] write(3, "1000", 4) = 4
[pid 5132] close(3executing program
) = 0
[pid 5132] write(1, "executing program\n", 18) = 18
[pid 5132] memfd_create("syzkaller", 0) = 3
[pid 5132] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5132] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5132] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5132] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5132] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5132] ioctl(4, LOOP_CLR_FD) = 0
[pid 5132] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5132] close(4) = 0
[pid 5132] close(3) = 0
[pid 5132] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5132] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5132] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5132] chdir("./bus") = 0
[pid 5132] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5132] exit_group(0) = ?
[pid 5132] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5132, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=15 /* 0.15 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
[ 64.712137][ T5132] overlay: filesystem on ./bus not supported as upperdir
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5135 attached
[pid 5135] set_robust_list(0x55557e788660, 24) = 0
[pid 5135] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5135
[pid 5135] setpgid(0, 0) = 0
[pid 5135] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5135] write(3, "1000", 4) = 4
[pid 5135] close(3) = 0
executing program
[pid 5135] write(1, "executing program\n", 18) = 18
[pid 5135] memfd_create("syzkaller", 0) = 3
[pid 5135] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5135] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5135] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5135] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5135] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5135] ioctl(4, LOOP_CLR_FD) = 0
[pid 5135] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5135] close(4) = 0
[pid 5135] close(3) = 0
[pid 5135] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5135] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5135] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5135] chdir("./bus") = 0
[pid 5135] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5135] exit_group(0) = ?
[pid 5135] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5135, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=14 /* 0.14 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 65.104719][ T5135] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5138 attached
[pid 5138] set_robust_list(0x55557e788660, 24) = 0
[pid 5138] prctl(PR_SET_PDEATHSIG, SIGKILL
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5138
[pid 5138] <... prctl resumed>) = 0
[pid 5138] setpgid(0, 0) = 0
[pid 5138] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5138] write(3, "1000", 4) = 4
[pid 5138] close(3) = 0
[pid 5138] write(1, "executing program\n", 18executing program
) = 18
[pid 5138] memfd_create("syzkaller", 0) = 3
[pid 5138] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5138] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5138] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5138] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5138] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5138] ioctl(4, LOOP_CLR_FD) = 0
[pid 5138] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5138] close(4) = 0
[pid 5138] close(3) = 0
[pid 5138] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5138] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5138] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5138] chdir("./bus") = 0
[pid 5138] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5138] exit_group(0) = ?
[pid 5138] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5138, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
[ 65.465348][ T5138] overlay: filesystem on ./bus not supported as upperdir
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5142 attached
[pid 5142] set_robust_list(0x55557e788660, 24) = 0
[pid 5142] prctl(PR_SET_PDEATHSIG, SIGKILL
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5142
[pid 5142] <... prctl resumed>) = 0
[pid 5142] setpgid(0, 0) = 0
[pid 5142] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5142] write(3, "1000", 4) = 4
[pid 5142] close(3executing program
) = 0
[pid 5142] write(1, "executing program\n", 18) = 18
[pid 5142] memfd_create("syzkaller", 0) = 3
[pid 5142] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5142] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5142] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5142] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5142] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5142] ioctl(4, LOOP_CLR_FD) = 0
[pid 5142] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5142] close(4) = 0
[pid 5142] close(3) = 0
[pid 5142] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5142] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5142] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5142] chdir("./bus") = 0
[pid 5142] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5142] exit_group(0) = ?
[pid 5142] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5142, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 65.876594][ T5142] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5145 attached
, child_tidptr=0x55557e788650) = 5145
[pid 5145] set_robust_list(0x55557e788660, 24) = 0
[pid 5145] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5145] setpgid(0, 0) = 0
[pid 5145] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5145] write(3, "1000", 4) = 4
executing program
[pid 5145] close(3) = 0
[pid 5145] write(1, "executing program\n", 18) = 18
[pid 5145] memfd_create("syzkaller", 0) = 3
[pid 5145] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5145] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5145] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5145] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5145] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5145] ioctl(4, LOOP_CLR_FD) = 0
[pid 5145] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5145] close(4) = 0
[pid 5145] close(3) = 0
[pid 5145] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5145] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5145] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5145] chdir("./bus") = 0
[pid 5145] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5145] exit_group(0) = ?
