[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.154' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   28.075323] INFO: trying to register non-static key.
[   28.080427] the code is fine but needs lockdep annotation.
[   28.086031] turning off the locking correctness validator.
[   28.091634] CPU: 0 PID: 7959 Comm: syz-executor993 Not tainted 4.14.281-syzkaller #0
[   28.099494] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   28.108824] Call Trace:
[   28.111394]  dump_stack+0x1b2/0x281
[   28.115002]  register_lock_class+0x389/0x1180
[   28.119476]  ? static_obj+0x50/0x50
[   28.123084]  ? save_trace+0xd6/0x290
[   28.126779]  __lock_acquire+0x167/0x3f20
[   28.130819]  ? cpuacct_charge+0x1ca/0x350
[   28.134943]  ? __lock_acquire+0x5fc/0x3f20
[   28.139150]  ? trace_hardirqs_on+0x10/0x10
[   28.143357]  ? __lock_acquire+0x5fc/0x3f20
[   28.147573]  ? trace_hardirqs_on+0x10/0x10
[   28.151790]  lock_acquire+0x170/0x3f0
[   28.155565]  ? flush_work+0x88/0x770
[   28.159251]  ? finish_task_switch+0x178/0x610
[   28.163722]  flush_work+0xad/0x770
[   28.167236]  ? flush_work+0x88/0x770
[   28.170922]  ? worker_thread+0xff0/0xff0
[   28.174955]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   28.179944]  ? _raw_spin_unlock_irq+0x5a/0x80
[   28.184431]  ? finish_task_switch+0x178/0x610
[   28.188897]  ? finish_task_switch+0x14d/0x610
[   28.193365]  ? mark_held_locks+0xa6/0xf0
[   28.197400]  ? __cancel_work_timer+0x2c1/0x460
[   28.201956]  __cancel_work_timer+0x321/0x460
[   28.206338]  ? work_on_cpu_safe+0x70/0x70
[   28.210460]  ? ___preempt_schedule+0x16/0x18
[   28.214841]  ? preempt_schedule_common+0x45/0xc0
[   28.219569]  ? ___preempt_schedule+0x16/0x18
[   28.223956]  ? smc_accept_dequeue+0x382/0x5c0
[   28.228425]  smc_close_active+0x7e2/0xbb0
[   28.232555]  smc_release+0x3e1/0x5d0
[   28.236242]  __sock_release+0xcd/0x2b0
[   28.240102]  ? __sock_release+0x2b0/0x2b0
[   28.244223]  sock_close+0x15/0x20
[   28.247649]  __fput+0x25f/0x7a0
[   28.250907]  task_work_run+0x11f/0x190
[   28.254769]  do_exit+0xa44/0x2850
[   28.258195]  ? ___preempt_schedule+0x16/0x18
[   28.262575]  ? mm_update_next_owner+0x5b0/0x5b0
[   28.267216]  ? smc_listen+0xe3/0x370
[   28.270905]  ? __local_bh_enable_ip+0x132/0x170
[   28.275547]  ? smc_listen+0xe3/0x370
[   28.279237]  ? SyS_listen+0x170/0x210
[   28.283013]  do_group_exit+0x100/0x2e0
[   28.286875]  SyS_exit_group+0x19/0x20
[   28.290649]  ? do_group_exit+0x2e0/0x2e0
[   28.294692]  do_syscall_64+0x1d5/0x640
[   28.298821]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   28.304006] RIP: 0033:0x7f680a93ab79
[   28.307696] RSP: 002b:00007ffd856c3338 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   28.315402] RAX: ffffffffffffffda RBX: 00007f680a9ae270 RCX: 00007f680a93ab79
[   28.322643] RDX: 000000000000003c RSI: 00