[ 34.193855][ T26] audit: type=1800 audit(1554591590.583:27): pid=7466 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.223359][ T26] audit: type=1800 audit(1554591590.583:28): pid=7466 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. [ 34.991822][ T26] audit: type=1800 audit(1554591591.433:29): pid=7466 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 [ 35.011964][ T26] audit: type=1800 audit(1554591591.433:30): pid=7466 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 '10.128.10.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 501.998105][ T1042] INFO: task syz-executor270:7618 blocked for more than 143 seconds. [ 502.006602][ T1042] Not tainted 5.1.0-rc3+ #54 [ 502.011935][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 502.020692][ T1042] syz-executor270 D28216 7618 7616 0xa0020000 [ 502.027206][ T1042] Call Trace: [ 502.030820][ T1042] __schedule+0x817/0x1cc0 [ 502.035533][ T1042] ? __sched_text_start+0x8/0x8 [ 502.040568][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 502.045753][ T1042] schedule+0x92/0x180 [ 502.050151][ T1042] schedule_timeout+0x8ca/0xfd0 [ 502.055011][ T1042] ? wait_for_completion+0x294/0x440 [ 502.060414][ T1042] ? find_held_lock+0x35/0x130 [ 502.065193][ T1042] ? usleep_range+0x170/0x170 [ 502.070019][ T1042] ? kasan_check_write+0x14/0x20 [ 502.075000][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 502.080563][ T1042] ? wait_for_completion+0x294/0x440 [ 502.086408][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 502.091726][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 502.098365][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 502.103454][ T1042] ? kasan_check_read+0x11/0x20 [ 502.108510][ T1042] wait_for_completion+0x29c/0x440 [ 502.113628][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 502.119016][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 502.126022][ T1042] ? wake_up_q+0xf0/0xf0 [ 502.130406][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 502.136582][ T1042] exit_aio+0x321/0x3a0 [ 502.140906][ T1042] ? aio_poll_wake+0x11e0/0x11e0 [ 502.146498][ T1042] ? mutex_unlock+0xd/0x10 [ 502.151123][ T1042] mmput+0xcf/0x4c0 [ 502.154971][ T1042] do_exit+0x816/0x2fa0 [ 502.159278][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 502.165591][ T1042] ? kmem_cache_free.cold+0xd/0x23 [ 502.170816][ T1042] ? mm_update_next_owner+0x640/0x640 [ 502.176297][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 502.182668][ T1042] ? __ia32_compat_sys_io_submit+0x356/0x570 [ 502.189315][ T1042] ? __ia32_sys_io_submit+0x560/0x560 [ 502.194761][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 502.200547][ T1042] do_group_exit+0x135/0x370 [ 502.205298][ T1042] __ia32_sys_exit_group+0x44/0x50 [ 502.210678][ T1042] do_fast_syscall_32+0x281/0xc98 [ 502.215814][ T1042] entry_SYSENTER_compat+0x70/0x7f [ 502.221040][ T1042] RIP: 0023:0xf7fe0869 [ 502.225234][ T1042] Code: Bad RIP value. [ 502.229397][ T1042] RSP: 002b:00000000ffcc065c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 502.238003][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080eb2b8 [ 502.246063][ T1042] RDX: 0000000000000000 RSI: 00000000080d5f98 RDI: 00000000080eb2c0 [ 502.254895][ T1042] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 502.263596][ T1042] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 502.272938][ T1042] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 502.281108][ T1042] [ 502.281108][ T1042] Showing all locks held in the system: [ 502.288937][ T1042] 1 lock held by khungtaskd/1042: [ 502.293969][ T1042] #0: 0000000058dec5dc (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 502.303583][ T1042] 1 lock held by rsyslogd/7505: [ 502.308584][ T1042] #0: 000000002add1a99 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 502.317525][ T1042] 2 locks held by getty/7594: [ 502.322405][ T1042] #0: 000000001d83ef64 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.331528][ T1042] #1: 00000000112e0816 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.341287][ T1042] 2 locks held by getty/7595: [ 502.346043][ T1042] #0: 00000000bde2434a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.355200][ T1042] #1: 000000005ca6ca78 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.365196][ T1042] 2 locks held by getty/7596: [ 502.369942][ T1042] #0: 00000000bf599803 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.379078][ T1042] #1: 000000002eeb12e1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.389272][ T1042] 2 locks held by getty/7597: [ 502.393937][ T1042] #0: 00000000cc8d6290 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.403142][ T1042] #1: 000000007f22df55 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.412896][ T1042] 2 locks held by getty/7598: [ 502.417548][ T1042] #0: 00000000d5827ca6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.426584][ T1042] #1: 00000000e84b4420 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.436217][ T1042] 2 locks held by getty/7599: [ 502.441079][ T1042] #0: 0000000097deb03a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.450113][ T1042] #1: 00000000cbbb1740 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.459904][ T1042] 2 locks held by getty/7600: [ 502.464570][ T1042] #0: 000000007ae7e683 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.474614][ T1042] #1: 00000000f1b0704c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 502.484365][ T1042] [ 502.487346][ T1042] ============================================= [ 502.487346][ T1042] [ 502.495902][ T1042] NMI backtrace for cpu 1 [ 502.500328][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #54 [ 502.507885][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 502.518452][ T1042] Call Trace: [ 502.521817][ T1042] dump_stack+0x172/0x1f0 [ 502.526359][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 502.531701][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 502.537348][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 502.543577][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 502.549490][ T1042] watchdog+0x9b7/0xec0 [ 502.553920][ T1042] kthread+0x357/0x430 [ 502.558072][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 502.563632][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 502.569979][ T1042] ret_from_fork+0x3a/0x50 [ 502.574532][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 502.579933][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 502.580834][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 502.595559][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #54 [ 502.603368][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 502.613436][ T1042] Call Trace: [ 502.616744][ T1042] dump_stack+0x172/0x1f0 [ 502.621076][ T1042] panic+0x2cb/0x65c [ 502.624970][ T1042] ? __warn_printk+0xf3/0xf3 [ 502.629867][ T1042] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 502.635648][ T1042] ? printk_safe_flush+0xf2/0x140 [ 502.640675][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 502.647424][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 502.665610][ T1042] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 502.671861][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 502.678011][ T1042] watchdog+0x9c8/0xec0 [ 502.682173][ T1042] kthread+0x357/0x430 [ 502.686237][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 502.692018][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 502.698328][ T1042] ret_from_fork+0x3a/0x50 [ 502.704225][ T1042] Kernel Offset: disabled [ 502.708704][ T1042] Rebooting in 86400 seconds..