./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor3848708859 <...> DUID 00:04:e6:bc:8e:bc:c3:7a:f3:fc:35:c5:a5:4f:9b:64:01:ce forked to background, child pid 3187 [ 22.551710][ T3188] 8021q: adding VLAN 0 to HW filter on device bond0 [ 22.561441][ T3188] eql: remember to turn off Van-Jacobson compression on your slave devices Starting sshd: OK syzkaller Warning: Permanently added '10.128.0.117' (ECDSA) to the list of known hosts. execve("./syz-executor3848708859", ["./syz-executor3848708859"], 0x7ffe34d894d0 /* 10 vars */) = 0 brk(NULL) = 0x555555899000 brk(0x555555899c40) = 0x555555899c40 arch_prctl(ARCH_SET_FS, 0x555555899300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor3848708859", 4096) = 28 brk(0x5555558bac40) = 0x5555558bac40 brk(0x5555558bb000) = 0x5555558bb000 mprotect(0x7fe533580000, 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 clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD./strace-static-x86_64: Process 3617 attached , child_tidptr=0x5555558995d0) = 3617 [pid 3617] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0 [pid 3617] setpgid(0, 0) = 0 [pid 3617] openat(AT_FDCWD, "/proc/self/oom_score_adj", O_WRONLY|O_CLOEXEC) = 3 [pid 3617] write(3, "1000", 4) = 4 [pid 3617] close(3) = 0 [pid 3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY) = 3 [pid 3617] socketpair(AF_UNIX, SOCK_STREAM, 0, [4, 5]) = 0 [pid 3617] ioctl(3, NBD_SET_SOCK, 4) = 0 [pid 3617] openat(AT_FDCWD, "/dev/nbd0", O_RDONLY|O_TRUNC) = 6 [pid 3617] ioctl(6, NBD_SET_SIZE_BLOCKS, 7) = 0 syzkaller login: [ 39.558158][ T3617] nbd0: detected capacity change from 0 to 14 [pid 3617] ioctl(3, NBD_DO_IT [pid 3616] kill(-3617, SIGKILL) = 0 [pid 3617] <... ioctl resumed>) = ? [pid 3616] kill(3617, SIGKILL) = 0 [ 44.500655][ T3617] block nbd0: shutting down sockets [pid 3616] openat(AT_FDCWD, "/sys/fs/fuse/connections", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3 [pid 3616] fstat(3, {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0 [pid 3616] getdents64(3, 0x55555589a620 /* 2 entries */, 32768) = 48 [pid 3616] getdents64(3, 0x55555589a620 /* 0 entries */, 32768) = 0 [pid 3616] close(3) = 0 [ 69.806586][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 30 seconds [ 76.206903][ T14] cfg80211: failed to load regulatory.db [ 99.886585][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 60 seconds [ 101.611370][ T2975] udevd[2975]: worker [3619] /devices/virtual/block/nbd0 is taking a long time [ 129.966601][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 90 seconds [ 160.046591][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 120 seconds [ 190.126662][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 150 seconds [ 220.206590][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 180 seconds [ 222.345986][ T2975] udevd[2975]: worker [3619] /devices/virtual/block/nbd0 timeout; kill it [ 222.354790][ T2975] udevd[2975]: seq 7480 '/devices/virtual/block/nbd0' killed [ 250.286644][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 210 seconds [ 280.366629][ T9] block nbd0: Possible stuck request ffff88801e370000: control (read@0,4096B). Runtime 240 seconds [ 286.126687][ T28] INFO: task syz-executor384:3617 blocked for more than 143 seconds. [ 286.134911][ T28] Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 [ 286.142145][ T28] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 286.150913][ T28] task:syz-executor384 state:D stack:27632 pid:3617 ppid:3616 flags:0x00004006 [ 286.160418][ T28] Call Trace: [ 286.163731][ T28] [ 286.167008][ T28] __schedule+0xae5/0x52c0 [ 286.171625][ T28] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 286.178021][ T28] ? rcu_read_lock_sched_held+0xd/0x70 [ 286.183517][ T28] ? lock_release+0x560/0x780 [ 286.188339][ T28] ? io_schedule_timeout+0x140/0x140 [ 286.193663][ T28] ? rwlock_bug.part.0+0x90/0x90 [ 286.198905][ T28] ? exit_to_user_mode_prepare+0x15f/0x250 [ 286.204733][ T28] schedule+0xda/0x1b0 [ 286.208950][ T28] schedule_preempt_disabled+0xf/0x20 [ 286.214340][ T28] __mutex_lock+0xa44/0x1350 [ 286.219138][ T28] ? blkdev_put+0xbc/0x770 [ 286.223693][ T28] ? mutex_lock_io_nested+0x1190/0x1190 [ 286.229409][ T28] ? locks_check_ctx_file_list+0x1d/0x110 [ 286.235377][ T28] ? do_raw_spin_unlock+0x171/0x230 [ 286.240783][ T28] ? _raw_spin_unlock+0x24/0x40 [ 286.245812][ T28] ? locks_remove_file+0x2f7/0x570 [ 286.251117][ T28] blkdev_put+0xbc/0x770 [ 286.255390][ T28] blkdev_close+0x64/0x80 [ 286.259997][ T28] __fput+0x27c/0xa90 [ 286.264140][ T28] ? blkdev_fsync+0xa0/0xa0 [ 286.268719][ T28] task_work_run+0xdd/0x1a0 [ 286.273306][ T28] do_exit+0xc3f/0x2b60 [ 286.277619][ T28] ? rcu_read_lock_sched_held+0xd/0x70 [ 286.283099][ T28] ? lock_release+0x560/0x780 [ 286.287914][ T28] ? lock_downgrade+0x6e0/0x6e0 [ 286.292781][ T28] ? get_signal+0x93b/0x2610 [ 286.297853][ T28] ? mm_update_next_owner+0x7b0/0x7b0 [ 286.303247][ T28] ? do_raw_spin_lock+0x120/0x2a0 [ 286.310285][ T28] ? rwlock_bug.part.0+0x90/0x90 [ 286.315270][ T28] do_group_exit+0xd0/0x2a0 [ 286.319967][ T28] get_signal+0x238c/0x2610 [ 286.324782][ T28] ? map_id_up+0x178/0x2f0 [ 286.329486][ T28] ? exit_signals+0x8b0/0x8b0 [ 286.334193][ T28] ? lock_release+0x560/0x780 [ 286.339034][ T28] ? __task_pid_nr_ns+0x168/0x4b0 [ 286.344093][ T28] ? lock_downgrade+0x6e0/0x6e0 [ 286.349270][ T28] arch_do_signal_or_restart+0x82/0x2300 [ 286.355008][ T28] ? from_kuid+0xc0/0xc0 [ 286.359482][ T28] ? __task_pid_nr_ns+0x18a/0x4b0 [ 286.364578][ T28] ? get_sigframe_size+0x10/0x10 [ 286.369720][ T28] ? ptrace_notify+0xfa/0x140 [ 286.374420][ T28] ? lock_downgrade+0x6e0/0x6e0 [ 286.379521][ T28] ? send_sig+0xfe/0x160 [ 286.383801][ T28] ? send_sig_info+0x140/0x140 [ 286.388625][ T28] ? trace_hardirqs_on+0x2d/0x120 [ 286.393751][ T28] exit_to_user_mode_prepare+0x15f/0x250 [ 286.399555][ T28] syscall_exit_to_user_mode+0x19/0x50 [ 286.405069][ T28] do_syscall_64+0x42/0xb0 [ 286.409611][ T28] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 286.415553][ T28] RIP: 0033:0x7fe5335136b9 [ 286.420145][ T28] RSP: 002b:00007ffebfc8f668 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 286.428679][ T28] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007fe5335136b9 [ 286.436760][ T28] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 [ 286.444751][ T28] RBP: 0000000000000000 R08: 00007ffebfc8f808 R09: 00007ffebfc8f808 [ 286.452863][ T28] R10: 00007ffebfc8f808 R11: 0000000000000246 R12: 00007fe5334d2740 [ 286.462893][ T28] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 286.471113][ T28] [ 286.474156][ T28] NMI backtrace for cpu 0 [ 286.478477][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 [ 286.490909][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 286.501054][ T28] Call Trace: [ 286.504321][ T28] [ 286.507241][ T28] dump_stack_lvl+0xcd/0x134 [ 286.511928][ T28] nmi_cpu_backtrace.cold+0x46/0x14f [ 286.517207][ T28] ? lapic_can_unplug_cpu+0x80/0x80 [ 286.522418][ T28] nmi_trigger_cpumask_backtrace+0x206/0x250 [ 286.528551][ T28] watchdog+0xcf7/0xfd0 [ 286.532754][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.538767][ T28] kthread+0x2e4/0x3a0 [ 286.542841][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 286.548558][ T28] ret_from_fork+0x1f/0x30 [ 286.552972][ T28] [ 286.556060][ T28] Sending NMI from CPU 0 to CPUs 1: [ 286.561315][ C1] NMI backtrace for cpu 1 [ 286.561327][ C1] CPU: 1 PID: 55 Comm: kworker/u4:4 Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 [ 286.561348][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 286.561360][ C1] Workqueue: events_unbound toggle_allocation_gate [ 286.561384][ C1] RIP: 0010:_raw_spin_unlock+0x2b/0x40 [ 286.561414][ C1] Code: 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 8e 1c d8 f7 48 89 ef e8 76 86 d8 f7 bf 01 00 00 00 e8 3c 50 cb f7 65 8b 05 95 03 7b 76 <85> c0 74 02 5d c3 e8 d4 09 79 f7 5d c3 0f 1f 84 00 00 00 00 00 55 [ 286.561433][ C1] RSP: 0018:ffffc90001567868 EFLAGS: 00000093 [ 286.561447][ C1] RAX: 0000000080000001 RBX: ffff8880b9b39f80 RCX: 0000000000000000 [ 286.561460][ C1] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001 [ 286.561471][ C1] RBP: ffff8880b9b39f80 R08: 0000000000000000 R09: ffff8880b9b39f83 [ 286.561483][ C1] R10: ffffed10173673f0 R11: 0000000000000000 R12: 00000000000f4240 [ 286.561495][ C1] R13: 0000000000000001 R14: ffffed101736740a R15: ffff88813fe23000 [ 286.561508][ C1] FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 [ 286.561524][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 286.561537][ C1] CR2: 000055850248a600 CR3: 000000000bc8e000 CR4: 00000000003506e0 [ 286.561549][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 286.561560][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 286.561571][ C1] Call Trace: [ 286.561576][ C1] [ 286.561582][ C1] newidle_balance+0x47c/0x1190 [ 286.561605][ C1] ? rcu_read_lock_sched_held+0xd/0x70 [ 286.561625][ C1] ? update_load_avg+0x1361/0x1c80 [ 286.561656][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 286.561681][ C1] ? load_balance+0x2fe0/0x2fe0 [ 286.561699][ C1] ? dequeue_entity+0x2ce/0x10f0 [ 286.561717][ C1] ? cpuacct_all_seq_show+0x520/0x520 [ 286.561739][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 286.561764][ C1] pick_next_task_fair+0x96/0x12e0 [ 286.561787][ C1] __schedule+0x426/0x52c0 [ 286.561807][ C1] ? trace_hardirqs_on+0x2d/0x120 [ 286.561825][ C1] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 286.561853][ C1] ? __mod_timer+0x83c/0xe30 [ 286.561880][ C1] ? io_schedule_timeout+0x140/0x140 [ 286.561902][ C1] ? debug_object_free+0x350/0x350 [ 286.561994][ C1] ? lock_acquire+0x480/0x570 [ 286.562015][ C1] schedule+0xda/0x1b0 [ 286.562035][ C1] schedule_timeout+0x14a/0x2a0 [ 286.562060][ C1] ? usleep_range_state+0x1b0/0x1b0 [ 286.562084][ C1] ? toggle_allocation_gate+0x100/0x390 [ 286.562103][ C1] ? destroy_timer_on_stack+0x20/0x20 [ 286.562127][ C1] ? _raw_spin_unlock_irqrestore+0x3d/0x70 [ 286.562159][ C1] ? prepare_to_wait_event+0xc8/0x6a0 [ 286.562182][ C1] toggle_allocation_gate+0x305/0x390 [ 286.562201][ C1] ? lock_release+0x780/0x780 [ 286.562220][ C1] ? wake_up_kfence_timer+0x20/0x20 [ 286.562237][ C1] ? trace_hardirqs_on+0x2d/0x120 [ 286.562255][ C1] ? prepare_to_wait_exclusive+0x2b0/0x2b0 [ 286.562277][ C1] ? read_word_at_a_time+0xe/0x20 [ 286.562296][ C1] ? strscpy+0xa1/0x2a0 [ 286.562315][ C1] process_one_work+0x991/0x1610 [ 286.562345][ C1] ? pwq_dec_nr_in_flight+0x2a0/0x2a0 [ 286.562374][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 286.562400][ C1] worker_thread+0x665/0x1080 [ 286.562429][ C1] ? __kthread_parkme+0x15f/0x220 [ 286.562450][ C1] ? process_one_work+0x1610/0x1610 [ 286.562477][ C1] kthread+0x2e4/0x3a0 [ 286.562498][ C1] ? kthread_complete_and_exit+0x40/0x40 [ 286.562522][ C1] ret_from_fork+0x1f/0x30 [ 286.562554][ C1] [ 286.562562][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.247 msecs [ 286.563310][ T28] Kernel panic - not syncing: hung_task: blocked tasks [ 286.929355][ T28] CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc2-next-20220823-syzkaller #0 [ 286.938647][ T28] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 286.948708][ T28] Call Trace: [ 286.951996][ T28] [ 286.954930][ T28] dump_stack_lvl+0xcd/0x134 [ 286.959542][ T28] panic+0x2c8/0x627 [ 286.963484][ T28] ? panic_print_sys_info.part.0+0x10b/0x10b [ 286.969487][ T28] ? lapic_can_unplug_cpu+0x80/0x80 [ 286.975251][ T28] ? preempt_schedule_thunk+0x16/0x18 [ 286.980647][ T28] ? watchdog.cold+0x135/0x426 [ 286.985474][ T28] watchdog.cold+0x146/0x426 [ 286.990108][ T28] ? proc_dohung_task_timeout_secs+0x80/0x80 [ 286.996287][ T28] kthread+0x2e4/0x3a0 [ 287.000384][ T28] ? kthread_complete_and_exit+0x40/0x40 [ 287.006033][ T28] ret_from_fork+0x1f/0x30 [ 287.010478][ T28] [ 287.013803][ T28] Kernel Offset: disabled [ 287.018148][ T28] Rebooting in 86400 seconds..