[ 37.149635][ T26] audit: type=1800 audit(1553459333.931:26): pid=7624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.177858][ T26] audit: type=1800 audit(1553459333.931:27): pid=7624 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.198810][ T26] audit: type=1800 audit(1553459333.941:28): pid=7624 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. [ 38.022039][ T26] audit: type=1800 audit(1553459334.841:29): pid=7624 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 '10.128.10.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 566.320335][ T1042] INFO: task syz-executor808:7778 blocked for more than 143 seconds. [ 566.328807][ T1042] Not tainted 5.1.0-rc1+ #35 [ 566.334041][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 566.342796][ T1042] syz-executor808 D28216 7778 7776 0x80000000 [ 566.349119][ T1042] Call Trace: [ 566.352570][ T1042] __schedule+0x817/0x1cc0 [ 566.357015][ T1042] ? __sched_text_start+0x8/0x8 [ 566.362033][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 566.367095][ T1042] schedule+0x92/0x180 [ 566.371245][ T1042] schedule_timeout+0x8ca/0xfd0 [ 566.376105][ T1042] ? wait_for_completion+0x294/0x440 [ 566.381512][ T1042] ? find_held_lock+0x35/0x130 [ 566.386285][ T1042] ? usleep_range+0x170/0x170 [ 566.391284][ T1042] ? kasan_check_write+0x14/0x20 [ 566.396249][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 566.401610][ T1042] ? wait_for_completion+0x294/0x440 [ 566.406931][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 566.412292][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 566.417739][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 566.422893][ T1042] ? kasan_check_read+0x11/0x20 [ 566.427757][ T1042] wait_for_completion+0x29c/0x440 [ 566.432951][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 566.438259][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 566.444972][ T1042] ? wake_up_q+0xf0/0xf0 [ 566.449267][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 566.455427][ T1042] exit_aio+0x321/0x3a0 [ 566.459747][ T1042] ? io_submit_one+0x1cf0/0x1cf0 [ 566.464916][ T1042] ? mutex_unlock+0xd/0x10 [ 566.469450][ T1042] mmput+0xcf/0x4c0 [ 566.473416][ T1042] do_exit+0x816/0x2fa0 [ 566.477587][ T1042] ? lock_downgrade+0x880/0x880 [ 566.482570][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 566.488839][ T1042] ? kasan_check_read+0x11/0x20 [ 566.493750][ T1042] ? mm_update_next_owner+0x640/0x640 [ 566.499128][ T1042] ? __x64_sys_io_submit+0x37d/0x580 [ 566.504492][ T1042] ? __ia32_sys_io_destroy+0x420/0x420 [ 566.509966][ T1042] ? kasan_check_write+0x14/0x20 [ 566.515084][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 566.520625][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 566.526095][ T1042] do_group_exit+0x135/0x370 [ 566.530800][ T1042] __x64_sys_exit_group+0x44/0x50 [ 566.535943][ T1042] do_syscall_64+0x103/0x610 [ 566.540745][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 566.546651][ T1042] RIP: 0033:0x43ee48 [ 566.550641][ T1042] Code: Bad RIP value. [ 566.554714][ T1042] RSP: 002b:00007ffe50baa0b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 566.563234][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48 [ 566.571260][ T1042] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 566.579220][ T1042] RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 566.587368][ T1042] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 566.595455][ T1042] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 566.603549][ T1042] [ 566.603549][ T1042] Showing all locks held in the system: [ 566.611335][ T1042] 1 lock held by khungtaskd/1042: [ 566.616343][ T1042] #0: 0000000052c47e17 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 566.625928][ T1042] 2 locks held by rsyslogd/7663: [ 566.631020][ T1042] #0: 0000000046d45a2c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 566.639653][ T1042] #1: 0000000098f3d4ad (&rq->lock){-.-.}, at: __schedule+0x1fc/0x1cc0 [ 566.648035][ T1042] 2 locks held by getty/7752: [ 566.652820][ T1042] #0: 00000000a55439e0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.661886][ T1042] #1: 0000000017516258 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.671786][ T1042] 2 locks held by getty/7753: [ 566.676455][ T1042] #0: 000000003602716c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.685528][ T1042] #1: 000000007d23e62c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.695190][ T1042] 2 locks held by getty/7754: [ 566.699856][ T1042] #0: 00000000770bceb9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.708994][ T1042] #1: 000000008d95985f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.718700][ T1042] 2 locks held by getty/7755: [ 566.723446][ T1042] #0: 00000000b95d821e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.732466][ T1042] #1: 0000000008543f63 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.742141][ T1042] 2 locks held by getty/7756: [ 566.746822][ T1042] #0: 000000000a7044e4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.755859][ T1042] #1: 00000000338a6a0e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.765517][ T1042] 2 locks held by getty/7757: [ 566.770243][ T1042] #0: 00000000a0d41e09 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.779207][ T1042] #1: 00000000b32cce11 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.788885][ T1042] 2 locks held by getty/7758: [ 566.793608][ T1042] #0: 00000000176ab824 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 566.802663][ T1042] #1: 00000000f9cd9bea (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 566.812309][ T1042] [ 566.814640][ T1042] ============================================= [ 566.814640][ T1042] [ 566.823153][ T1042] NMI backtrace for cpu 1 [ 566.827488][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 566.835011][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 566.845098][ T1042] Call Trace: [ 566.848447][ T1042] dump_stack+0x172/0x1f0 [ 566.852763][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 566.860132][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 566.865854][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 566.871865][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 566.877755][ T1042] watchdog+0x9b7/0xec0 [ 566.881962][ T1042] kthread+0x357/0x430 [ 566.886218][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 566.891747][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 566.897977][ T1042] ret_from_fork+0x3a/0x50 [ 566.902558][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 566.907881][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 566.908787][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 566.922983][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 566.930507][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 566.940551][ T1042] Call Trace: [ 566.943831][ T1042] dump_stack+0x172/0x1f0 [ 566.948152][ T1042] panic+0x2cb/0x65c [ 566.952032][ T1042] ? __warn_printk+0xf3/0xf3 [ 566.956618][ T1042] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 566.962387][ T1042] ? printk_safe_flush+0xf2/0x140 [ 566.967407][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 566.973643][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 566.979265][ T1042] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 566.985409][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 566.991602][ T1042] watchdog+0x9c8/0xec0 [ 566.995753][ T1042] kthread+0x357/0x430 [ 566.999806][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 567.005342][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 567.011577][ T1042] ret_from_fork+0x3a/0x50 [ 567.016900][ T1042] Kernel Offset: disabled [ 567.021229][ T1042] Rebooting in 86400 seconds..