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-386-2,10.128.0.10' (ECDSA) to the list of known hosts.
2017/10/19 04:10:25 parsed 1 programs
2017/10/19 04:10:25 executed programs: 0
syzkaller login: [   58.550309] ------------[ cut here ]------------
[   58.551102] WARNING: CPU: 0 PID: 2984 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230
[   58.552335] Kernel panic - not syncing: panic_on_warn set ...
[   58.552335] 
[   58.553302] CPU: 0 PID: 2984 Comm: syz-executor0 Not tainted 4.14.0-rc5+ #47
[   58.554248] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.555485] Call Trace:
[   58.555844]  dump_stack+0x194/0x257
[   58.556338]  ? arch_local_irq_restore+0x53/0x53
[   58.556971]  panic+0x1e4/0x417
[   58.557415]  ? __warn+0x1d9/0x1d9
[   58.557926]  ? show_regs_print_info+0x65/0x65
[   58.558563]  ? task_participate_group_stop+0x1ce/0x230
[   58.559263]  __warn+0x1c4/0x1d9
[   58.559708]  ? task_participate_group_stop+0x1ce/0x230
[   58.560422]  report_bug+0x211/0x2d0
[   58.560920]  fixup_bug+0x40/0x90
[   58.561376]  do_trap+0x260/0x390
[   58.561839]  do_error_trap+0x120/0x390
[   58.562363]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   58.563071]  ? do_trap+0x390/0x390
[   58.563585]  ? task_participate_group_stop+0x1ce/0x230
[   58.564296]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.564946]  do_invalid_op+0x1b/0x20
[   58.565469]  invalid_op+0x18/0x20
[   58.565936] RIP: 0010:task_participate_group_stop+0x1ce/0x230
[   58.566710] RSP: 0018:ffff8801d29ef808 EFLAGS: 00010097
[   58.567475] RAX: ffff8801d28fa2c0 RBX: ffff8801d28fa2c0 RCX: 0000000000000012
[   58.568439] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d28fa750
[   58.569419] RBP: ffff8801d29ef820 R08: ffffffff8143968c R09: 000000000000000c
[   58.570372] R10: ffff8801d29ef700 R11: 0000000000000000 R12: ffff8801d234f2c0
[   58.577022] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d28fa848
[   58.584271]  ? ptrace_stop+0x5bc/0xa40
[   58.588133]  ? task_participate_group_stop+0x1ce/0x230
[   58.593375]  ? do_signal_stop+0x486/0x910
[   58.597491]  do_signal_stop+0x217/0x910
[   58.601439]  ? ptrace_do_notify+0x310/0x310
[   58.605729]  ? __lock_is_held+0xb6/0x140
[   58.609768]  get_signal+0x55a/0x16d0
[   58.613457]  ? ptrace_notify+0x130/0x130
[   58.617492]  ? wait_consider_task+0x33c0/0x33c0
[   58.622132]  ? __might_sleep+0x95/0x190
[   58.626077]  ? do_nanosleep+0x4f9/0x6e0
[   58.630021]  ? schedule_timeout_idle+0x90/0x90
[   58.634575]  do_signal+0x94/0x1ee0
[   58.638086]  ? rcu_pm_notify+0xc0/0xc0
[   58.641946]  ? memset+0x31/0x40
[   58.645196]  ? setup_sigcontext+0x7d0/0x7d0
[   58.649488]  ? hrtimer_nanosleep+0x2cc/0x860
[   58.653867]  ? nanosleep_copyout+0x100/0x100
[   58.658242]  ? __might_sleep+0x95/0x190
[   58.662191]  ? kasan_check_write+0x14/0x20
[   58.666392]  ? _copy_from_user+0x99/0x110
[   58.670513]  ? __hrtimer_init+0x140/0x140
[   58.674630]  ? exit_to_usermode_loop+0x8c/0x310
[   58.679275]  exit_to_usermode_loop+0x214/0x310
[   58.683826]  ? trace_event_raw_event_sys_exit+0x260/0x260
[   58.689332]  ? do_fast_syscall_32+0x158/0xf05
[   58.693800]  do_fast_syscall_32+0x83e/0xf05
[   58.698095]  ? do_int80_syscall_32+0x940/0x940
[   58.702646]  ? trace_event_raw_event_sys_exit+0x260/0x260
[   58.708151]  ? syscall_return_slowpath+0x2b3/0x510
[   58.713045]  ? finish_task_switch+0x1aa/0x740
[   58.717510]  ? sysret32_from_system_call+0x5/0x3b
[   58.722325]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.727139]  entry_SYSENTER_compat+0x51/0x60
[   58.731514] RIP: 0023:0xf7fc2c79
[   58.734844] RSP: 002b:000000000847f9ec EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
[   58.742517] RAX: fffffffffffffdfc RBX: 000000000847fa18 RCX: 0000000000000000
[   58.749753] RDX: 0000000000000002 RSI: 000000000000e4a7 RDI: 0000000000000000
[   58.756993] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   58.764228] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   58.771463] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000