./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor539382893 <...> [ 28.721179][ T3214] dhcpcd-run-hook (3214) used greatest stack depth: 16656 bytes left forked to background, child pid 3210 [ 30.617192][ T3211] 8021q: adding VLAN 0 to HW filter on device bond0 [ 30.633345][ T3211] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.179' (ECDSA) to the list of known hosts. execve("./syz-executor539382893", ["./syz-executor539382893"], 0x7ffc815f00f0 /* 10 vars */) = 0 brk(NULL) = 0x555556950000 brk(0x555556950c40) = 0x555556950c40 arch_prctl(ARCH_SET_FS, 0x555556950300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor539382893", 4096) = 27 brk(0x555556971c40) = 0x555556971c40 brk(0x555556972000) = 0x555556972000 mprotect(0x7fef8b560000, 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 unshare(CLONE_NEWPID) = 0 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3633 attached , child_tidptr=0x5555569505d0) = 3633 [pid 3633] mount(NULL, "/sys/fs/fuse/connections", "fusectl", 0, NULL) = -1 EBUSY (Device or resource busy) [pid 3633] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3633] setsid() = 1 [pid 3633] prlimit64(0, RLIMIT_AS, {rlim_cur=204800*1024, rlim_max=204800*1024}, NULL) = 0 [pid 3633] prlimit64(0, RLIMIT_MEMLOCK, {rlim_cur=32768*1024, rlim_max=32768*1024}, NULL) = 0 [pid 3633] prlimit64(0, RLIMIT_FSIZE, {rlim_cur=139264*1024, rlim_max=139264*1024}, NULL) = 0 [pid 3633] prlimit64(0, RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1024*1024}, NULL) = 0 [pid 3633] prlimit64(0, RLIMIT_CORE, {rlim_cur=131072*1024, rlim_max=131072*1024}, NULL) = 0 [pid 3633] prlimit64(0, RLIMIT_NOFILE, {rlim_cur=256, rlim_max=256}, NULL) = 0 [pid 3633] unshare(CLONE_NEWNS) = 0 [pid 3633] mount(NULL, "/", NULL, MS_REC|MS_PRIVATE, NULL) = 0 [pid 3633] unshare(CLONE_NEWIPC) = 0 [pid 3633] unshare(CLONE_NEWCGROUP) = 0 [pid 3633] unshare(CLONE_NEWUTS) = 0 [pid 3633] unshare(CLONE_SYSVSEM) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/shmmax", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "16777216", 8) = 8 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/shmall", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "536870912", 9) = 9 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/shmmni", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "1024", 4) = 4 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/msgmax", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "8192", 4) = 4 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/msgmni", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "1024", 4) = 4 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/msgmnb", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "1024", 4) = 4 [pid 3633] close(3) = 0 [pid 3633] openat(AT_FDCWD, "/proc/sys/kernel/sem", O_WRONLY|O_CLOEXEC) = 3 [pid 3633] write(3, "1024 1048576 500 1024", 21) = 21 [pid 3633] close(3) = 0 [pid 3633] getpid() = 1 [pid 3633] capget({version=_LINUX_CAPABILITY_VERSION_3, pid=1}, {effective=1<reloc_mutex){+.+.}-{3:3}, at: btrfs_commit_transaction+0x13e8/0x3760 [ 54.685377][ T3633] [ 54.685377][ T3633] which lock already depends on the new lock. [ 54.685377][ T3633] [ 54.695770][ T3633] [ 54.695770][ T3633] the existing dependency chain (in reverse order) is: [ 54.704788][ T3633] [ 54.704788][ T3633] -> #5 (&fs_info->reloc_mutex){+.