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-next-kasan-gce-4,10.128.0.15' (ECDSA) to the list of known hosts.
2017/11/14 03:43:46 parsed 1 programs
2017/11/14 03:43:46 executed programs: 0
syzkaller login: [   52.376117] WARNING: CPU: 1 PID: 3056 at kernel/signal.c:340 task_participate_group_stop+0x1ce/0x230
[   52.377483] Kernel panic - not syncing: panic_on_warn set ...
[   52.377483] 
[   52.378470] CPU: 1 PID: 3056 Comm: syz-executor0 Not tainted 4.14.0-next-20171113+ #41
[   52.379525] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   52.380745] Call Trace:
[   52.381106]  dump_stack+0x194/0x257
[   52.381617]  ? arch_local_irq_restore+0x53/0x53
[   52.382248]  ? vsnprintf+0x1ed/0x1900
[   52.382764]  panic+0x1e4/0x41c
[   52.383198]  ? refcount_error_report+0x214/0x214
[   52.383863]  ? show_regs_print_info+0x65/0x65
[   52.384471]  ? __warn+0x1c1/0x200
[   52.384941]  ? task_participate_group_stop+0x1ce/0x230
[   52.385639]  __warn+0x1dc/0x200
[   52.386083]  ? task_participate_group_stop+0x1ce/0x230
[   52.386788]  report_bug+0x211/0x2d0
[   52.387284]  fixup_bug.part.11+0x37/0x80
[   52.387831]  do_error_trap+0x2d7/0x3e0
[   52.388354]  ? _raw_spin_unlock_irqrestore+0x31/0xba
[   52.389034]  ? math_error+0x400/0x400
[   52.389544]  ? find_held_lock+0x39/0x1d0
[   52.390119]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   52.390768]  do_invalid_op+0x1b/0x20
[   52.391269]  invalid_op+0x18/0x20
[   52.391736] RIP: 0010:task_participate_group_stop+0x1ce/0x230
[   52.392512] RSP: 0018:ffff8801cd1378c8 EFLAGS: 00010093
[   52.393224] RAX: ffff8801cd95c140 RBX: ffff8801cd95c140 RCX: ffffffff8144366e
[   52.394196] RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801cd95c5c0
[   52.395149] RBP: ffff8801cd1378e0 R08: 1ffffffff0d26f73 R09: 000000000000000c
[   52.396103] R10: 0000000000000000 R11: ffffffff87469d60 R12: ffff8801cd1bec00
[   52.402383] R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801cd95c6b8
[   52.409640]  ? task_participate_group_stop+0x1ce/0x230
[   52.414890]  ? task_participate_group_stop+0x1ce/0x230
[   52.420132]  ? do_signal_stop+0x489/0x910
[   52.424245]  do_signal_stop+0x217/0x910
[   52.428192]  ? ptrace_do_notify+0x310/0x310
[   52.432482]  ? __lock_is_held+0xbc/0x140
[   52.436520]  get_signal+0x55a/0x16c0
[   52.440209]  ? ptrace_notify+0x130/0x130
[   52.444238]  ? trace_hardirqs_on+0xd/0x10
[   52.448357]  ? hrtimer_try_to_cancel+0x9a/0x5c0
[   52.452993]  ? __hrtimer_get_remaining+0x1c0/0x1c0
[   52.457892]  ? trace_event_raw_event_sched_switch+0x8a0/0x8a0
[   52.463749]  ? rcu_note_context_switch+0x710/0x710
[   52.468652]  do_signal+0x94/0x1ee0
[   52.472165]  ? do_nanosleep+0x4fc/0x6e0
[   52.476111]  ? setup_sigcontext+0x7d0/0x7d0
[   52.480409]  ? rcu_pm_notify+0xc0/0xc0
[   52.484281]  ? memset+0x31/0x40
[   52.487536]  ? hrtimer_nanosleep+0x2cc/0x860
[   52.491909]  ? SyS_waitid+0x50/0x50
[   52.495505]  ? exit_to_usermode_loop+0x8c/0x310
[   52.500145]  exit_to_usermode_loop+0x214/0x310
[   52.504694]  ? kasan_check_write+0x14/0x20
[   52.508899]  ? trace_event_raw_event_sys_exit+0x260/0x260
[   52.514404]  ? __hrtimer_init+0x140/0x140
[   52.518522]  syscall_return_slowpath+0x490/0x550
[   52.523243]  ? prepare_exit_to_usermode+0x340/0x340
[   52.528228]  ? entry_SYSCALL_64_fastpath+0x69/0x96
[   52.533126]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   52.538109]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   52.542836]  entry_SYSCALL_64_fastpath+0x94/0x96
[   52.547557] RIP: 0033:0x47dec0
[   52.550715] RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023
[   52.558388] RAX: fffffffffffffdfc RBX: 000000000275c914 RCX: 000000000047dec0
[   52.565624] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10
[   52.572858] RBP: 0000000000000002 R08: 0000000000000001 R09: 000000000275c940
[   52.580093] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   52.587330] R13: 0000000000000007 R14: 000000000000cc7e R15: 0000000000000016