[ 38.873862][ T26] audit: type=1800 audit(1553459467.665:25): pid=7810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.894472][ T26] audit: type=1800 audit(1553459467.665:26): pid=7810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.922771][ T26] audit: type=1800 audit(1553459467.665:27): pid=7810 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 38.978623][ T26] audit: type=1800 audit(1553459467.765:28): pid=7810 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.180' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 567.572949][ T1042] INFO: task syz-executor056:7962 blocked for more than 143 seconds. [ 567.581477][ T1042] Not tainted 5.1.0-rc1+ #35 [ 567.586756][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 567.595581][ T1042] syz-executor056 D27712 7962 7960 0x80000000 [ 567.601898][ T1042] Call Trace: [ 567.605246][ T1042] __schedule+0x817/0x1cc0 [ 567.609687][ T1042] ? __sched_text_start+0x8/0x8 [ 567.614594][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 567.619787][ T1042] schedule+0x92/0x180 [ 567.624004][ T1042] schedule_timeout+0x8ca/0xfd0 [ 567.629088][ T1042] ? wait_for_completion+0x294/0x440 [ 567.634528][ T1042] ? find_held_lock+0x35/0x130 [ 567.639409][ T1042] ? usleep_range+0x170/0x170 [ 567.644208][ T1042] ? kasan_check_write+0x14/0x20 [ 567.655796][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 567.661088][ T1042] ? wait_for_completion+0x294/0x440 [ 567.666501][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 567.671774][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 567.677141][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 567.682174][ T1042] ? kasan_check_read+0x11/0x20 [ 567.687135][ T1042] wait_for_completion+0x29c/0x440 [ 567.692304][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 567.697718][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 567.704270][ T1042] ? wake_up_q+0xf0/0xf0 [ 567.708502][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 567.714625][ T1042] exit_aio+0x321/0x3a0 [ 567.719200][ T1042] ? io_submit_one+0x1cf0/0x1cf0 [ 567.724207][ T1042] ? mutex_unlock+0xd/0x10 [ 567.728628][ T1042] mmput+0xcf/0x4c0 [ 567.734217][ T1042] do_exit+0x816/0x2fa0 [ 567.738432][ T1042] ? lock_downgrade+0x880/0x880 [ 567.743375][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 567.749711][ T1042] ? kasan_check_read+0x11/0x20 [ 567.754668][ T1042] ? mm_update_next_owner+0x640/0x640 [ 567.760170][ T1042] ? __x64_sys_io_submit+0x37d/0x580 [ 567.765646][ T1042] ? __ia32_sys_io_destroy+0x420/0x420 [ 567.771491][ T1042] ? kasan_check_write+0x14/0x20 [ 567.776548][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 567.782030][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 567.787569][ T1042] do_group_exit+0x135/0x370 [ 567.792175][ T1042] __x64_sys_exit_group+0x44/0x50 [ 567.797362][ T1042] do_syscall_64+0x103/0x610 [ 567.802110][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 567.808099][ T1042] RIP: 0033:0x43ee48 [ 567.812056][ T1042] Code: Bad RIP value. [ 567.816252][ T1042] RSP: 002b:00007fff8e32e6d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 567.824963][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48 [ 567.833041][ T1042] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 567.841062][ T1042] RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 567.849093][ T1042] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 567.857213][ T1042] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 567.865514][ T1042] [ 567.865514][ T1042] Showing all locks held in the system: [ 567.873396][ T1042] 1 lock held by khungtaskd/1042: [ 567.878402][ T1042] #0: 000000007cc2f508 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 567.887853][ T1042] 1 lock held by rsyslogd/7848: [ 567.892842][ T1042] #0: 0000000015d2aa86 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 567.901493][ T1042] 2 locks held by getty/7939: [ 567.906243][ T1042] #0: 00000000ec83f6bf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.915313][ T1042] #1: 00000000a172e19b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.925139][ T1042] 2 locks held by getty/7940: [ 567.929810][ T1042] #0: 000000009145da6d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.939377][ T1042] #1: 000000002af2e391 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.948993][ T1042] 2 locks held by getty/7941: [ 567.953712][ T1042] #0: 00000000b28c0b56 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.962717][ T1042] #1: 0000000063fe2eff (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.972260][ T1042] 2 locks held by getty/7942: [ 567.976971][ T1042] #0: 00000000f63b226f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.986075][ T1042] #1: 000000003c461d08 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.995675][ T1042] 2 locks held by getty/7943: [ 568.000510][ T1042] #0: 000000001bdf5c74 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.009527][ T1042] #1: 00000000d2953033 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.019126][ T1042] 2 locks held by getty/7944: [ 568.024005][ T1042] #0: 000000003b791d9d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.033002][ T1042] #1: 000000004d742590 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.042559][ T1042] 2 locks held by getty/7945: [ 568.047284][ T1042] #0: 00000000c985619f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.056376][ T1042] #1: 0000000058c90974 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.065986][ T1042] [ 568.068311][ T1042] ============================================= [ 568.068311][ T1042] [ 568.076762][ T1042] NMI backtrace for cpu 0 [ 568.081098][ T1042] CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 568.088663][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.098705][ T1042] Call Trace: [ 568.101983][ T1042] dump_stack+0x172/0x1f0 [ 568.106384][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 568.111681][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 568.117410][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 568.123379][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 568.129447][ T1042] watchdog+0x9b7/0xec0 [ 568.133614][ T1042] kthread+0x357/0x430 [ 568.137678][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 568.143310][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 568.149537][ T1042] ret_from_fork+0x3a/0x50 [ 568.154043][ T1042] Sending NMI from CPU 0 to CPUs 1: [ 568.159319][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x2/0x10 [ 568.160316][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 568.174429][ T1042] CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 568.181952][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.192097][ T1042] Call Trace: [ 568.195380][ T1042] dump_stack+0x172/0x1f0 [ 568.199801][ T1042] panic+0x2cb/0x65c [ 568.203678][ T1042] ? __warn_printk+0xf3/0xf3 [ 568.208359][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 568.214001][ T1042] ? ___preempt_schedule+0x16/0x18 [ 568.219090][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 568.225221][ T1042] ? nmi_trigger_cpumask_backtrace+0x1fa/0x236 [ 568.231365][ T1042] ? nmi_trigger_cpumask_backtrace+0x204/0x236 [ 568.237502][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 568.243753][ T1042] watchdog+0x9c8/0xec0 [ 568.247897][ T1042] kthread+0x357/0x430 [ 568.251941][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 568.257466][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 568.263686][ T1042] ret_from_fork+0x3a/0x50 [ 568.269110][ T1042] Kernel Offset: disabled [ 568.273596][ T1042] Rebooting in 86400 seconds..