+.}-{3:3}: [ 54.712954][ T3633] lock_acquire+0x182/0x3c0 [ 54.717994][ T3633] __mutex_lock_common+0x1bd/0x26e0 [ 54.723729][ T3633] mutex_lock_nested+0x17/0x20 [ 54.729050][ T3633] btrfs_record_root_in_trans+0x153/0x180 [ 54.735288][ T3633] start_transaction+0x3af/0x1180 [ 54.740828][ T3633] btrfs_create_common+0x2c6/0x420 [ 54.746456][ T3633] path_openat+0x12d0/0x2df0 [ 54.751562][ T3633] do_filp_open+0x264/0x4f0 [ 54.756580][ T3633] do_sys_openat2+0x124/0x4e0 [ 54.761772][ T3633] __x64_sys_open+0x221/0x270 [ 54.767049][ T3633] do_syscall_64+0x3d/0xb0 [ 54.771976][ T3633] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 54.778412][ T3633] [ 54.778412][ T3633] -> #4 (btrfs_trans_num_extwriters){++++}-{0:0}: [ 54.787036][ T3633] lock_acquire+0x182/0x3c0 [ 54.792060][ T3633] join_transaction+0x19f/0xe60 [ 54.797451][ T3633] start_transaction+0x6fb/0x1180 [ 54.803090][ T3633] btrfs_create_common+0x2c6/0x420 [ 54.808736][ T3633] path_openat+0x12d0/0x2df0 [ 54.813860][ T3633] do_filp_open+0x264/0x4f0 [ 54.818895][ T3633] do_sys_openat2+0x124/0x4e0 [ 54.824107][ T3633] __x64_sys_open+0x221/0x270 [ 54.829302][ T3633] do_syscall_64+0x3d/0xb0 [ 54.834244][ T3633] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 54.840661][ T3633] [ 54.840661][ T3633] -> #3 (btrfs_trans_num_writers){++++}-{0:0}: [ 54.848999][ T3633] reacquire_held_locks+0x386/0x650 [ 54.854718][ T3633] lock_release+0x2e2/0x820 [ 54.859823][ T3633] sb_end_intwrite+0x1e/0x1a0 [ 54.865012][ T3633] __btrfs_end_transaction+0x388/0x790 [ 54.871070][ T3633] btrfs_dirty_inode+0x177/0x1c0 [ 54.876693][ T3633] file_update_time+0x3df/0x5d0 [ 54.882084][ T3633] btrfs_page_mkwrite+0x3a8/0xc80 [ 54.887618][ T3633] do_page_mkwrite+0x19e/0x5e0 [ 54.893019][ T3633] handle_mm_fault+0x1c63/0x3630 [ 54.898463][ T3633] do_user_addr_fault+0x69b/0xcb0 [ 54.904004][ T3633] exc_page_fault+0x7a/0x110 [ 54.909108][ T3633] asm_exc_page_fault+0x22/0x30 [ 54.914469][ T3633] [ 54.914469][ T3633] -> #2 (sb_pagefaults){.+.+}-{0:0}: [ 54.921956][ T3633] lock_acquire+0x182/0x3c0 [ 54.927068][ T3633] btrfs_page_mkwrite+0x1ea/0xc80 [ 54.932631][ T3633] do_page_mkwrite+0x19e/0x5e0 [ 54.937941][ T3633] handle_mm_fault+0x1c63/0x3630 [ 54.943424][ T3633] do_user_addr_fault+0x69b/0xcb0 [ 54.948975][ T3633] exc_page_fault+0x7a/0x110 [ 54.954086][ T3633] asm_exc_page_fault+0x22/0x30 [ 54.959459][ T3633] [ 54.959459][ T3633] -> #1 (&mm->mmap_lock#2){++++}-{3:3}: [ 54.967184][ T3633] lock_acquire+0x182/0x3c0 [ 54.972297][ T3633] __might_fault+0xb2/0x110 [ 54.977365][ T3633] _copy_to_user+0x26/0x130 [ 54.982405][ T3633] btrfs_ioctl_get_subvol_rootref+0x8cf/0xa90 [ 54.989100][ T3633] btrfs_ioctl+0xb7c/0xc10 [ 54.994039][ T3633] __se_sys_ioctl+0xfb/0x170 [ 54.999173][ T3633] do_syscall_64+0x3d/0xb0 [ 55.004125][ T3633] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 55.010546][ T3633] [ 55.010546][ T3633] -> #0 (btrfs-root-00){.+.