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 'ci-android-49-kasan-gce-2,10.128.15.226' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 47.060370] ------------[ cut here ]------------ [ 47.061126] WARNING: CPU: 1 PID: 1 at kernel/signal.c:334 task_participate_group_stop+0x224/0x2d0 [ 47.062523] Kernel panic - not syncing: panic_on_warn set ... [ 47.062523] [ 47.063504] CPU: 1 PID: 1 Comm: init Not tainted 4.9.64-gfbb7468 #94 [ 47.064372] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.065589] ffff8801da20fae0 ffffffff81d90429 ffffffff83a46d00 ffff8801da20fbb8 [ 47.066715] ffffffff83a4d800 ffffffff8115a9c4 0000000000000009 ffff8801da20fba8 [ 47.067844] ffffffff8142c4e1 0000000041b58ab3 ffffffff84186a90 ffffffff8142c325 [ 47.068983] Call Trace: [ 47.069336] [] dump_stack+0xc1/0x128 [ 47.070044] [] ? task_participate_group_stop+0x224/0x2d0 [ 47.070992] [] panic+0x1bc/0x3a8 [ 47.071670] [] ? percpu_up_read_preempt_enable.constprop.54+0xd7/0xd7 [ 47.072743] [] ? load_image_and_restore+0xf9/0xf9 [ 47.073598] [] ? task_participate_group_stop+0x224/0x2d0 [ 47.074557] [] __warn+0x1c4/0x1e0 [ 47.075232] [] ? recalc_sigpending_tsk+0x102/0x150 [ 47.076106] [] warn_slowpath_null+0x2c/0x40 [ 47.077008] [] task_participate_group_stop+0x224/0x2d0 [ 47.077914] [] ? do_signal_stop+0x38a/0x7b0 [ 47.078699] [] do_signal_stop+0x19b/0x7b0 [ 47.079462] [] get_signal+0x430/0x14e0 [ 47.080192] [] do_signal+0x87/0x1a00 [ 47.083728] [] ? poll_select_copy_remaining+0x27d/0x3a0 [ 47.090702] [] ? poll_schedule_timeout+0x1f0/0x1f0 [ 47.097243] [] ? setup_sigcontext+0x7d0/0x7d0 [ 47.103351] [] ? kvm_clock_get_cycles+0x9/0x10 [ 47.109545] [] ? ktime_get_ts64+0x1ea/0x2c0 [ 47.115479] [] ? poll_select_set_timeout+0xa6/0x110 [ 47.122109] [] ? timespec64_add_safe+0x10c/0x170 [ 47.128474] [] ? SyS_select+0x176/0x1e0 [ 47.134059] [] ? core_sys_select+0x730/0x730 [ 47.140078] [] ? exit_to_usermode_loop+0xac/0x120 [ 47.146532] [] exit_to_usermode_loop+0xe1/0x120 [ 47.152814] [] syscall_return_slowpath+0x1a0/0x1e0 [ 47.159356] [] entry_SYSCALL_64_fastpath+0xc4/0xc6 [ 48.242054] Shutting down cpus with NMI [ 48.246575] Dumping ftrace buffer: [ 48.250176] (ftrace buffer empty) [ 48.253852] Kernel Offset: disabled [ 48.257454] Rebooting in 86400 seconds..