[ 37.721892][ T26] audit: type=1800 audit(1554534731.496:27): pid=7603 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.744351][ T26] audit: type=1800 audit(1554534731.506:28): pid=7603 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. [ 38.336241][ T26] audit: type=1800 audit(1554534732.186:29): pid=7603 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 [....] startpar: service(s) returned failure: ssh ...[?25l[?1c7[FAIL8[?25h[?0c failed! Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.125' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 525.509246][ T1041] INFO: task syz-executor720:7780 blocked for more than 143 seconds. [ 525.517595][ T1041] Not tainted 5.1.0-rc3+ #53 [ 525.523127][ T1041] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 525.532054][ T1041] syz-executor720 D28216 7780 7778 0x80000000 [ 525.538407][ T1041] Call Trace: [ 525.542127][ T1041] __schedule+0x817/0x1cc0 [ 525.546653][ T1041] ? __sched_text_start+0x8/0x8 [ 525.551879][ T1041] ? __lock_acquire+0x242a/0x3fb0 [ 525.556952][ T1041] schedule+0x92/0x180 [ 525.561251][ T1041] schedule_timeout+0x8ca/0xfd0 [ 525.567509][ T1041] ? wait_for_completion+0x294/0x440 [ 525.573149][ T1041] ? find_held_lock+0x35/0x130 [ 525.577983][ T1041] ? usleep_range+0x170/0x170 [ 525.582824][ T1041] ? kasan_check_write+0x14/0x20 [ 525.587877][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 525.593700][ T1041] ? wait_for_completion+0x294/0x440 [ 525.599105][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 525.604530][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 525.610027][ T1041] ? trace_hardirqs_on+0x67/0x230 [ 525.615266][ T1041] ? kasan_check_read+0x11/0x20 [ 525.620485][ T1041] wait_for_completion+0x29c/0x440 [ 525.625628][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 525.631314][ T1041] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 525.638713][ T1041] ? wake_up_q+0xf0/0xf0 [ 525.643246][ T1041] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 525.649513][ T1041] exit_aio+0x321/0x3a0 [ 525.653702][ T1041] ? aio_poll_wake+0x11e0/0x11e0 [ 525.658771][ T1041] ? mutex_unlock+0xd/0x10 [ 525.663461][ T1041] mmput+0xcf/0x4c0 [ 525.667507][ T1041] do_exit+0x816/0x2fa0 [ 525.671891][ T1041] ? lock_downgrade+0x880/0x880 [ 525.676850][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 525.683316][ T1041] ? kasan_check_read+0x11/0x20 [ 525.688203][ T1041] ? mm_update_next_owner+0x640/0x640 [ 525.693786][ T1041] ? __x64_sys_io_submit+0x37d/0x580 [ 525.709751][ T1041] ? __ia32_sys_io_destroy+0x420/0x420 [ 525.715334][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 525.720935][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 525.726552][ T1041] do_group_exit+0x135/0x370 [ 525.731301][ T1041] __x64_sys_exit_group+0x44/0x50 [ 525.736493][ T1041] do_syscall_64+0x103/0x610 [ 525.741258][ T1041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 525.747483][ T1041] RIP: 0033:0x43ef58 [ 525.751595][ T1041] Code: Bad RIP value. [ 525.756562][ T1041] RSP: 002b:00007ffdf42a00f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 525.765439][ T1041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef58 [ 525.773880][ T1041] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 525.782072][ T1041] RBP: 00000000004be768 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 525.790524][ T1041] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 525.798731][ T1041] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 525.806932][ T1041] [ 525.806932][ T1041] Showing all locks held in the system: [ 525.815170][ T1041] 1 lock held by khungtaskd/1041: [ 525.820707][ T1041] #0: 000000000e653ba5 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 525.831608][ T1041] 1 lock held by rsyslogd/7641: [ 525.836562][ T1041] #0: 00000000a44d2a28 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 525.845864][ T1041] 2 locks held by getty/7753: [ 525.850668][ T1041] #0: 00000000b52f0b6a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.861040][ T1041] #1: 00000000d15045ce (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.872572][ T1041] 2 locks held by getty/7754: [ 525.877345][ T1041] #0: 00000000e560b9dd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.886421][ T1041] #1: 000000001565152b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.896130][ T1041] 2 locks held by getty/7755: [ 525.900958][ T1041] #0: 0000000037ab9e03 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.910538][ T1041] #1: 0000000042839adc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.920347][ T1041] 2 locks held by getty/7756: [ 525.925093][ T1041] #0: 00000000d4a9a70d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.934227][ T1041] #1: 000000005f457fde (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.944200][ T1041] 2 locks held by getty/7757: [ 525.949071][ T1041] #0: 000000001560fe56 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.958543][ T1041] #1: 00000000d465722d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.969280][ T1041] 2 locks held by getty/7758: [ 525.974930][ T1041] #0: 00000000b7f96a9c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.985116][ T1041] #1: 00000000ecd6c483 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.997134][ T1041] 2 locks held by getty/7759: [ 526.003236][ T1041] #0: 00000000c73ca2e7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 526.012996][ T1041] #1: 00000000829a8437 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 526.023886][ T1041] [ 526.026283][ T1041] ============================================= [ 526.026283][ T1041] [ 526.035380][ T1041] NMI backtrace for cpu 1 [ 526.039905][ T1041] CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc3+ #53 [ 526.047825][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 526.059304][ T1041] Call Trace: [ 526.062925][ T1041] dump_stack+0x172/0x1f0 [ 526.067414][ T1041] nmi_cpu_backtrace.cold+0x63/0xa4 [ 526.072930][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 526.078955][ T1041] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 526.085016][ T1041] arch_trigger_cpumask_backtrace+0x14/0x20 [ 526.091061][ T1041] watchdog+0x9b7/0xec0 [ 526.095324][ T1041] kthread+0x357/0x430 [ 526.099549][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 526.105342][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 526.111901][ T1041] ret_from_fork+0x3a/0x50 [ 526.116518][ T1041] Sending NMI from CPU 1 to CPUs 0: [ 526.121909][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 526.122856][ T1041] Kernel panic - not syncing: hung_task: blocked tasks [ 526.138247][ T1041] CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc3+ #53 [ 526.146410][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 526.157114][ T1041] Call Trace: [ 526.160621][ T1041] dump_stack+0x172/0x1f0 [ 526.165527][ T1041] panic+0x2cb/0x65c [ 526.169624][ T1041] ? __warn_printk+0xf3/0xf3 [ 526.174796][ T1041] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 526.180960][ T1041] ? printk_safe_flush+0xf2/0x140 [ 526.186093][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 526.192691][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 526.198510][ T1041] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 526.204828][ T1041] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 526.211001][ T1041] watchdog+0x9c8/0xec0 [ 526.215183][ T1041] kthread+0x357/0x430 [ 526.219277][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 526.225040][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 526.231936][ T1041] ret_from_fork+0x3a/0x50 [ 526.237484][ T1041] Kernel Offset: disabled [ 526.241889][ T1041] Rebooting in 86400 seconds..