[ OK ] Started Getty on tty1. [ OK ] Found device /dev/ttyS0. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.862797][ T8360] [ 47.865170][ T8360] ==================================== [ 47.870607][ T8360] WARNING: iou-sqp-8359/8360 still has locks held! [ 47.877225][ T8360] 5.12.0-rc5-syzkaller #0 Not tainted [ 47.882662][ T8360] ------------------------------------ [ 47.888128][ T8360] 1 lock held by iou-sqp-8359/8360: [ 47.893403][ T8360] #0: ffff888017399070 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread+0xfba/0x13b0 [ 47.902509][ T8360] [ 47.902509][ T8360] stack backtrace: [ 47.908391][ T8360] CPU: 0 PID: 8360 Comm: iou-sqp-8359 Not tainted 5.12.0-rc5-syzkaller #0 [ 47.916891][ T8360] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.926924][ T8360] Call Trace: [ 47.930202][ T8360] dump_stack+0x176/0x24e [ 47.934524][ T8360] get_signal+0x127/0x2030 [ 47.938926][ T8360] ? io_sq_thread+0x10bf/0x13b0 [ 47.943770][ T8360] ? rcu_read_lock_sched_held+0x41/0xb0 [ 47.949298][ T8360] ? _raw_spin_unlock_irqrestore+0x3f/0xc0 [ 47.955102][ T8360] ? lockdep_hardirqs_on+0x8d/0x130 [ 47.960278][ T8360] io_sq_threa