[ 36.075674] audit: type=1800 audit(1549452111.003:27): pid=7463 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 36.097022] audit: type=1800 audit(1549452111.003:28): pid=7463 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. [ 37.158642] audit: type=1800 audit(1549452112.133:29): pid=7463 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 [ 37.178092] audit: type=1800 audit(1549452112.133:30): pid=7463 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 544.459998] INFO: task syz-executor521:7616 blocked for more than 140 seconds. [ 544.467803] Not tainted 5.0.0-rc5 #60 [ 544.472199] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 544.480309] syz-executor521 D28128 7616 7614 0xa0020000 [ 544.485969] Call Trace: [ 544.488644] __schedule+0x817/0x1cc0 [ 544.492437] ? trace_hardirqs_off+0x62/0x220 [ 544.496960] ? pci_mmcfg_check_reserved+0x170/0x170 [ 544.502102] ? mark_held_locks+0x100/0x100 [ 544.506449] schedule+0x92/0x180 [ 544.510263] schedule_timeout+0x8ca/0xfd0 [ 544.514398] ? wait_for_completion+0x294/0x440 [ 544.518962] ? find_held_lock+0x35/0x130 [ 544.523045] ? usleep_range+0x170/0x170 [ 544.527044] ? kasan_check_read+0x11/0x20 [ 544.531218] ? _raw_spin_unlock_irq+0x28/0x90 [ 544.535701] ? wait_for_completion+0x294/0x440 [ 544.540305] ? _raw_spin_unlock_irq+0x28/0x90 [ 544.544786] ? lockdep_hardirqs_on+0x415/0x5d0 [ 544.549348] ? trace_hardirqs_on+0x67/0x230 [ 544.553719] ? kasan_check_read+0x11/0x20 [ 544.557856] wait_for_completion+0x29c/0x440 [ 544.562310] ? lockdep_hardirqs_on+0x415/0x5d0 [ 544.566899] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 544.572779] ? wake_up_q+0x100/0x100 [ 544.576650] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 544.582011] exit_aio+0x321/0x3a0 [ 544.585469] ? io_submit_one+0x1cf0/0x1cf0 [ 544.589692] ? mutex_unlock+0xd/0x10 [ 544.593501] mmput+0xcf/0x4c0 [ 544.596629] do_exit+0x838/0x2fd0 [ 544.600138] ? mm_update_next_owner+0x660/0x660 [ 544.604815] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.610386] ? __ia32_compat_sys_io_submit+0x356/0x570 [ 544.615649] ? __ia32_sys_io_submit+0x560/0x560 [ 544.620511] ? __ia32_sys_memfd_create+0x1f9/0x470 [ 544.625486] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 544.630295] do_group_exit+0x135/0x370 [ 544.634173] __ia32_sys_exit_group+0x44/0x50 [ 544.638567] do_fast_syscall_32+0x281/0xc98 [ 544.643352] entry_SYSENTER_compat+0x70/0x7f [ 544.647749] RIP: 0023:0xf7f31869 [ 544.651178] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 544.670251] RSP: 002b:00000000ffb71e4c EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 544.677972] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080eb2b8 [ 544.685455] RDX: 0000000000000000 RSI: 00000000080d5bb8 RDI: 00000000080eb2c0 [ 544.692846] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 544.700241] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 544.707503] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 544.714866] [ 544.714866] Showing all locks held in the system: [ 544.721222] 1 lock held by khungtaskd/1040: [ 544.725532] #0: 000000000f60b317 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 544.734247] 1 lock held by rsyslogd/7502: [ 544.738394] #0: 00000000326d49bd (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 544.746411] 2 locks held by getty/7592: [ 544.750403] #0: 0000000029f92f93 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.758631] #1: 00000000775b9a7b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.767709] 2 locks held by getty/7593: [ 544.772131] #0: 00000000cc8f8870 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.780411] #1: 00000000f481ba9f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.789266] 2 locks held by getty/7594: [ 544.793333] #0: 0000000082b1bd6f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.801589] #1: 00000000312ba7a8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.810481] 2 locks held by getty/7595: [ 544.814443] #0: 00000000bb32c04a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.822737] #1: 00000000fb990b22 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.831600] 2 locks held by getty/7596: [ 544.835560] #0: 000000008e9dc577 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.843843] #1: 0000000050a3aca5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.852723] 2 locks held by getty/7597: [ 544.856685] #0: 000000005d0f1f6e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.864949] #1: 00000000f49cc79b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.873816] 2 locks held by getty/7598: [ 544.877768] #0: 00000000d8f3b837 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.886029] #1: 00000000c4ff860a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 544.894893] [ 544.896511] ============================================= [ 544.896511] [ 544.903957] NMI backtrace for cpu 0 [ 544.907581] CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc5 #60 [ 544.914328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 544.923660] Call Trace: [ 544.926268] dump_stack+0x172/0x1f0 [ 544.929934] nmi_cpu_backtrace.cold+0x63/0xa4 [ 544.934456] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 544.939493] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 544.944759] arch_trigger_cpumask_backtrace+0x14/0x20 [ 544.949929] watchdog+0x9df/0xee0 [ 544.953400] kthread+0x357/0x430 [ 544.956752] ? reset_hung_task_detector+0x30/0x30 [ 544.961576] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 544.967106] ret_from_fork+0x3a/0x50 [ 544.970874] Sending NMI from CPU 0 to CPUs 1: [ 544.975436] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x2/0x10 [ 544.976370] Kernel panic - not syncing: hung_task: blocked tasks [ 544.989105] CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc5 #60 [ 544.995913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 545.005245] Call Trace: [ 545.007810] dump_stack+0x172/0x1f0 [ 545.011419] panic+0x2cb/0x65c [ 545.014592] ? __warn_printk+0xf3/0xf3 [ 545.018465] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 545.023484] ? printk_safe_flush+0xf2/0x140 [ 545.027798] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 545.033313] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 545.038232] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 545.043661] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 545.049212] watchdog+0x9f0/0xee0 [ 545.052657] kthread+0x357/0x430 [ 545.056006] ? reset_hung_task_detector+0x30/0x30 [ 545.060834] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 545.066355] ret_from_fork+0x3a/0x50 [ 545.071196] Kernel Offset: disabled [ 545.074868] Rebooting in 86400 seconds..