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-1,10.128.0.19' (ECDSA) to the list of known hosts.
2017/10/19 04:10:33 parsed 1 programs
2017/10/19 04:10:33 executed programs: 0
syzkaller login: [   58.455394] ------------[ cut here ]------------
[   58.456247] WARNING: CPU: 1 PID: 2985 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230
[   58.457515] Kernel panic - not syncing: panic_on_warn set ...
[   58.457515] 
[   58.458529] CPU: 1 PID: 2985 Comm: syz-executor0 Not tainted 4.14.0-rc5+ #137
[   58.459502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.460739] Call Trace:
[   58.461128]  dump_stack+0x194/0x257
[   58.461652]  ? arch_local_irq_restore+0x53/0x53
[   58.462330]  panic+0x1e4/0x417
[   58.462789]  ? __warn+0x1d9/0x1d9
[   58.463286]  ? show_regs_print_info+0x65/0x65
[   58.463945]  ? task_participate_group_stop+0x1ce/0x230
[   58.464717]  __warn+0x1c4/0x1d9
[   58.465172]  ? task_participate_group_stop+0x1ce/0x230
[   58.465885]  report_bug+0x211/0x2d0
[   58.466410]  fixup_bug+0x40/0x90
[   58.466877]  do_trap+0x260/0x390
[   58.467348]  do_error_trap+0x120/0x390
[   58.467881]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   58.468636]  ? do_trap+0x390/0x390
[   58.469160]  ? task_participate_group_stop+0x1ce/0x230
[   58.469897]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.470686]  do_invalid_op+0x1b/0x20
[   58.471223]  invalid_op+0x18/0x20
[   58.471694] RIP: 0010:task_participate_group_stop+0x1ce/0x230
[   58.472477] RSP: 0018:ffff8801d1d8f8b8 EFLAGS: 00010097
[   58.473201] RAX: ffff8801d1d7c600 RBX: ffff8801d1d7c600 RCX: 0000000000000012
[   58.474177] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d1d7ca90
[   58.475202] RBP: ffff8801d1d8f8d0 R08: ffffffff8143968c R09: 000000000000000c
[   58.476155] R10: ffff8801d1d8f7b0 R11: 0000000000000000 R12: ffff8801d1cf5300
[   58.483401] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d1d7cb88
[   58.490652]  ? ptrace_stop+0x5bc/0xa40
[   58.494519]  ? task_participate_group_stop+0x1ce/0x230
[   58.499767]  ? do_signal_stop+0x486/0x910
[   58.503891]  do_signal_stop+0x217/0x910
[   58.507844]  ? ptrace_do_notify+0x310/0x310
[   58.512139]  ? __lock_is_held+0xb6/0x140
[   58.516199]  get_signal+0x55a/0x16d0
[   58.519907]  ? ptrace_notify+0x130/0x130
[   58.523964]  ? hrtimer_try_to_cancel+0x9a/0x5c0
[   58.528612]  ? __hrtimer_get_remaining+0x1c0/0x1c0
[   58.533518]  ? check_same_owner+0x320/0x320
[   58.537819]  ? check_noncircular+0x20/0x20
[   58.542039]  ? do_wait+0x4f0/0xa70
[   58.545565]  do_signal+0x94/0x1ee0
[   58.549080]  ? __might_sleep+0x95/0x190
[   58.553048]  ? do_nanosleep+0x4f9/0x6e0
[   58.557015]  ? setup_sigcontext+0x7d0/0x7d0
[   58.561314]  ? schedule_timeout_idle+0x90/0x90
[   58.565889]  ? rcu_pm_notify+0xc0/0xc0
[   58.569782]  ? hrtimer_nanosleep+0x2cc/0x860
[   58.574165]  ? SyS_waitid+0x50/0x50
[   58.577768]  ? exit_to_usermode_loop+0x8c/0x310
[   58.582421]  exit_to_usermode_loop+0x214/0x310
[   58.586984]  ? trace_event_raw_event_sys_exit+0x260/0x260
[   58.592501]  ? __hrtimer_init+0x140/0x140
[   58.596623]  syscall_return_slowpath+0x42f/0x510
[   58.601350]  ? prepare_exit_to_usermode+0x2d0/0x2d0
[   58.606337]  ? entry_SYSCALL_64_fastpath+0x91/0xbe
[   58.611246]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   58.616240]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   58.620983]  entry_SYSCALL_64_fastpath+0xbc/0xbe
[   58.625721] RIP: 0033:0x47dd60
[   58.628890] RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
[   58.636574] RAX: 0000000000000000 RBX: 00000000010cb914 RCX: 000000000047dd60
[   58.643819] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10
[   58.651063] RBP: 0000000000000002 R08: 0000000000000001 R09: 00000000010cb940
[   58.658307] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   58.665551] R13: 0000000000000002 R14: 000000000000e447 R15: 0000000000000016