[pid 5145] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5145, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=15 /* 0.15 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5147 attached
[pid 5147] set_robust_list(0x55557e788660, 24) = 0
[pid 5147] prctl(PR_SET_PDEATHSIG, SIGKILL
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5147
[pid 5147] <... prctl resumed>) = 0
[pid 5147] setpgid(0, 0) = 0
[ 66.293965][ T5145] overlay: filesystem on ./bus not supported as upperdir
[pid 5147] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5147] write(3, "1000", 4) = 4
executing program
[pid 5147] close(3) = 0
[pid 5147] write(1, "executing program\n", 18) = 18
[pid 5147] memfd_create("syzkaller", 0) = 3
[pid 5147] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5147] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5147] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5147] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5147] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5147] ioctl(4, LOOP_CLR_FD) = 0
[pid 5147] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5147] close(4) = 0
[pid 5147] close(3) = 0
[pid 5147] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5147] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5147] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5147] chdir("./bus") = 0
[pid 5147] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5147] exit_group(0) = ?
[pid 5147] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5147, si_uid=0, si_status=0, si_utime=2 /* 0.02 s */, si_stime=15 /* 0.15 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
[ 66.632146][ T5147] overlay: filesystem on ./bus not supported as upperdir
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5150 attached
, child_tidptr=0x55557e788650) = 5150
[pid 5150] set_robust_list(0x55557e788660, 24) = 0
[pid 5150] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5150] setpgid(0, 0) = 0
[pid 5150] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
executing program
[pid 5150] write(3, "1000", 4) = 4
[pid 5150] close(3) = 0
[pid 5150] write(1, "executing program\n", 18) = 18
[pid 5150] memfd_create("syzkaller", 0) = 3
[pid 5150] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5150] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5150] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5150] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5150] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5150] ioctl(4, LOOP_CLR_FD) = 0
[pid 5150] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5150] close(4) = 0
[pid 5150] close(3) = 0
[pid 5150] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5150] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5150] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5150] chdir("./bus") = 0
[pid 5150] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5150] exit_group(0) = ?
[pid 5150] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5150, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=15 /* 0.15 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
[ 67.018744][ T5150] overlay: filesystem on ./bus not supported as upperdir
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5153 attached
, child_tidptr=0x55557e788650) = 5153
[pid 5153] set_robust_list(0x55557e788660, 24) = 0
[pid 5153] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5153] setpgid(0, 0) = 0
[pid 5153] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5153] write(3, "1000", 4) = 4
executing program
[pid 5153] close(3) = 0
[pid 5153] write(1, "executing program\n", 18) = 18
[pid 5153] memfd_create("syzkaller", 0) = 3
[pid 5153] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5153] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5153] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5153] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5153] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5153] ioctl(4, LOOP_CLR_FD) = 0
[pid 5153] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5153] close(4) = 0
[pid 5153] close(3) = 0
[pid 5153] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5153] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5153] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5153] chdir("./bus") = 0
[pid 5153] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5153] exit_group(0) = ?
[pid 5153] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5153, si_uid=0, si_status=0, si_utime=3 /* 0.03 s */, si_stime=16 /* 0.16 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5156 attached
, child_tidptr=0x55557e788650) = 5156
[pid 5156] set_robust_list(0x55557e788660, 24) = 0
[pid 5156] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[ 67.405826][ T5153] overlay: filesystem on ./bus not supported as upperdir
[pid 5156] setpgid(0, 0) = 0
[pid 5156] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5156] write(3, "1000", 4) = 4
[pid 5156] close(3executing program
) = 0
[pid 5156] write(1, "executing program\n", 18) = 18
[pid 5156] memfd_create("syzkaller", 0) = 3
[pid 5156] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5156] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5156] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5156] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5156] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5156] ioctl(4, LOOP_CLR_FD) = 0
[pid 5156] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5156] close(4) = 0
[pid 5156] close(3) = 0
[pid 5156] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5156] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5156] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5156] chdir("./bus") = 0
[pid 5156] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5156] exit_group(0) = ?
[pid 5156] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5156, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=13 /* 0.13 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55557e788650) = 5160
./strace-static-x86_64: Process 5160 attached
[pid 5160] set_robust_list(0x55557e788660, 24) = 0
[pid 5160] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5160] setpgid(0, 0) = 0
[pid 5160] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[ 67.776189][ T5156] overlay: filesystem on ./bus not supported as upperdir
[pid 5160] write(3, "1000", 4) = 4
[pid 5160] close(3) = 0
[pid 5160] write(1, "executing program\n", 18executing program
) = 18
[pid 5160] memfd_create("syzkaller", 0) = 3
[pid 5160] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5160] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5160] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5160] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5160] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5160] ioctl(4, LOOP_CLR_FD) = 0
[pid 5160] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5160] close(4) = 0
[pid 5160] close(3) = 0
[pid 5160] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5160] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5160] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5160] chdir("./bus") = 0
[pid 5160] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5160] exit_group(0) = ?
