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-0,10.128.15.220' (ECDSA) to the list of known hosts.
2017/11/02 12:27:05 parsed 1 programs
2017/11/02 12:27:05 executed programs: 0
syzkaller login: [   49.219612] ------------[ cut here ]------------
[   49.220402] WARNING: CPU: 1 PID: 16 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0
[   49.221669] Kernel panic - not syncing: panic_on_warn set ...
[   49.221669] 
[   49.222638] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.14.0-rc5-mm1+ #20
[   49.223584] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.224802] Call Trace:
[   49.225159]  dump_stack+0x194/0x257
[   49.225655]  ? arch_local_irq_restore+0x53/0x53
[   49.226282]  ? vsnprintf+0x1ed/0x1900
[   49.226809]  panic+0x1e4/0x41c
[   49.227244]  ? refcount_error_report+0x214/0x214
[   49.227896]  ? show_regs_print_info+0x65/0x65
[   49.228503]  ? __warn+0x1a9/0x1e0
[   49.228971]  ? free_kthread_struct+0xa2/0xe0
[   49.229558]  __warn+0x1c4/0x1e0
[   49.230005]  ? free_kthread_struct+0xa2/0xe0
[   49.230596]  report_bug+0x211/0x2d0
[   49.231089]  fixup_bug+0x40/0x90
[   49.231543]  do_trap+0x260/0x390
[   49.232004]  do_error_trap+0x120/0x390
[   49.232528]  ? do_trap+0x390/0x390
[   49.233004]  ? rcu_process_callbacks+0xd74/0x17d0
[   49.233651]  ? free_kthread_struct+0xa2/0xe0
[   49.234238]  ? kthread+0x38b/0x470
[   49.234713]  ? ret_from_fork+0x2a/0x40
[   49.235234]  ? __lock_is_held+0xb6/0x140
[   49.235784]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   49.236433]  do_invalid_op+0x1b/0x20
[   49.236931]  invalid_op+0x18/0x20
[   49.237394] RIP: 0010:free_kthread_struct+0xa2/0xe0
[   49.238083] RSP: 0018:ffff8801d9f9f730 EFLAGS: 00010206
[   49.239182] RAX: ffff8801d9f90440 RBX: ffff8801c8e0be00 RCX: ffffffff8148d7e2
[   49.240136] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c8e0beb8
[   49.247368] RBP: ffff8801d9f9f738 R08: 0000000000000001 R09: 1ffff1003b3f3ed5
[   49.254601] R10: ffff8801d9f9f670 R11: 0000000000000001 R12: 1ffff1003b3f3ee9
[   49.261835] R13: 1ffff1003b3f3eed R14: 0000000000000000 R15: ffff8801d9f9f7a8
[   49.269084]  ? free_kthread_struct+0xa2/0xe0
[   49.273465]  free_task+0x134/0x1a0
[   49.276971]  ? arch_release_task_struct+0x10/0x10
[   49.281782]  ? atomic_notifier_call_chain+0xb9/0x140
[   49.286853]  __put_task_struct+0x229/0x3b0
[   49.291052]  ? free_task+0x1a0/0x1a0
[   49.294744]  delayed_put_task_struct+0xca/0x3d0
[   49.299378]  ? child_wait_callback+0x210/0x210
[   49.303923]  ? put_pid+0x183/0x1f0
[   49.307429]  ? task_active_pid_ns+0xd0/0xd0
[   49.311723]  ? rcu_process_callbacks+0x115c/0x17d0
[   49.316618]  ? put_pid+0x1f0/0x1f0
[   49.320124]  ? child_wait_callback+0x210/0x210
[   49.324677]  rcu_process_callbacks+0xd74/0x17d0
[   49.329320]  ? note_gp_changes+0x650/0x650
[   49.333523]  ? _raw_spin_unlock_irq+0x27/0x70
[   49.337985]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   49.342967]  ? trace_hardirqs_on+0xd/0x10
[   49.347082]  ? mmdrop+0x18/0x30
[   49.350326]  ? finish_task_switch+0x1f6/0x740
[   49.354791]  ? preempt_notifier_dec+0x20/0x20
[   49.359266]  ? __schedule+0x8f3/0x2060
[   49.363129]  ? rcu_pm_notify+0xc0/0xc0
[   49.366996]  __do_softirq+0x2d7/0xb85
[   49.370760]  ? __sched_text_start+0x8/0x8
[   49.374884]  ? __irqentry_text_end+0x4/0x4
[   49.379090]  ? schedule+0xf5/0x430
[   49.382613]  ? rcu_note_context_switch+0x710/0x710
[   49.387510]  ? schedule+0xf5/0x430
[   49.391016]  ? run_ksoftirqd+0x55/0x100
[   49.394957]  ? takeover_tasklets+0xa40/0xa40
[   49.399332]  run_ksoftirqd+0x50/0x100
[   49.403098]  smpboot_thread_fn+0x450/0x7c0
[   49.407299]  ? sort_range+0x30/0x30
[   49.410893]  ? __kthread_parkme+0xcf/0x240
[   49.415094]  ? __kthread_parkme+0x175/0x240
[   49.419386]  kthread+0x38b/0x470
[   49.422716]  ? sort_range+0x30/0x30
[   49.426305]  ? kthread_create_on_node+0x100/0x100
[   49.431116]  ret_from_fork+0x2a/0x40
[   49.435214] Dumping ftrace buffer:
[   49.438758]    (ftrace buffer empty)
[   49.442434] Kernel Offset: disabled
[   49.446031] Rebooting in 86400 seconds..