[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.175' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   29.073672] INFO: trying to register non-static key.
[   29.078920] the code is fine but needs lockdep annotation.
[   29.084516] turning off the locking correctness validator.
[   29.090161] CPU: 1 PID: 7999 Comm: syz-executor667 Not tainted 4.14.204-syzkaller #0
[   29.098067] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.107470] Call Trace:
[   29.110036]  dump_stack+0x1b2/0x283
[   29.113639]  register_lock_class+0x32b/0x1320
[   29.118157]  ? static_obj+0x50/0x50
[   29.121756]  ? save_trace+0xd6/0x290
[   29.125458]  __lock_acquire+0x167/0x3f20
[   29.129504]  ? cpuacct_charge+0x1ca/0x350
[   29.133704]  ? __lock_acquire+0x5fc/0x3f20
[   29.137918]  ? trace_hardirqs_on+0x10/0x10
[   29.142122]  ? __lock_acquire+0x5fc/0x3f20
[   29.146347]  ? trace_hardirqs_on+0x10/0x10
[   29.150567]  lock_acquire+0x170/0x3f0
[   29.154357]  ? flush_work+0x88/0x770
[   29.158046]  ? finish_task_switch+0x178/0x610
[   29.162524]  flush_work+0xad/0x770
[   29.166050]  ? flush_work+0x88/0x770
[   29.169759]  ? worker_thread+0xff0/0xff0
[   29.173793]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   29.178783]  ? _raw_spin_unlock_irq+0x5a/0x80
[   29.183285]  ? finish_task_switch+0x178/0x610
[   29.187755]  ? finish_task_switch+0x14d/0x610
[   29.192414]  ? mark_held_locks+0xa6/0xf0
[   29.196483]  ? __cancel_work_timer+0x2c1/0x460
[   29.201082]  __cancel_work_timer+0x321/0x460
[   29.205497]  ? work_on_cpu_safe+0x70/0x70
[   29.209618]  ? ___preempt_schedule+0x16/0x18
[   29.214011]  ? preempt_schedule_common+0x45/0xc0
[   29.218744]  ? ___preempt_schedule+0x16/0x18
[   29.223386]  ? smc_accept_dequeue+0x382/0x5c0
[   29.227857]  smc_close_active+0x768/0xb20
[   29.231981]  smc_release+0x3e1/0x5d0
[   29.235671]  __sock_release+0xcd/0x2b0
[   29.239531]  ? __sock_release+0x2b0/0x2b0
[   29.243648]  sock_close+0x15/0x20
[   29.247085]  __fput+0x25f/0x7a0
[   29.250352]  task_work_run+0x11f/0x190
[   29.254227]  do_exit+0xa08/0x27f0
[   29.257669]  ? ___preempt_schedule+0x16/0x18
[   29.262067]  ? mm_update_next_owner+0x5b0/0x5b0
[   29.266724]  ? smc_listen+0xe3/0x370
[   29.270423]  ? __local_bh_enable_ip+0x132/0x1