[pid 5160] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5160, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 68.143862][ T5160] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5162 attached
, child_tidptr=0x55557e788650) = 5162
[pid 5162] set_robust_list(0x55557e788660, 24) = 0
[pid 5162] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5162] setpgid(0, 0) = 0
[pid 5162] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5162] write(3, "1000", 4) = 4
[pid 5162] close(3) = 0
executing program
[pid 5162] write(1, "executing program\n", 18) = 18
[pid 5162] memfd_create("syzkaller", 0) = 3
[pid 5162] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5162] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5162] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5162] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5162] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5162] ioctl(4, LOOP_CLR_FD) = 0
[pid 5162] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5162] close(4) = 0
[pid 5162] close(3) = 0
[pid 5162] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5162] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5162] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5162] chdir("./bus") = 0
[pid 5162] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5162] exit_group(0) = ?
[pid 5162] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5162, si_uid=0, si_status=0, si_utime=1 /* 0.01 s */, si_stime=17 /* 0.17 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5165 attached
, child_tidptr=0x55557e788650) = 5165
[pid 5165] set_robust_list(0x55557e788660, 24) = 0
[pid 5165] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5165] setpgid(0, 0) = 0
[pid 5165] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5165] write(3, "1000", 4) = 4
[pid 5165] close(3) = 0
executing program
[pid 5165] write(1, "executing program\n", 18) = 18
[pid 5165] memfd_create("syzkaller", 0) = 3
[pid 5165] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[ 68.553121][ T5162] overlay: filesystem on ./bus not supported as upperdir
[pid 5165] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5165] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5165] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5165] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5165] ioctl(4, LOOP_CLR_FD) = 0
[pid 5165] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5165] close(4) = 0
[pid 5165] close(3) = 0
[pid 5165] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5165] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5165] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5165] chdir("./bus") = 0
[pid 5165] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5165] exit_group(0) = ?
[pid 5165] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5165, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=16 /* 0.16 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5168 attached
[pid 5168] set_robust_list(0x55557e788660, 24) = 0
[pid 5168] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5168] setpgid(0, 0) = 0
[pid 5168] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5168
[pid 5168] <... openat resumed>) = 3
[ 68.898787][ T5165] overlay: filesystem on ./bus not supported as upperdir
[pid 5168] write(3, "1000", 4) = 4
[pid 5168] close(3) = 0
executing program
[pid 5168] write(1, "executing program\n", 18) = 18
[pid 5168] memfd_create("syzkaller", 0) = 3
[pid 5168] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5168] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5168] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5168] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5168] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5168] ioctl(4, LOOP_CLR_FD) = 0
[pid 5168] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5168] close(4) = 0
[pid 5168] close(3) = 0
[pid 5168] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5168] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5168] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5168] chdir("./bus") = 0
[pid 5168] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5168] exit_group(0) = ?
[pid 5168] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5168, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 69.267311][ T5168] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5171 attached
, child_tidptr=0x55557e788650) = 5171
[pid 5171] set_robust_list(0x55557e788660, 24) = 0
[pid 5171] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5171] setpgid(0, 0) = 0
[pid 5171] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
executing program
[pid 5171] write(3, "1000", 4) = 4
[pid 5171] close(3) = 0
[pid 5171] write(1, "executing program\n", 18) = 18
[pid 5171] memfd_create("syzkaller", 0) = 3
[pid 5171] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5171] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5171] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5171] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5171] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5171] ioctl(4, LOOP_CLR_FD) = 0
[pid 5171] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5171] close(4) = 0
[pid 5171] close(3) = 0
[pid 5171] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5171] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5171] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5171] chdir("./bus") = 0
[pid 5171] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5171] exit_group(0) = ?
[pid 5171] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5171, si_uid=0, si_status=0, si_utime=0, si_stime=20 /* 0.20 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5175 attached
, child_tidptr=0x55557e788650) = 5175
[pid 5175] set_robust_list(0x55557e788660, 24) = 0
[ 69.634150][ T5171] overlay: filesystem on ./bus not supported as upperdir
[pid 5175] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5175] setpgid(0, 0) = 0
[pid 5175] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5175] write(3, "1000", 4) = 4
[pid 5175] close(3) = 0
[pid 5175] write(1, "executing program\n", 18executing program
) = 18
[pid 5175] memfd_create("syzkaller", 0) = 3
[pid 5175] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5175] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5175] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5175] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5175] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5175] ioctl(4, LOOP_CLR_FD) = 0
[pid 5175] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5175] close(4) = 0
[pid 5175] close(3) = 0
[pid 5175] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5175] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5175] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5175] chdir("./bus") = 0
[pid 5175] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5175] exit_group(0) = ?
