INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. syzkaller login: [ 29.258188] [ 29.259834] ================================================ [ 29.265602] WARNING: lock held when returning to user space! [ 29.271369] 4.16.0+ #3 Not tainted [ 29.274880] ------------------------------------------------ [ 29.280649] syzkaller433111/4462 is leaving the kernel with locks still held! [ 29.287892] 1 lock held by syzkaller433111/4462: [ 29.292616] #0: 0000000003a06fae (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x1ec0