+}-{3:3}: [ 55.018010][ T3633] validate_chain+0x1898/0x6ae0 [ 55.023391][ T3633] __lock_acquire+0x1292/0x1f60 [ 55.028864][ T3633] lock_acquire+0x182/0x3c0 [ 55.033913][ T3633] down_read_nested+0x3c/0x50 [ 55.039115][ T3633] btrfs_read_lock_root_node+0x2b4/0x400 [ 55.045270][ T3633] btrfs_search_slot+0x495/0x2fe0 [ 55.050817][ T3633] btrfs_update_root+0xf0/0xc60 [ 55.056175][ T3633] commit_fs_roots+0x4d3/0x710 [ 55.061449][ T3633] btrfs_commit_transaction+0x147f/0x3760 [ 55.067680][ T3633] sync_filesystem+0x1bc/0x220 [ 55.072960][ T3633] generic_shutdown_super+0x6b/0x310 [ 55.078767][ T3633] kill_anon_super+0x36/0x60 [ 55.083865][ T3633] btrfs_kill_super+0x3d/0x50 [ 55.089063][ T3633] deactivate_locked_super+0xa7/0xf0 [ 55.094866][ T3633] cleanup_mnt+0x494/0x520 [ 55.100070][ T3633] task_work_run+0x243/0x300 [ 55.105174][ T3633] do_exit+0x664/0x2070 [ 55.109843][ T3633] do_group_exit+0x1fd/0x2b0 [ 55.114946][ T3633] __x64_sys_exit_group+0x3b/0x40 [ 55.120488][ T3633] do_syscall_64+0x3d/0xb0 [ 55.125414][ T3633] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 55.131817][ T3633] [ 55.131817][ T3633] other info that might help us debug this: [ 55.131817][ T3633] [ 55.142031][ T3633] Chain exists of: [ 55.142031][ T3633] btrfs-root-00 --> btrfs_trans_num_extwriters --> &fs_info->reloc_mutex [ 55.142031][ T3633] [ 55.156356][ T3633] Possible unsafe locking scenario: [ 55.156356][ T3633] [ 55.163807][ T3633] CPU0 CPU1 [ 55.169164][ T3633] ---- ---- [ 55.174518][ T3633] lock(&fs_info->reloc_mutex); [ 55.179452][ T3633] lock(btrfs_trans_num_extwriters); [ 55.187340][ T3633] lock(&fs_info->reloc_mutex); [ 55.194802][ T3633] lock(btrfs-root-00); [ 55.199043][ T3633] [ 55.199043][ T3633] *** DEADLOCK *** [ 55.199043][ T3633] [ 55.207182][ T3633] 5 locks held by syz-executor539/3633: [ 55.212715][ T3633] #0: ffff8880733280e0 (&type->s_umount_key#44){+.+.}-{3:3}, at: deactivate_super+0x96/0xd0 [ 55.222895][ T3633] #1: ffff88807cebe3f0 (btrfs_trans_completed){.+.+}-{0:0}, at: btrfs_commit_transaction+0x130f/0x3760 [ 55.234024][ T3633] #2: ffff88807cebe3c8 (btrfs_trans_super_committed){.+.+}-{0:0}, at: btrfs_commit_transaction+0x133e/0x3760 [ 55.245668][ T3633] #3: ffff88807cebe3a0 (btrfs_trans_unblocked){.+.+}-{0:0}, at: btrfs_commit_transaction+0x136d/0x3760 [ 55.256813][ T3633] #4: ffff88807cebccc0 (&fs_info->reloc_mutex){+.+.}-{3:3}, at: btrfs_commit_transaction+0x13e8/0x3760 [ 55.268073][ T3633] [ 55.268073][ T3633] stack backtrace: [ 55.274046][ T3633] CPU: 1 PID: 3633 Comm: syz-executor539 Not tainted 6.1.0-rc6-syzkaller-00176-g08ad43d554ba #0 [ 55.284499][ T3633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 55.294654][ T3633] Call Trace: [ 55.297945][ T3633] [ 55.300874][ T3633] dump_stack_lvl+0x1b1/0x28e [ 55.305561][ T3633] ? nf_tcp_handle_invalid+0x62e/0x62e [ 55.311020][ T3633] ? print_circular_bug+0x13e/0x1c0 [ 55.316219][ T3633] check_noncircular+0x2cc/0x390 [ 55.321150][ T3633] ? add_chain_block+0x850/0x850 [ 55.326080][ T3633] ? lockdep_lock+0x102/0x290 [ 55.330752][ T3633] ? _find_first_zero_bit+0xe8/0x110 [ 55.336293][ T3633] validate_chain+0x1898/0x6ae0 [ 55.341145][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.346512][ T3633] ? validate_chain+0x177/0x6ae0 [ 55.351455][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.356924][ T3633] ? unwind_get_return_address+0x48/0x80 [ 55.363341][ T3633] ? hlock_conflict+0x54/0x1f0 [ 55.368360][ T3633] ? __bfs+0x369/0x700 [ 55.372442][ T3633] ? check_path+0x40/0x40 [ 55.376870][ T3633] ? noop_count+0x30/0x30 [ 55.381256][ T3633] ? validate_chain+0x177/0x6ae0 [ 55.386224][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.391607][ T3633] ? check_path+0x21/0x40 [ 55.395932][ T3633] ? check_noncircular+0x1aa/0x390 [ 55.401038][ T3633] ? add_chain_block+0x850/0x850 [ 55.405970][ T3633] ? lockdep_lock+0x102/0x290 [ 55.410638][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.416001][ T3633] ? lockdep_unlock+0x144/0x2e0 [ 55.420855][ T3633] ? lockdep_lock+0x290/0x290 [ 55.425540][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.430915][ T3633] ? _find_first_zero_bit+0xe8/0x110 [ 55.436216][ T3633] ? validate_chain+0x1478/0x6ae0 [ 55.441252][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.446629][ T3633] ? validate_chain+0x177/0x6ae0 [ 55.451573][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.457042][ T3633] ? reacquire_held_locks+0x650/0x650 [ 55.462411][ T3633] ? stack_trace_save+0x1e0/0x1e0 [ 55.467427][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.473062][ T3633] ? stack_trace_save+0x1e0/0x1e0 [ 55.478078][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.483719][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.489696][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.495324][ T3633] ? __stack_depot_save+0x41c/0x4a0 [ 55.500520][ T3633] ? trace_lock_release+0x95/0x220 [ 55.505627][ T3633] ? stack_trace_save+0x1e0/0x1e0 [ 55.510690][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.516313][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.522290][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.527926][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.533914][ T3633] ? __stack_depot_save+0x41c/0x4a0 [ 55.539205][ T3633] ? trace_lock_release+0x95/0x220 [ 55.544327][ T3633] ? stack_trace_save+0x1e0/0x1e0 [ 55.549359][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.554986][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.560971][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.566595][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.572577][ T3633] ? __stack_depot_save+0x41c/0x4a0 [ 55.577799][ T3633] ? stack_trace_save+0x1e0/0x1e0 [ 55.582903][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.588527][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.594689][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.600335][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.606318][ T3633] ? mark_lock+0x9a/0x350 [ 55.610641][ T3633] __lock_acquire+0x1292/0x1f60 [ 55.615495][ T3633] lock_acquire+0x182/0x3c0 [ 55.620006][ T3633] ? btrfs_read_lock_root_node+0x2b4/0x400 [ 55.625834][ T3633] ? read_lock_is_recursive+0x10/0x10 [ 55.631221][ T3633] ? _raw_spin_unlock_irqrestore+0xc1/0x120 [ 55.637130][ T3633] ? __lock_acquire+0x1f60/0x1f60 [ 55.642163][ T3633] ? __might_sleep+0xc0/0xc0 [ 55.646757][ T3633] ? stack_trace_save+0x104/0x1e0 [ 55.651798][ T3633] down_read_nested+0x3c/0x50 [ 55.656485][ T3633] ? btrfs_read_lock_root_node+0x2b4/0x400 [ 55.662302][ T3633] btrfs_read_lock_root_node+0x2b4/0x400 [ 55.667933][ T3633] ? btrfs_commit_transaction+0x147f/0x3760 [ 55.673822][ T3633] ? kill_anon_super+0x36/0x60 [ 