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-8,10.128.0.53' (ECDSA) to the list of known hosts. 2017/11/05 04:47:59 parsed 1 programs 2017/11/05 04:47:59 executed programs: 0 syzkaller login: [ 41.872083] ------------[ cut here ]------------ [ 41.872859] WARNING: CPU: 0 PID: 3038 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 41.874166] Kernel panic - not syncing: panic_on_warn set ... [ 41.874166] [ 41.875137] CPU: 0 PID: 3038 Comm: syz-executor6 Not tainted 4.14.0-rc5-mm1+ #20 [ 41.876124] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.877372] Call Trace: [ 41.877740] [ 41.878046] dump_stack+0x194/0x257 [ 41.878536] ? arch_local_irq_restore+0x53/0x53 [ 41.879162] ? vsnprintf+0x1ed/0x1900 [ 41.879680] panic+0x1e4/0x41c [ 41.880116] ? refcount_error_report+0x214/0x214 [ 41.880748] ? show_regs_print_info+0x65/0x65 [ 41.881354] ? __warn+0x1a9/0x1e0 [ 41.881826] ? free_kthread_struct+0xa2/0xe0 [ 41.882413] __warn+0x1c4/0x1e0 [ 41.882858] ? free_kthread_struct+0xa2/0xe0 [ 41.883533] report_bug+0x211/0x2d0 [ 41.884045] fixup_bug+0x40/0x90 [ 41.884501] do_trap+0x260/0x390 [ 41.884966] do_error_trap+0x120/0x390 [ 41.885586] ? save_stack+0xa3/0xd0 [ 41.886094] ? do_trap+0x390/0x390 [ 41.886584] ? delayed_put_task_struct+0xca/0x3d0 [ 41.887227] ? free_kthread_struct+0xa2/0xe0 [ 41.887813] ? smp_apic_timer_interrupt+0x16b/0x700 [ 41.888477] ? apic_timer_interrupt+0x9d/0xb0 [ 41.889075] ? _raw_spin_unlock_irq+0x56/0x70 [ 41.889688] ? finish_task_switch+0x1d3/0x740 [ 41.890286] ? __schedule+0x8f3/0x2060 [ 41.890804] ? schedule+0xf5/0x430 [ 41.891279] ? do_nanosleep+0x224/0x6e0 [ 41.891816] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 41.892468] do_invalid_op+0x1b/0x20 [ 41.896147] invalid_op+0x18/0x20 [ 41.899568] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 41.904545] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 [ 41.909875] RAX: ffff8801d1d2a040 RBX: ffff8801c5ea5d00 RCX: ffffffff8148d7e2 [ 41.917111] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c5ea5db8 [ 41.924346] RBP: ffff8801db207770 R08: 0000000000000001 R09: 1ffff1003b640edc [ 41.931582] R10: ffff8801db2076a8 R11: 0000000000000001 R12: 1ffff1003b640ef0 [ 41.938816] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 41.946066] ? free_kthread_struct+0xa2/0xe0 [ 41.950448] ? free_kthread_struct+0xa2/0xe0 [ 41.954825] free_task+0x134/0x1a0 [ 41.958333] ? arch_release_task_struct+0x10/0x10 [ 41.963150] ? atomic_notifier_call_chain+0xb9/0x140 [ 41.968225] __put_task_struct+0x229/0x3b0 [ 41.972428] ? free_task+0x1a0/0x1a0 [ 41.976118] delayed_put_task_struct+0xca/0x3d0 [ 41.980752] ? child_wait_callback+0x210/0x210 [ 41.985298] ? put_pid+0x183/0x1f0 [ 41.988807] ? task_active_pid_ns+0xd0/0xd0 [ 41.993100] ? rcu_process_callbacks+0x115c/0x17d0 [ 41.997995] ? put_pid+0x1f0/0x1f0 [ 42.001503] ? child_wait_callback+0x210/0x210 [ 42.006053] rcu_process_callbacks+0xd74/0x17d0 [ 42.010701] ? note_gp_changes+0x650/0x650 [ 42.014906] ? timerqueue_add+0x1e9/0x280 [ 42.019026] ? enqueue_hrtimer+0x162/0x490 [ 42.023230] ? __remove_hrtimer+0x190/0x190 [ 42.027540] ? rebalance_domains+0xcc0/0xcc0 [ 42.031923] ? rcu_pm_notify+0xc0/0xc0 [ 42.035791] __do_softirq+0x2d7/0xb85 [ 42.039564] ? lock_downgrade+0x990/0x990 [ 42.043682] ? __irqentry_text_end+0x4/0x4 [ 42.047882] ? do_raw_spin_trylock+0x190/0x190 [ 42.052433] ? do_timer+0x50/0x50 [ 42.055854] ? native_apic_msr_write+0x5c/0x80 [ 42.060403] ? lapic_next_event+0x54/0x80 [ 42.064518] ? clockevents_program_event+0x108/0x2e0 [ 42.069676] ? tick_program_event+0x7f/0xd0 [ 42.073965] ? hrtimer_interrupt+0x46e/0x5e0 [ 42.078341] ? rcu_pm_notify+0xc0/0xc0 [ 42.082208] irq_exit+0x1cc/0x200 [ 42.085629] smp_apic_timer_interrupt+0x16b/0x700 [ 42.090439] ? smp_reschedule_interrupt+0xe6/0x670 [ 42.095335] ? smp_call_function_single_interrupt+0x640/0x640 [ 42.101188] ? _raw_spin_lock+0x32/0x40 [ 42.105138] ? handle_edge_irq+0x2b4/0x7c0 [ 42.109350] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.114165] apic_timer_interrupt+0x9d/0xb0 [ 42.118450] [ 42.120655] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 42.125724] RSP: 0018:ffff8801d23777f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 42.133396] RAX: dffffc0000000000 RBX: ffff8801db2256c0 RCX: 0000000000000000 [ 42.140633] RDX: 1ffffffff0b58f3b RSI: 0000000000000001 RDI: ffffffff85ac79d8 [ 42.147868] RBP: ffff8801d2377800 R08: 0000000000000001 R09: 0000000000000000 [ 42.155103] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d2744300 [ 42.162340] R13: 1ffff1003a46ef08 R14: ffff8801d1d2a040 R15: ffff8801d1d2a040 [ 42.169598] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.174063] finish_task_switch+0x1d3/0x740 [ 42.178357] ? finish_task_switch+0x1aa/0x740 [ 42.182828] ? preempt_notifier_dec+0x20/0x20 [ 42.187303] __schedule+0x8f3/0x2060 [ 42.190991] ? __sched_text_start+0x8/0x8 [ 42.195109] ? hrtimer_start_range_ns+0x687/0xeb0 [ 42.199919] ? lock_downgrade+0x990/0x990 [ 42.204037] ? do_raw_spin_trylock+0x190/0x190 [ 42.208593] ? __remove_hrtimer+0x190/0x190 [ 42.212890] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 42.217964] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.222945] ? trace_hardirqs_on+0xd/0x10 [ 42.227068] schedule+0xf5/0x430 [ 42.230404] ? __schedule+0x2060/0x2060 [ 42.234352] ? check_noncircular+0x20/0x20 [ 42.238551] ? do_wait+0x4f0/0xa70 [ 42.242061] ? wait_consider_task+0x33c0/0x33c0 [ 42.246702] do_nanosleep+0x224/0x6e0 [ 42.250474] ? schedule_timeout_idle+0x90/0x90 [ 42.255020] ? find_held_lock+0x35/0x1d0 [ 42.259054] ? rcu_pm_notify+0xc0/0xc0 [ 42.262911] ? memset+0x31/0x40 [ 42.266169] hrtimer_nanosleep+0x2b2/0x860 [ 42.270368] ? SyS_waitid+0x50/0x50 [ 42.273964] ? nanosleep_copyout+0x100/0x100 [ 42.278337] ? __might_sleep+0x95/0x190 [ 42.282287] ? kasan_check_write+0x14/0x20 [ 42.286489] ? _copy_from_user+0x99/0x110 [ 42.290609] ? __hrtimer_init+0x140/0x140 [ 42.294743] SyS_nanosleep+0x175/0x1f0 [ 42.298601] ? hrtimer_nanosleep+0x860/0x860 [ 42.302973] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 42.307963] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 42.312695] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 42.317415] RIP: 0033:0x47deb0 [ 42.320571] RSP: 002b:00007ffef0ac01a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 [ 42.328246] RAX: ffffffffffffffda RBX: 0000000002881914 RCX: 000000000047deb0 [ 42.335483] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffef0ac01b0 [ 42.342719] RBP: 0000000000000082 R08: 0000000000000bde R09: 0000000002881940 [ 42.349954] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000e1a [ 42.357192] R13: 0000000000000008 R14: 000000000000a312 R15: 0000000000000016 [ 42.364907] Dumping ftrace buffer: [ 42.368459] (ftrace buffer empty) [ 42.372139] Kernel Offset: disabled [ 42.375735] Rebooting in 86400 seconds..