[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ 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 '10.128.15.193' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 62.710063][ T7099] INFO: trying to register non-static key. [ 62.715865][ T7099] the code is fine but needs lockdep annotation. [ 62.722169][ T7099] turning off the locking correctness validator. [ 62.728600][ T7099] CPU: 1 PID: 7099 Comm: syz-executor897 Not tainted 5.6.0-next-20200406-syzkaller #0 [ 62.738122][ T7099] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.748160][ T7099] Call Trace: [ 62.751433][ T7099] dump_stack+0x188/0x20d [ 62.755776][ T7099] register_lock_class+0x1664/0x1760 [ 62.761040][ T7099] ? check_usage_forwards+0x482/0x4e0 [ 62.766388][ T7099] ? is_dynamic_key+0x1a0/0x1a0 [ 62.771215][ T7099] ? save_stack+0x32/0x40 [ 62.775528][ T7099] __lock_acquire+0x104/0x4e00 [ 62.781143][ T7099] ? __debug_object_init+0x4ae/0xe20 [ 62.786403][ T7099] ? print_usage_bug+0x240/0x240 [ 62.791321][ T7099] ? mark_lock+0x12b/0xf10 [ 62.795749][ T7099] ? lock_downgrade+0x840/0x840 [ 62.800581][ T7099] ? mark_held_locks+0xe0/0xe0 [ 62.805316][ T7099] ? mark_held_locks+0x9f/0xe0 [ 62.810054][ T7099] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 62.815843][ T7099] ? lockdep_hardirqs_on+0x463/0x620 [ 62.821100][ T7099] lock_acquire+0x1f2/0x8f0 [ 62.825616][ T7099] ? __io_uring_register+0x1fe8/0x2f00 [ 62.831047][ T7099] ? lock_release+0x800/0x800 [ 62.835724][ T7099] ? free_object+0x70/0x70 [ 62.840110][ T7099] _raw_spin_lock_irqsave+0x8c/0xbf [ 62.845276][ T7099] ? __io_uring_register+0x1fe8/0x2f00 [ 62.850737][ T7099] __io_uring_register+0x1fe8/0x2f00 [ 62.855994][ T7099] ? mutex_trylock+0x2c0/0x2c0 [ 62.860726][ T7099] ? io_uring_setup+0x11a6/0x22b0 [ 62.865722][ T7099] ? io_cqring_wait+0x950/0x950 [ 62.870545][ T7099] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 62.876094][ T7099] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 62.882059][ T7099] __x64_sys_io_uring_register+0x192/0x560 [ 62.887837][ T7099] ? do_syscall_64+0x21/0x7d0 [ 62.892498][ T7099] do_syscall_64+0xf6/0x7d0 [ 62.896973][ T7099] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 62.902834][ T7099] RIP: 0033:0x440289 [ 62.906716][ T7099] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 62.926289][ T7099] RSP: 002b:00007ffff1bbf558 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 62.934681][ T7099] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440289 [ 62.942646][ T7099] RDX: 0000000020000280 RSI: 0000000000000002 RDI: 0000000000000003 [ 62.950632][ T7099] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 62.958608][ T7099] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000401b10 [ 62.966552][ T7099] R13: 0000000000401ba0 R14: 0000000000000000 R15: 0000000000000000