55.678575][ T3633] ? btrfs_kill_super+0x3d/0x50 [ 55.683420][ T3633] btrfs_search_slot+0x495/0x2fe0 [ 55.688444][ T3633] ? btrfs_update_root+0xb9/0xc60 [ 55.693458][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.699080][ T3633] ? btrfs_find_item+0x560/0x560 [ 55.704010][ T3633] ? rcu_read_lock_sched_held+0x87/0x110 [ 55.709637][ T3633] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 55.715610][ T3633] ? kmem_cache_alloc+0x85/0x300 [ 55.720559][ T3633] btrfs_update_root+0xf0/0xc60 [ 55.725417][ T3633] ? __lock_acquire+0x1f60/0x1f60 [ 55.730443][ T3633] ? btrfs_set_root_node+0x330/0x330 [ 55.735736][ T3633] ? tag_get+0x4b/0x80 [ 55.739813][ T3633] ? __add_reloc_root+0x3a0/0x3a0 [ 55.744842][ T3633] ? do_raw_spin_unlock+0x134/0x8a0 [ 55.750040][ T3633] ? btrfs_set_root_node+0x23/0x330 [ 55.755257][ T3633] commit_fs_roots+0x4d3/0x710 [ 55.760051][ T3633] ? create_pending_snapshots+0x1e0/0x1e0 [ 55.765792][ T3633] ? do_raw_spin_unlock+0x134/0x8a0 [ 55.770990][ T3633] btrfs_commit_transaction+0x147f/0x3760 [ 55.776715][ T3633] ? btrfs_commit_transaction_async+0x440/0x440 [ 55.782951][ T3633] ? join_transaction+0xc45/0xe60 [ 55.787968][ T3633] ? join_transaction+0xc1f/0xe60 [ 55.792995][ T3633] ? btrfs_record_root_in_trans+0x8e/0x180 [ 55.798799][ T3633] ? start_transaction+0x3da/0x1180 [ 55.804015][ T3633] ? btrfs_sync_fs+0x11d/0x4a0 [ 55.808794][ T3633] sync_filesystem+0x1bc/0x220 [ 55.813590][ T3633] generic_shutdown_super+0x6b/0x310 [ 55.818874][ T3633] kill_anon_super+0x36/0x60 [ 55.823801][ T3633] btrfs_kill_super+0x3d/0x50 [ 55.828476][ T3633] deactivate_locked_super+0xa7/0xf0 [ 55.833776][ T3633] cleanup_mnt+0x494/0x520 [ 55.838198][ T3633] ? lockdep_hardirqs_on+0x8d/0x130 [ 55.843397][ T3633] task_work_run+0x243/0x300 [ 55.848430][ T3633] ? task_work_cancel+0x290/0x290 [ 55.853449][ T3633] ? do_exit+0x65f/0x2070 [ 55.858573][ T3633] do_exit+0x664/0x2070 [ 55.862737][ T3633] ? lockdep_hardirqs_on_prepare+0x428/0x790 [ 55.868731][ T3633] ? mm_update_next_owner+0x6d0/0x6d0 [ 55.874109][ T3633] ? print_irqtrace_events+0x220/0x220 [ 55.879590][ T3633] ? _raw_spin_unlock_irq+0x1f/0x40 [ 55.884872][ T3633] ? lockdep_hardirqs_on+0x8d/0x130 [ 55.890067][ T3633] do_group_exit+0x1fd/0x2b0 [ 55.894654][ T3633] __x64_sys_exit_group+0x3b/0x40 [ 55.899759][ T3633] do_syscall_64+0x3d/0xb0 [ 55.904252][ T3633] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 55.910135][ T3633] RIP: 0033:0x7fef8b4ec279 [ 55.914542][ T3633] Code: Unable to access opcode bytes at 0x7fef8b4ec24f. [ 55.921545][ T3633] RSP: 002b:00007ffebca0a078 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 55.929949][ T3633] RAX: ffffffffffffffda RBX: 00007fef8b566350 RCX: 00007fef8b4ec279 [ 55.937996][ T3633] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 [ 55.946233][ T3633] RBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007fef8b560e40 [ 55.954199][ T3633] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fef8b566350 [ 55.962180][ T3633] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 55.970148][ T3633] [pid 3633] +++ exited with 1 +++ --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=3633, si_uid=0, si_status=1, si_utime=2, si_stime=23} --- exit_group(0) = ? +++ exited with 0 +++