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-upstream-kasan-gce-2,10.128.0.58' (ECDSA) to the list of known hosts. 2017/09/10 03:31:32 parsed 1 programs 2017/09/10 03:31:32 executed programs: 0 syzkaller login: [ 42.431235] ------------[ cut here ]------------ [ 42.436038] WARNING: CPU: 1 PID: 1 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230 [ 42.445030] Kernel panic - not syncing: panic_on_warn set ... [ 42.445030] [ 42.452365] CPU: 1 PID: 1 Comm: init Not tainted 4.13.0+ #76 [ 42.458133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.467461] Call Trace: [ 42.470028] dump_stack+0x194/0x257 [ 42.473631] ? arch_local_irq_restore+0x53/0x53 [ 42.478283] panic+0x1e4/0x417 [ 42.481446] ? __warn+0x1d9/0x1d9 [ 42.484870] ? show_regs_print_info+0x65/0x65 [ 42.489354] ? task_participate_group_stop+0x1ce/0x230 [ 42.494602] __warn+0x1c4/0x1d9 [ 42.497864] ? task_participate_group_stop+0x1ce/0x230 [ 42.503114] report_bug+0x211/0x2d0 [ 42.506719] fixup_bug+0x40/0x90 [ 42.510057] do_trap+0x260/0x390 [ 42.513405] do_error_trap+0x120/0x390 [ 42.517269] ? do_trap+0x390/0x390 [ 42.520783] ? task_participate_group_stop+0x1ce/0x230 [ 42.526042] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.530862] do_invalid_op+0x1b/0x20 [ 42.534550] invalid_op+0x18/0x20 [ 42.537972] RIP: 0010:task_participate_group_stop+0x1ce/0x230 [ 42.543824] RSP: 0018:ffff8801d9ee77f0 EFLAGS: 00010097 [ 42.549161] RAX: ffff8801d9ed8040 RBX: ffff8801d9ed8040 RCX: ffff8801d9edb2c0 [ 42.556409] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d9ed84d0 [ 42.563652] RBP: ffff8801d9ee7808 R08: ffff8801d9ee7180 R09: ffff8801d9ee7178 [ 42.570895] R10: ffff8801d9ee70f0 R11: 1ffff1003b3db29b R12: ffff8801d9ee9740 [ 42.578146] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d9ed85c8 [ 42.585414] ? do_signal_stop+0x486/0x900 [ 42.589535] do_signal_stop+0x217/0x900 [ 42.593496] ? ptrace_do_notify+0x310/0x310 [ 42.597793] ? __lock_is_held+0xbc/0x140 [ 42.601839] get_signal+0x61c/0x17e0 [ 42.605551] ? ptrace_notify+0x130/0x130 [ 42.609586] ? find_held_lock+0x39/0x1d0 [ 42.613631] ? lock_downgrade+0x990/0x990 [ 42.617765] do_signal+0x94/0x1ee0 [ 42.621289] ? lock_release+0xd70/0xd70 [ 42.625238] ? check_same_owner+0x320/0x320 [ 42.629534] ? ktime_get_ts64+0x328/0x4d0 [ 42.633658] ? setup_sigcontext+0x7d0/0x7d0 [ 42.637955] ? __might_sleep+0x95/0x190 [ 42.641910] ? kasan_check_read+0x11/0x20 [ 42.646029] ? _copy_to_user+0xa2/0xc0 [ 42.649895] ? poll_select_copy_remaining+0x3ef/0x6e0 [ 42.655058] ? poll_schedule_timeout+0x1f0/0x1f0 [ 42.659790] ? exit_to_usermode_loop+0x98/0x300 [ 42.664439] exit_to_usermode_loop+0x224/0x300 [ 42.668994] ? poll_select_set_timeout+0x12f/0x210 [ 42.673899] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 42.679412] ? kasan_check_write