[ 39.017652][ T26] audit: type=1800 audit(1554589477.781:26): pid=7630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.067165][ T26] audit: type=1800 audit(1554589477.801:27): pid=7630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 39.107483][ T26] audit: type=1800 audit(1554589477.821:28): pid=7630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.810016][ T26] audit: type=1800 audit(1554589479.611:29): pid=7630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.45' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 485.737113][ T1032] INFO: task syz-executor228:7782 blocked for more than 143 seconds. [ 485.745601][ T1032] Not tainted 5.1.0-rc3+ #56 [ 485.750846][ T1032] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 485.760885][ T1032] syz-executor228 D28216 7782 7780 0x80000000 [ 485.772508][ T1032] Call Trace: [ 485.775864][ T1032] __schedule+0x817/0x1cc0 [ 485.780346][ T1032] ? __sched_text_start+0x8/0x8 [ 485.785300][ T1032] ? __lock_acquire+0x242a/0x3fb0 [ 485.790394][ T1032] schedule+0x92/0x180 [ 485.794462][ T1032] schedule_timeout+0x8ca/0xfd0 [ 485.799372][ T1032] ? wait_for_completion+0x294/0x440 [ 485.804647][ T1032] ? find_held_lock+0x35/0x130 [ 485.809455][ T1032] ? usleep_range+0x170/0x170 [ 485.814255][ T1032] ? kasan_check_write+0x14/0x20 [ 485.819237][ T1032] ? _raw_spin_unlock_irq+0x28/0x90 [ 485.824420][ T1032] ? wait_for_completion+0x294/0x440 [ 485.829867][ T1032] ? _raw_spin_unlock_irq+0x28/0x90 [ 485.835060][ T1032] ? lockdep_hardirqs_on+0x418/0x5d0 [ 485.840420][ T1032] ? trace_hardirqs_on+0x67/0x230 [ 485.845434][ T1032] ? kasan_check_read+0x11/0x20 [ 485.850386][ T1032] wait_for_completion+0x29c/0x440 [ 485.855488][ T1032] ? lockdep_hardirqs_on+0x418/0x5d0 [ 485.861003][ T1032] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 485.867603][ T1032] ? wake_up_q+0xf0/0xf0 [ 485.871860][ T1032] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 485.878072][ T1032] exit_aio+0x321/0x3a0 [ 485.882221][ T1032] ? aio_poll_wake+0x11e0/0x11e0 [ 485.887271][ T1032] ? mutex_unlock+0xd/0x10 [ 485.891793][ T1032] mmput+0xcf/0x4c0 [ 485.895587][ T1032] do_exit+0x816/0x2fa0 [ 485.899819][ T1032] ? lock_downgrade+0x880/0x880 [ 485.904667][ T1032] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 485.910974][ T1032] ? kasan_check_read+0x11/0x20 [ 485.915816][ T1032] ? mm_update_next_owner+0x640/0x640 [ 485.921241][ T1032] ? __x64_sys_io_submit+0x37d/0x580 [ 485.926631][ T1032] ? __ia32_sys_io_destroy+0x420/0x420 [ 485.932204][ T1032] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 485.937687][ T1032] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 485.943249][ T1032] do_group_exit+0x135/0x370 [ 485.948150][ T1032] __x64_sys_exit_group+0x44/0x50 [ 485.953176][ T1032] do_syscall_64+0x103/0x610 [ 485.957895][ T1032] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 485.964125][ T1032] RIP: 0033:0x43ee98 [ 485.968100][ T1032] Code: 00 00 be 3c 00 00 00 eb 19 66 0f 1f 84 00 00 00 00 00 48 89 d7 89 f0 0f 05 48 3d 00 f0 ff ff 77 21 f4 48 89 d7 44 89 c0 0f 05 <48> 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 0f 1f 84 00 00 00 [ 485.987882][ T1032] RSP: 002b:00007ffcafc33e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 485.996298][ T1032] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee98 [ 486.004377][ T1032] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 486.012411][ T1032] RBP: 00000000004be6a8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 486.020573][ T1032] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 486.028884][ T1032] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 486.036932][ T1032] [ 486.036932][ T1032] Showing all locks held in the system: [ 486.044757][ T1032] 1 lock held by khungtaskd/1032: [ 486.050003][ T1032] #0: 000000009486fbb9 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 486.059408][ T1032] 1 lock held by rsyslogd/7668: [ 486.064252][ T1032] #0: 00000000460213db (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 486.072947][ T1032] 2 locks held by getty/7759: [ 486.077648][ T1032] #0: 000000000233dee1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.086602][ T1032] #1: 00000000a8f131e7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.096498][ T1032] 2 locks held by getty/7760: [ 486.101191][ T1032] #0: 000000004af553eb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.110350][ T1032] #1: 000000006f2ad7de (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.120122][ T1032] 2 locks held by getty/7761: [ 486.124805][ T1032] #0: 000000001a2b8d66 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.133853][ T1032] #1: 00000000da54f50f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.143907][ T1032] 2 locks held by getty/7762: [ 486.148667][ T1032] #0: 00000000d512e0a4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.157722][ T1032] #1: 0000000090ace895 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.167550][ T1032] 2 locks held by getty/7763: [ 486.172237][ T1032] #0: 000000002a43133d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.181463][ T1032] #1: 000000002d5f2782 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.191166][ T1032] 2 locks held by getty/7764: [ 486.195839][ T1032] #0: 00000000ad261fce (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.205343][ T1032] #1: 0000000023dffda9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.215075][ T1032] 2 locks held by getty/7765: [ 486.219864][ T1032] #0: 0000000049037daa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 486.228910][ T1032] #1: 0000000085214aaf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 486.238759][ T1032] [ 486.241118][ T1032] ============================================= [ 486.241118][ T1032] [ 486.249677][ T1032] NMI backtrace for cpu 1 [ 486.254061][ T1032] CPU: 1 PID: 1032 Comm: khungtaskd Not tainted 5.1.0-rc3+ #56 [ 486.261698][ T1032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 486.271925][ T1032] Call Trace: [ 486.275249][ T1032] dump_stack+0x172/0x1f0 [ 486.279609][ T1032] nmi_cpu_backtrace.cold+0x63/0xa4 [ 486.285006][ T1032] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 486.290653][ T1032] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 486.296761][ T1032] arch_trigger_cpumask_backtrace+0x14/0x20 [ 486.302665][ T1032] watchdog+0x9b7/0xec0 [ 486.306823][ T1032] kthread+0x357/0x430 [ 486.310891][ T1032] ? reset_hung_task_detector+0x30/0x30 [ 486.316422][ T1032] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 486.322700][ T1032] ret_from_fork+0x3a/0x50 [ 486.327327][ T1032] Sending NMI from CPU 1 to CPUs 0: [ 486.332634][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 486.333549][ T1032] Kernel panic - not syncing: hung_task: blocked tasks [ 486.347847][ T1032] CPU: 1 PID: 1032 Comm: khungtaskd Not tainted 5.1.0-rc3+ #56 [ 486.355675][ T1032] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 486.365922][ T1032] Call Trace: [ 486.369220][ T1032] dump_stack+0x172/0x1f0 [ 486.373537][ T1032] panic+0x2cb/0x65c [ 486.377422][ T1032] ? __warn_printk+0xf3/0xf3 [ 486.382105][ T1032] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 486.387823][ T1032] ? printk_safe_flush+0xf2/0x140 [ 486.392841][ T1032] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 486.399136][ T1032] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 486.404824][ T1032] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 486.411205][ T1032] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 486.417420][ T1032] watchdog+0x9c8/0xec0 [ 486.421663][ T1032] kthread+0x357/0x430 [ 486.425724][ T1032] ? reset_hung_task_detector+0x30/0x30 [ 486.431351][ T1032] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 486.437598][ T1032] ret_from_fork+0x3a/0x50 [ 486.442962][ T1032] Kernel Offset: disabled [ 486.447300][ T1032] Rebooting in 86400 seconds..