Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.217' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   29.494325] INFO: trying to register non-static key.
[   29.499486] the code is fine but needs lockdep annotation.
[   29.505083] turning off the locking correctness validator.
[   29.510695] CPU: 0 PID: 7989 Comm: syz-executor153 Not tainted 4.14.202-syzkaller #0
[   29.518569] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.528149] Call Trace:
[   29.530732]  dump_stack+0x1b2/0x283
[   29.534351]  register_lock_class+0x32b/0x1320
[   29.538827]  ? static_obj+0x50/0x50
[   29.542429]  ? save_trace+0xd6/0x290
[   29.546119]  __lock_acquire+0x167/0x3f20
[   29.550160]  ? cpuacct_charge+0x1ca/0x350
[   29.554297]  ? __lock_acquire+0x5fc/0x3f20
[   29.558613]  ? trace_hardirqs_on+0x10/0x10
[   29.562826]  ? __lock_acquire+0x5fc/0x3f20
[   29.567402]  ? trace_hardirqs_on+0x10/0x10
[   29.571630]  lock_acquire+0x170/0x3f0
[   29.575930]  ? flush_work+0x88/0x770
[   29.579801]  ? finish_task_switch+0x178/0x610
[   29.584290]  flush_work+0xad/0x770
[   29.587823]  ? flush_work+0x88/0x770
[   29.591537]  ? worker_thread+0xff0/0xff0
[   29.595574]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   29.600575]  ? _raw_spin_unlock_irq+0x5a/0x80
[   29.605051]  ? finish_task_switch+0x178/0x610
[   29.609539]  ? finish_task_switch+0x14d/0x610
[   29.614011]  ? mark_held_locks+0xa6/0xf0
[   29.618066]  ? __cancel_work_timer+0x2c1/0x460
[   29.622638]  __cancel_work_timer+0x321/0x460
[   29.627027]  ? work_on_cpu_safe+0x70/0x70
[   29.631158]  ? ___preempt_schedule+0x16/0x18
[   29.635546]  ? preempt_schedule_common+0x45/0xc0
[   29.640287]  ? ___preempt_schedule+0x16/0x18
[   29.644723]  ? smc_accept_dequeue+0x382/0x5c0
[   29.649240]  smc_close_active+0x768/0xb20
[   29.653402]  smc_release+0x3e1/0x5d0
[   29.657115]  __sock_release+0xcd/0x2b0
[   29.660981]  ? __sock_release+0x2b0/0x2b0
[   29.665106]  sock_close+0x15/0x20
[   29.668549]  __fput+0x25f/0x7a0
[   29.671860]  task_work_run+0x11f/0x190
[   29.675752]  do_exit+0xa08/0x27f0
[   29.679375]  ? ___preempt_schedule+0x16/0x18
[   29.683774]  ? mm_update_next_owner+0x5b0/0x5b0
[   29.688445]  ? smc_listen+0xe3/0x370
[   29.692247]  ? __local_bh_enable_ip+0x132/0x170
[   29.696927]  ? smc_listen+0xe3/0x370
[   29.700626]  ? SyS_listen+0x170/0x210
[   29.704437]  do_group_exit+0x100/0x2e0
[   29.708341]  SyS_exit_group+0x19/0x20
[   29.712142]  ? do_group_exit+0x2e0/0x2e0
[   29.716292]  do_syscall_64+0x1d5/0x640
[   29.720177]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   29.725378] RIP: 0033:0x43ee58
[   29.728549] RSP: 002b:00007ffc331c0e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   29.736259] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee58
[   29.743521] RDX: 000