[ 37.849220][ T26] audit: type=1800 audit(1553648649.265:25): pid=7713 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.887681][ T26] audit: type=1800 audit(1553648649.265:26): pid=7713 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.923619][ T26] audit: type=1800 audit(1553648649.275:27): pid=7713 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.947047][ T26] audit: type=1800 audit(1553648649.275:28): pid=7713 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 '10.128.10.16' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 566.984703][ T1042] INFO: task syz-executor124:7867 blocked for more than 143 seconds. [ 566.993053][ T1042] Not tainted 5.1.0-rc2-next-20190326 #11 [ 566.999356][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 567.008123][ T1042] syz-executor124 D28216 7867 7865 0x80000000 [ 567.014965][ T1042] Call Trace: [ 567.018356][ T1042] __schedule+0x817/0x1cc0 [ 567.022759][ T1042] ? __sched_text_start+0x8/0x8 [ 567.027673][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 567.032755][ T1042] schedule+0x92/0x180 [ 567.036878][ T1042] schedule_timeout+0x717/0xc50 [ 567.041721][ T1042] ? wait_for_completion+0x294/0x440 [ 567.047099][ T1042] ? find_held_lock+0x35/0x130 [ 567.051850][ T1042] ? usleep_range+0x170/0x170 [ 567.056616][ T1042] ? kasan_check_write+0x14/0x20 [ 567.061562][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 567.066964][ T1042] ? wait_for_completion+0x294/0x440 [ 567.072235][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 567.077476][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 567.082755][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 567.087930][ T1042] ? kasan_check_read+0x11/0x20 [ 567.092851][ T1042] wait_for_completion+0x29c/0x440 [ 567.098003][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 567.103324][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 567.110029][ T1042] ? wake_up_q+0xf0/0xf0 [ 567.114322][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 567.120389][ T1042] exit_aio+0x321/0x3a0 [ 567.124573][ T1042] ? io_submit_one+0x1cf0/0x1cf0 [ 567.129501][ T1042] ? mutex_unlock+0xd/0x10 [ 567.133963][ T1042] mmput+0xcf/0x4c0 [ 567.137820][ T1042] do_exit+0x816/0x2fa0 [ 567.142027][ T1042] ? lock_downgrade+0x880/0x880 [ 567.147361][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 567.153591][ T1042] ? kasan_check_read+0x11/0x20 [ 567.158490][ T1042] ? mm_update_next_owner+0x640/0x640 [ 567.163848][ T1042] ? __x64_sys_io_submit+0x37d/0x580 [ 567.169194][ T1042] ? __ia32_sys_io_destroy+0x420/0x420 [ 567.174671][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 567.180119][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 567.185734][ T1042] do_group_exit+0x135/0x370 [ 567.190326][ T1042] __x64_sys_exit_group+0x44/0x50 [ 567.195390][ T1042] do_syscall_64+0x103/0x610 [ 567.199981][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 567.205915][ T1042] RIP: 0033:0x43ee88 [ 567.209810][ T1042] Code: Bad RIP value. [ 567.213870][ T1042] RSP: 002b:00007ffde0405ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 567.222322][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee88 [ 567.230368][ T1042] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 567.238453][ T1042] RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 567.246548][ T1042] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 567.254600][ T1042] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 567.262616][ T1042] [ 567.262616][ T1042] Showing all locks held in the system: [ 567.270496][ T1042] 1 lock held by khungtaskd/1042: [ 567.276015][ T1042] #0: 00000000c5ffa827 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 567.285519][ T1042] 1 lock held by rsyslogd/7751: [ 567.290353][ T1042] #0: 00000000212dd642 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 567.299033][ T1042] 2 locks held by getty/7842: [ 567.303762][ T1042] #0: 00000000c3aa090a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.312758][ T1042] #1: 00000000f2d73442 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.322379][ T1042] 2 locks held by getty/7843: [ 567.327090][ T1042] #0: 00000000a0e0b49e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.336074][ T1042] #1: 00000000b9473ea6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.345681][ T1042] 2 locks held by getty/7844: [ 567.350339][ T1042] #0: 00000000e13faf7d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.359435][ T1042] #1: 00000000d29a05ab (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.369073][ T1042] 2 locks held by getty/7845: [ 567.373759][ T1042] #0: 00000000d9037364 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.382823][ T1042] #1: 0000000071b2e103 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.392562][ T1042] 2 locks held by getty/7846: [ 567.397290][ T1042] #0: 0000000068e8aec1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.406762][ T1042] #1: 00000000183b6bd5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.416531][ T1042] 2 locks held by getty/7847: [ 567.421211][ T1042] #0: 0000000049877ed4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.430392][ T1042] #1: 00000000a09d1917 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.440108][ T1042] 2 locks held by getty/7848: [ 567.444830][ T1042] #0: 000000001416b8e6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 567.453760][ T1042] #1: 0000000034b20f5f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 567.463545][ T1042] [ 567.466315][ T1042] ============================================= [ 567.466315][ T1042] [ 567.474771][ T1042] NMI backtrace for cpu 1 [ 567.479193][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc2-next-20190326 #11 [ 567.488047][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 567.498117][ T1042] Call Trace: [ 567.501410][ T1042] dump_stack+0x172/0x1f0 [ 567.505918][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 567.511158][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 567.516785][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 567.522740][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 567.528631][ T1042] watchdog+0x9b7/0xec0 [ 567.532777][ T1042] kthread+0x357/0x430 [ 567.536853][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 567.542415][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 567.548693][ T1042] ret_from_fork+0x3a/0x50 [ 567.553300][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 567.558624][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 567.559972][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 567.573727][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc2-next-20190326 #11 [ 567.582398][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 567.592589][ T1042] Call Trace: [ 567.595866][ T1042] dump_stack+0x172/0x1f0 [ 567.600202][ T1042] panic+0x2cb/0x65c [ 567.604081][ T1042] ? __warn_printk+0xf3/0xf3 [ 567.608724][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 567.614362][ T1042] ? ___preempt_schedule+0x16/0x18 [ 567.619598][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 567.625775][ T1042] ? nmi_trigger_cpumask_backtrace+0x1fa/0x236 [ 567.632001][ T1042] ? nmi_trigger_cpumask_backtrace+0x204/0x236 [ 567.638162][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 567.644291][ T1042] watchdog+0x9c8/0xec0 [ 567.648428][ T1042] kthread+0x357/0x430 [ 567.652473][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 567.657989][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 567.664204][ T1042] ret_from_fork+0x3a/0x50 [ 567.669484][ T1042] Kernel Offset: disabled [ 567.673813][ T1042] Rebooting in 86400 seconds..