[ 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 '10.128.0.136' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.196029][ T8367] [ 47.198529][ T8367] ==================================== [ 47.203968][ T8367] WARNING: iou-sqp-8366/8367 still has locks held! [ 47.210562][ T8367] 5.12.0-rc5-syzkaller #0 Not tainted [ 47.215931][ T8367] ------------------------------------ [ 47.221568][ T8367] 1 lock held by iou-sqp-8366/8367: [ 47.227054][ T8367] #0: ffff88801c9d8470 (&sqd->lock){+.+.}-{3:3}, at: io_sq_thread+0xfba/0x13b0 [ 47.236218][ T8367] [ 47.236218][ T8367] stack backtrace: [ 47.242448][ T8367] CPU: 0 PID: 8367 Comm: iou-sqp-8366 Not tainted 5.12.0-rc5-syzkaller #0 [ 47.250957][ T8367] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.260994][ T8367] Call Trace: [ 47.264255][ T8367] dump_stack+0x176/0x24e [ 47.268627][ T8367] get_signal+0x127/0x2030 [ 47.273024][ T8367] ? io_sq_thread+0x10bf/0x13b0 [ 47.277890][ T8367] ? rcu_read_lock_sched_held+0x41/0xb0 [ 47.283413][ T8367] ? _raw_spin_unlock_irqrestore+0x3f/0xc0 [ 47.289195][ T8367] ? lockdep_hardirqs_on+0x8d/0x130 [ 47.294370][ T8367] io