[ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.128' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 27.142287] [ 27.143934] ================================================ [ 27.149712] WARNING: lock held when returning to user space! [ 27.155488] 4.14.304-syzkaller #0 Not tainted [ 27.159951] ------------------------------------------------ [ 27.165714] syz-executor166/8002 is leaving the kernel with locks still held! [ 27.172959] 1 lock held by syz-executor166/8002: [ 27.177681] #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [] lo_ioctl+0x87/0x1cd0