[  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 '10.128.0.147' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   31.627766] INFO: trying to register non-static key.
[   31.633004] the code is fine but needs lockdep annotation.
[   31.638597] turning off the locking correctness validator.
[   31.644198] CPU: 0 PID: 7969 Comm: syz-executor337 Not tainted 4.14.232-syzkaller #0
[   31.652047] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.661384] Call Trace:
[   31.663950]  dump_stack+0x1b2/0x281
[   31.667564]  register_lock_class+0x32b/0x1320
[   31.672032]  ? static_obj+0x50/0x50
[   31.675629]  ? save_trace+0xd6/0x290
[   31.679359]  __lock_acquire+0x167/0x3f20
[   31.683410]  ? cpuacct_charge+0x1ca/0x350
[   31.687530]  ? __lock_acquire+0x5fc/0x3f20
[   31.691738]  ? trace_hardirqs_on+0x10/0x10
[   31.695955]  ? __lock_acquire+0x5fc/0x3f20
[   31.700174]  ? trace_hardirqs_on+0x10/0x10
[   31.704384]  lock_acquire+0x170/0x3f0
[   31.708169]  ? flush_work+0x88/0x770
[   31.711868]  ? finish_task_switch+0x178/0x610
[   31.716334]  flush_work+0xad/0x770
[   31.719845]  ? flush_work+0x88/0x770
[   31.723529]  ? worker_thread+0xff0/0xff0
[   31.727573]  ? trace_hardirqs_on_caller+0x3a8/0x580
[   31.732575]  ? _raw_spin_unlock_irq+0x5a/0x80
[   31.737043]  ? finish_task_switch+0x178/0x610
[   31.741511]  ? finish_task_switch+0x14d/0x610
[   31.745985]  ? mark_held_locks+0xa6/0xf0
[   31.750020]  ? __cancel_work_timer+0x2c1/0x460
[   31.754573]  __cancel_work_timer+0x321/0x460
[   31.758966]  ? work_on_cpu_safe+0x70/0x70
[   31.763092]  ? ___preempt_schedule+0x16/0x18
[   31.767473]  ? preempt_schedule_common+0x45/0xc0
[   31.772200]  ? ___preempt_schedule+0x16/0x18
[   31.776579]  ? smc_accept_dequeue+0x382/0x5c0
[   31.781057]  smc_close_active+0x768/0xb20
[   31.785184]  smc_release+0x3e1/0x5d0
[   31.788884]  __sock_release+0xcd/0x2b0
[   31.792743]  ? __sock_release+0x2b0/0x2b0
[   31.796884]  sock_close+0x15/0x20
[   31.800309]  __fput+0x25f/0x7a0
[   31.803578]  task_work_run+0x11f/0x190
[   31.807447]  do_exit+0xa44/0x2850
[   31.810873]  ? __do_page_fault+0x571/0xad0
[   31.815080]  ? mm_update_next_owner+0x5b0/0x5b0
[   31.819723]  ? lock_downgrade+0x740/0x740
[   31.823856]  do_group_exit+0x100/0x2e0
[   31.827728]  SyS_exit_group+0x19/0x20
[   31.831502]  ? do_group_exit+0x2e0/0x2e0
[   31.835533]  do_syscall_64+0x1d5/0x640
[   31.839406]  entry_SYSCALL_64_after_hwframe+0x46/0xbb
[   31.844578] RIP: 0033:0x43da19
[   31.847740] RSP: 002b:00007ffef3685cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   31.855419] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043da19
[   31.862672] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
[   31.869914] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488
[   31.877166] R10: