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 '10.128.0.42' (ECDSA) to the list of known hosts. syzkaller login: [ 36.701481] [ 36.703119] ================================================ [ 36.708889] WARNING: lock held when returning to user space! [ 36.714657] 4.16.0+ #3 Not tainted [ 36.718182] ------------------------------------------------ [ 36.723951] syzkaller252875/4380 is leaving the kernel with locks still held! [ 36.731196] 1 lock held by syzkaller252875/4380: [ 36.735921] #0: 000000001e13611b (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x1ec0