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-mmots-kasan-gce-4,10.128.15.204' (ECDSA) to the list of known hosts.
2017/10/19 04:10:28 parsed 1 programs
2017/10/19 04:10:28 executed programs: 0
syzkaller login: [   56.976475] ------------[ cut here ]------------
[   56.977302] WARNING: CPU: 1 PID: 2998 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230
[   56.978553] Kernel panic - not syncing: panic_on_warn set ...
[   56.978553] 
[   56.979546] CPU: 1 PID: 2998 Comm: syz-executor0 Not tainted 4.14.0-rc5-mm1+ #18
[   56.980603] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   56.981827] Call Trace:
[   56.982200]  dump_stack+0x194/0x257
[   56.982711]  ? arch_local_irq_restore+0x53/0x53
[   56.983340]  ? vsnprintf+0x1ed/0x1900
[   56.983860]  panic+0x1e4/0x41c
[   56.984297]  ? refcount_error_report+0x214/0x214
[   56.984931]  ? show_regs_print_info+0x65/0x65
[   56.985541]  ? __warn+0x1a9/0x1e0
[   56.986012]  ? task_participate_group_stop+0x1ce/0x230
[   56.986712]  __warn+0x1c4/0x1e0
[   56.987158]  ? task_participate_group_stop+0x1ce/0x230
[   56.987917]  report_bug+0x211/0x2d0
[   56.988439]  fixup_bug+0x40/0x90
[   56.988896]  do_trap+0x260/0x390
[   56.989357]  do_error_trap+0x120/0x390
[   56.989898]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   56.990578]  ? do_trap+0x390/0x390
[   56.991057]  ? task_participate_group_stop+0x1ce/0x230
[   56.991769]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   56.992419]  do_invalid_op+0x1b/0x20
[   56.992942]  invalid_op+0x18/0x20
[   56.993426] RIP: 0010:task_participate_group_stop+0x1ce/0x230
[   56.994203] RSP: 0018:ffff8801d27178b8 EFLAGS: 00010093
[   56.994915] RAX: ffff8801d1d6c040 RBX: ffff8801d1d6c040 RCX: ffffffff8143bf6e
[   56.995946] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d1d6c4c0
[   56.998854] RBP: ffff8801d27178d0 R08: ffffffff81441b7c R09: 000000000000000c
[   57.006089] R10: ffff8801d27177b0 R11: 0000000000000000 R12: ffff8801d1d6f980
[   57.013327] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d1d6c5b8
[   57.020572]  ? ptrace_stop+0x5bc/0xa40
[   57.024428]  ? task_participate_group_stop+0x1ce/0x230
[   57.029677]  ? task_participate_group_stop+0x1ce/0x230
[   57.034918]  ? do_signal_stop+0x486/0x910
[   57.039031]  do_signal_stop+0x217/0x910
[   57.042978]  ? ptrace_do_notify+0x310/0x310
[   57.047270]  ? __lock_is_held+0xb6/0x140
[   57.051313]  get_signal+0x55a/0x16d0
[   57.055002]  ? ptrace_notify+0x130/0x130
[   57.059032]  ? trace_hardirqs_on+0xd/0x10
[   57.063150]  ? hrtimer_try_to_cancel+0x9a/0x5c0
[   57.067789]  ? __hrtimer_get_remaining+0x1c0/0x1c0
[   57.072690]  ? trace_event_raw_event_sched_switch+0x8a0/0x8a0
[   57.078538]  ? check_noncircular+0x20/0x20
[   57.082744]  ? rcu_note_context_switch+0x710/0x710
[   57.087643]  do_signal+0x94/0x1ee0
[   57.091149]  ? __might_sleep+0x95/0x190
[   57.095094]  ? do_nanosleep+0x4f9/0x6e0
[   57.099039]  ? setup_sigcontext+0x7d0/0x7d0
[   57.103331]  ? schedule_timeout_idle+0x90/0x90
[   57.107893]  ? rcu_pm_notify+0xc0/0xc0
[   57.111761]  ? hrtimer_nanosleep+0x2cc/0x860
[   57.116136]  ? SyS_waitid+0x50/0x50
[   57.119732]  ? exit_to_usermode_loop+0x8c/0x310
[   57.124374]  exit_to_usermode_loop+0x214/0x310
[   57.128926]  ? trace_event_raw_event_sys_exit+0x260/0x260
[   57.134435]  ? __hrtimer_init+0x140/0x140
[   57.138555]  syscall_return_slowpath+0x42f/0x510
[   57.143280]  ? prepare_exit_to_usermode+0x2d0/0x2d0
[   57.148264]  ? entry_SYSCALL_64_fastpath+0x91/0xbe
[   57.153166]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   57.158152]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   57.162881]  entry_SYSCALL_64_fastpath+0xbc/0xbe
[   57.167603] RIP: 0033:0x47dd60
[   57.170759] RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
[   57.178432] RAX: fffffffffffffdfc RBX: 0000000000e3c914 RCX: 000000000047dd60
[   57.185668] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10
[   57.192904] RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000e3c940
[   57.200140] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   57.207375] R13: 0000000000000003 R14: 000000000000de7f R15: 0000000000000016