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-1,10.128.15.219' (ECDSA) to the list of known hosts.
2017/11/04 07:59:21 parsed 1 programs
2017/11/04 07:59:21 executed programs: 0
syzkaller login: [   58.249137] ------------[ cut here ]------------
[   58.249938] WARNING: CPU: 0 PID: 3908 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0
[   58.251340] Kernel panic - not syncing: panic_on_warn set ...
[   58.251340] 
[   58.252349] CPU: 0 PID: 3908 Comm: modprobe Not tainted 4.14.0-rc7-next-20171103+ #38
[   58.253533] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   58.254869] Call Trace:
[   58.255253]  <IRQ>
[   58.255606]  dump_stack+0x194/0x257
[   58.256118]  ? arch_local_irq_restore+0x53/0x53
[   58.256795]  ? vsnprintf+0x1ed/0x1900
[   58.257335]  panic+0x1e4/0x41c
[   58.257861]  ? refcount_error_report+0x214/0x214
[   58.258648]  ? show_regs_print_info+0x65/0x65
[   58.259300]  ? __warn+0x1a9/0x1e0
[   58.259804]  ? free_kthread_struct+0xa2/0xe0
[   58.260407]  __warn+0x1c4/0x1e0
[   58.260867]  ? free_kthread_struct+0xa2/0xe0
[   58.261480]  report_bug+0x211/0x2d0
[   58.262048]  fixup_bug+0x40/0x90
[   58.262543]  do_trap+0x260/0x390
[   58.263050]  do_error_trap+0x120/0x390
[   58.263592]  ? save_stack+0xa3/0xd0
[   58.264105]  ? do_trap+0x390/0x390
[   58.264612]  ? free_kthread_struct+0xa2/0xe0
[   58.265240]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.265917]  do_invalid_op+0x1b/0x20
[   58.266434]  invalid_op+0x18/0x20
[   58.266935] RIP: 0010:free_kthread_struct+0xa2/0xe0
[   58.267615] RSP: 0000:ffff8801db207768 EFLAGS: 00010206
[   58.268342] RAX: ffff8801d52fa580 RBX: ffff8801d5bc8d40 RCX: ffffffff814937d2
[   58.269321] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801d5bc8ec8
[   58.276574] RBP: ffff8801db207770 R08: 0000000000000000 R09: 1ffff1003b640ed4
[   58.283836] R10: ffff8801d52fa580 R11: 0000000000000001 R12: 1ffff1003b640ef0
[   58.291095] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0
[   58.298373]  ? free_kthread_struct+0xa2/0xe0
[   58.302763]  ? free_kthread_struct+0xa2/0xe0
[   58.307143]  free_task+0x134/0x1a0
[   58.310656]  ? arch_release_task_struct+0x10/0x10
[   58.315476]  ? atomic_notifier_call_chain+0xb9/0x140
[   58.320555]  __put_task_struct+0x229/0x3b0
[   58.324777]  ? free_task+0x1a0/0x1a0
[   58.328475]  delayed_put_task_struct+0xca/0x3d0
[   58.333115]  ? child_wait_callback+0x210/0x210
[   58.337664]  ? put_pid+0x183/0x1f0
[   58.341177]  ? task_active_pid_ns+0xd0/0xd0
[   58.345472]  ? trace_hardirqs_on_caller+0x19e/0x5c0
[   58.350457]  ? put_pid+0x1f0/0x1f0
[   58.353966]  ? child_wait_callback+0x210/0x210
[   58.358522]  rcu_process_callbacks+0xd74/0x17d0
[   58.363176]  ? rcu_gp_kthread+0x18e0/0x18e0
[   58.367466]  ? lock_acquire+0x1d5/0x580
[   58.371412]  ? __hrtimer_run_queues+0x385/0xe10
[   58.376061]  ? find_held_lock+0x39/0x1d0
[   58.380108]  ? lock_downgrade+0x990/0x990
[   58.384234]  ? lock_acquire+0x1d5/0x580
[   58.388178]  ? clockevents_program_event+0x163/0x2e0
[   58.393268]  ? rcu_pm_notify+0xc0/0xc0
[   58.397143]  __do_softirq+0x29d/0xbb2
[   58.400932]  ? __irqentry_text_end+0x4/0x4
[   58.405134]  ? do_raw_spin_trylock+0x190/0x190
[   58.409685]  ? do_timer+0x50/0x50
[   58.413113]  ? native_apic_msr_write+0x5c/0x80
[   58.417665]  ? lapic_next_event+0x54/0x80
[   58.421784]  ? clockevents_program_event+0x108/0x2e0
[   58.426861]  ? tick_program_event+0x7f/0xd0
[   58.431157]  ? hrtimer_interrupt+0x489/0x5f0
[   58.435538]  ? rcu_pm_notify+0xc0/0xc0
[   58.439411]  irq_exit+0x1d3/0x210
[   58.442838]  smp_apic_timer_interrupt+0x16b/0x700
[   58.447648]  ? smp_reschedule_interrupt+0xe6/0x670
[   58.452547]  ? smp_call_function_single_interrupt+0x640/0x640
[   58.458402]  ? _raw_spin_lock+0x32/0x40
[   58.462354]  ? handle_edge_irq+0x2b4/0x7c0
[   58.466558]  ? task_prio+0x40/0x40
[   58.470082]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.474903]  apic_timer_interrupt+0x9d/0xb0
[   58.479189]  </IRQ>
[   58.481396] RIP: 0033:0x7f06c81f3324
[   58.485077] RSP: 002b:00007ffc363538c0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff11
[   58.492755] RAX: 00007f06c8503f98 RBX: 00007f06c8503e98 RCX: 0000000000000110
[   58.499995] RDX: 0000000000000011 RSI: 0000000000000100 RDI: 00007f06c8503e40
[   58.507236] RBP: 00007f06c8503e40 R08: 00007f06c8503f98 R09: 00007f06c82a0070
[   58.514474] R10: 0000000000000000 R11: 6a616d5f72616863 R12: 0000000000000100
[   58.521715] R13: 00007ffc36353a8c R14: 00005625493c3210 R15: 00005625493c34a0
[   58.529530] Dumping ftrace buffer:
[   58.533111]    (ftrace buffer empty)
[   58.536789] Kernel Offset: disabled
[   58.540398] Rebooting in 86400 seconds..