[ 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 '10.128.0.76' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.493540] INFO: trying to register non-static key. [ 34.498654] the code is fine but needs lockdep annotation. [ 34.504249] turning off the locking correctness validator. [ 34.509849] CPU: 1 PID: 7997 Comm: syz-executor785 Not tainted 4.14.231-syzkaller #0 [ 34.517700] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.527047] Call Trace: [ 34.529654] dump_stack+0x1b2/0x281 [ 34.533263] register_lock_class+0x32b/0x1320 [ 34.537732] ? static_obj+0x50/0x50 [ 34.541348] ? save_trace+0xd6/0x290 [ 34.545036] __lock_acquire+0x167/0x3f20 [ 34.549069] ? cpuacct_charge+0x1ca/0x350 [ 34.553192] ? __lock_acquire+0x5fc/0x3f20 [ 34.557400] ? trace_hardirqs_on+0x10/0x10 [ 34.561695] ? __lock_acquire+0x5fc/0x3f20 [ 34.565914] ? trace_hardirqs_on+0x10/0x10 [ 34.570122] lock_acquire+0x170/0x3f0 [ 34.573899] ? flush_work+0x88/0x770 [ 34.577601] ? finish_task_switch+0x178/0x610 [ 34.582087] flush_work+0xad/0x770 [ 34.585614] ? flush_work+0x88/0x770 [ 34.589301] ? worker_thread+0xff0/0xff0 [ 34.593337] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 34.598331] ? _raw_spin_unlock_irq+0x5a/0x80 [ 34.602815] ? finish_task_switch+0x178/0x610 [ 34.607299] ? finish_task_switch+0x14d/0x610 [ 34.611770] ? mark_held_locks+0xa6/0xf0 [ 34.615823] ? __cancel_work_timer+0x2c1/0x460 [ 34.620398] __cancel_work_timer+0x321/0x460 [ 34.624797] ? work_on_cpu_safe+0x70/0x70 [ 34.628939] ? ___preempt_schedule+0x16/0x18 [ 34.633332] ? preempt_schedule_common+0x45/0xc0 [ 34.638071] ? ___preempt_schedule+0x16/0x18 [ 34.642470] ? smc_accept_dequeue+0x382/0x5c0 [ 34.646941] smc_close_active+0x768/0xb20 [ 34.651083] smc_release+0x3e1/0x5d0 [ 34.654862] __sock_release+0xcd/0x2b0 [ 34.658722] ? __sock_release+0x2b0/0x2b0 [ 34.662867] sock_close+0x15/0x20 [ 34.666296] __fput+0x25f/0x7a0 [ 34.669554] task_work_run+0x11f/0x190 [ 34.673595] do_exit+0xa44/0x2850 [ 34.677058] ? __do_page_fault+0x571/0xad0 [ 34.681278] ? mm_update_next_owner+0x5b0/0x5b0 [ 34.685924] ? lock_downgrade+0x740/0x740 [ 34.690125] do_group_exit+0x100/0x2e0 [ 34.694001] SyS_exit_group+0x19/0x20 [ 34.697785] ? do_group_exit+0x2e0/0x2e0 [ 34.701824] do_syscall_64+0x1d5/0x640 [ 34.705684] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 34.710855] RIP: 0033:0x43d9e9 [ 34.714069] RSP: 002b:00007fffc501b608 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.721792] RAX: ffffffffffffffda RBX: 00000000004ae230 RCX: 000000000043d9e9 [ 34.729045] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 34.736294] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000400488 [ 34.74354