[pid 5175] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5175, si_uid=0, si_status=0, si_utime=4 /* 0.04 s */, si_stime=12 /* 0.12 s */} ---
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x55557e788650) = 5177
./strace-static-x86_64: Process 5177 attached
[pid 5177] set_robust_list(0x55557e788660, 24) = 0
[pid 5177] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[ 70.017788][ T5175] overlay: filesystem on ./bus not supported as upperdir
[pid 5177] setpgid(0, 0) = 0
[pid 5177] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5177] write(3, "1000", 4executing program
) = 4
[pid 5177] close(3) = 0
[pid 5177] write(1, "executing program\n", 18) = 18
[pid 5177] memfd_create("syzkaller", 0) = 3
[pid 5177] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5177] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5177] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5177] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5177] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5177] ioctl(4, LOOP_CLR_FD) = 0
[pid 5177] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5177] close(4) = 0
[pid 5177] close(3) = 0
[pid 5177] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5177] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5177] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5177] chdir("./bus") = 0
[pid 5177] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5177] exit_group(0) = ?
[pid 5177] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5177, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=14 /* 0.14 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
[ 70.337045][ T5177] overlay: filesystem on ./bus not supported as upperdir
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5180 attached
[pid 5180] set_robust_list(0x55557e788660, 24) = 0
[pid 5180] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5180] setpgid(0, 0) = 0
[pid 5180] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5090] <... clone resumed>, child_tidptr=0x55557e788650) = 5180
[pid 5180] write(3, "1000", 4) = 4
[pid 5180] close(3) = 0
executing program
[pid 5180] write(1, "executing program\n", 18) = 18
[pid 5180] memfd_create("syzkaller", 0) = 3
[pid 5180] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5180] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5180] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5180] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5180] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5180] ioctl(4, LOOP_CLR_FD) = 0
[pid 5180] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5180] close(4) = 0
[pid 5180] close(3) = 0
[pid 5180] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5180] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5180] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5180] chdir("./bus") = 0
[pid 5180] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5180] exit_group(0) = ?
[pid 5180] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5180, si_uid=0, si_status=0, si_utime=6 /* 0.06 s */, si_stime=14 /* 0.14 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5184 attached
, child_tidptr=0x55557e788650) = 5184
[pid 5184] set_robust_list(0x55557e788660, 24) = 0
[ 70.719425][ T5180] overlay: filesystem on ./bus not supported as upperdir
[pid 5184] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5184] setpgid(0, 0) = 0
[pid 5184] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[pid 5184] write(3, "1000", 4) = 4
executing program
[pid 5184] close(3) = 0
[pid 5184] write(1, "executing program\n", 18) = 18
[pid 5184] memfd_create("syzkaller", 0) = 3
[pid 5184] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000
[pid 5184] write(3, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"..., 16777216) = 16777216
[pid 5184] munmap(0x7fab8aa00000, 138412032) = 0
[pid 5184] openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 4
[pid 5184] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5184] ioctl(4, LOOP_CLR_FD) = 0
[pid 5184] ioctl(4, LOOP_SET_FD, 3) = -1 EBUSY (Device or resource busy)
[pid 5184] close(4) = 0
[pid 5184] close(3) = 0
[pid 5184] mkdir("./file1", 000) = -1 EEXIST (File exists)
[pid 5184] mkdir("./bus", 000) = -1 EEXIST (File exists)
[pid 5184] mount(NULL, "./bus", "overlay", 0, "workdir=./bus,lowerdir=./file0,upperdir=./file1,") = -1 EINVAL (Invalid argument)
[pid 5184] chdir("./bus") = 0
[pid 5184] open("./file0", O_RDWR|O_TRUNC|O_TMPFILE, 000) = 3
[pid 5184] exit_group(0) = ?
[pid 5184] +++ exited with 0 +++
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=5184, si_uid=0, si_status=0, si_utime=5 /* 0.05 s */, si_stime=15 /* 0.15 s */} ---
restart_syscall(<... resuming interrupted clone ...>) = 0
openat(AT_FDCWD, "/dev/loop0", O_RDWR) = 3
ioctl(3, LOOP_CLR_FD) = 0
close(3) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 5186 attached
, child_tidptr=0x55557e788650) = 5186
[pid 5186] set_robust_list(0x55557e788660, 24) = 0
[pid 5186] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid 5186] setpgid(0, 0) = 0
[pid 5186] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3
[ 71.082771][ T5184] overlay: filesystem on ./bus not supported as upperdir
[pid 5186] write(3, "1000", 4executing program
) = 4
[pid 5186] close(3) = 0
[pid 5186] write(1, "executing program\n", 18) = 18
[pid 5186] memfd_create("syzkaller", 0) = 3
[pid 5186] mmap(NULL, 138412032, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fab8aa00000