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-4,10.128.0.13' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 47.493106] ------------[ cut here ]------------ [ 47.494009] WARNING: CPU: 1 PID: 3001 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 47.495571] Kernel panic - not syncing: panic_on_warn set ... [ 47.495571] [ 47.496604] CPU: 1 PID: 3001 Comm: syzkaller733715 Not tainted 4.14.0-rc7-next-20171102+ #37 [ 47.497813] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.499086] Call Trace: [ 47.499465] [ 47.499784] dump_stack+0x194/0x257 [ 47.500294] ? arch_local_irq_restore+0x53/0x53 [ 47.500961] ? vsnprintf+0x1ed/0x1900 [ 47.501515] panic+0x1e4/0x41c [ 47.501959] ? refcount_error_report+0x214/0x214 [ 47.502641] ? show_regs_print_info+0x65/0x65 [ 47.503305] ? __warn+0x1a9/0x1e0 [ 47.503799] ? free_kthread_struct+0xa2/0xe0 [ 47.504400] __warn+0x1c4/0x1e0 [ 47.504856] ? free_kthread_struct+0xa2/0xe0 [ 47.505484] report_bug+0x211/0x2d0 [ 47.506003] fixup_bug+0x40/0x90 [ 47.506479] do_trap+0x260/0x390 [ 47.506985] do_error_trap+0x120/0x390 [ 47.507556] ? save_stack+0xa3/0xd0 [ 47.508087] ? do_trap+0x390/0x390 [ 47.508696] ? free_kthread_struct+0xa2/0xe0 [ 47.509375] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.510388] do_invalid_op+0x1b/0x20 [ 47.510910] invalid_op+0x18/0x20 [ 47.511379] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 47.512064] RSP: 0018:ffff8801db307768 EFLAGS: 00010206 [ 47.512836] RAX: ffff8801cebf8600 RBX: ffff8801c4439040 RCX: ffffffff814937d2 [ 47.517388] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c44391c8 [ 47.524658] RBP: ffff8801db307770 R08: 0000000000000000 R09: 1ffff1003b660ed4 [ 47.531913] R10: ffff8801cebf8600 R11: 0000000000000001 R12: 1ffff1003b660ef0 executing program executing program [ 47.539173] R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0 [ 47.546471] ? free_kthread_struct+0xa2/0xe0 [ 47.550865] ? free_kthread_struct+0xa2/0xe0 [ 47.555252] free_task+0x134/0x1a0 [ 47.558768] ? arch_release_task_struct+0x10/0x10 [ 47.563592] ? atomic_notifier_call_chain+0xb9/0x140 [ 47.568681] __put_task_struct+0x229/0x3b0 [ 47.572898] ? free_task+0x1a0/0x1a0 [ 47.576599] delayed_put_task_struct+0xca/0x3d0 [ 47.581250] ? child_wait_callback+0x210/0x210 [ 47.585813] ? put_pid+0x183/0x1f0 [ 47.589326] ? task_active_pid_ns+0xd0/0xd0 executing program executing program [ 47.593629] ? rcu_process_callbacks+0x115c/0x17d0 [ 47.598539] ? put_pid+0x1f0/0x1f0 [ 47.602060] ? child_wait_callback+0x210/0x210 [ 47.606627] rcu_process_callbacks+0xd74/0x17d0 [ 47.611294] ? rcu_gp_kthread+0x18e0/0x18e0 [ 47.615606] ? timerqueue_add+0x1e9/0x280 [ 47.619737] ? find_held_lock+0x39/0x1d0 [ 47.623819] ? lock_acquire+0x1d5/0x580 [ 47.627781] ? rebalance_domains+0xcc0/0xcc0 [ 47.632194] ? rcu_pm_notify+0xc0/0xc0 [ 47.636098] __do_softirq+0x29d/0xbb2 executing program [ 47.639896] ? __irqentry_text_end+0x4/0x4 [ 47.644103] ? do_raw_spin_trylock+0x190/0x190 [ 47.648674] ? do_timer+0x50/0x50 [ 47.652113] ? native_apic_msr_write+0x5c/0x80 [ 47.656678] ? kvm_clock_get_cycles+0x25/0x30 [ 47.661167] ? lapic_next_event+0x54/0x80 [ 47.665309] ? clockevents_program_event+0x108/0x2e0 [ 47.670400] ? tick_program_event+0x7f/0xd0 [ 47.674701] ? hrtimer_interrupt+0x489/0x5f0 [ 47.679099] ? rcu_pm_notify+0xc0/0xc0 [ 47.682988] irq_exit+0x1d3/0x210 [ 47.686430] smp_apic_timer_interrupt+0x16b/0x700 executing program executing program [ 47.691264] ? smp_reschedule_interrupt+0xe6/0x670 [ 47.696191] ? smp_call_function_single_interrupt+0x640/0x640 [ 47.702062] ? _raw_spin_lock+0x32/0x40 [ 47.706025] ? handle_edge_irq+0x2b4/0x7c0 [ 47.710247] ? task_prio+0x40/0x40 [ 47.713793] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.718644] apic_timer_interrupt+0x9d/0xb0 [ 47.722948] [ 47.725175] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 47.730254] RSP: 0018:ffff8801ce1477f8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11 executing program executing program [ 47.737937] RAX: dffffc0000000000 RBX: ffff8801db325c80 RCX: 0000000000000000 [ 47.745177] RDX: 1ffffffff0bd9673 RSI: 0000000000000001 RDI: ffffffff85ecb398 [ 47.752420] RBP: ffff8801ce147800 R08: 0000000000000000 R09: 0000000000000000 [ 47.759664] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce644140 [ 47.766907] R13: 1ffff10039c28f08 R14: ffff8801cebf8600 R15: ffff8801cebf8600 [ 47.774199] ? _raw_spin_unlock_irq+0x27/0x70 [ 47.778693] finish_task_switch+0x1d3/0x740 [ 47.782999] ? finish_task_switch+0x1aa/0x740 [ 47.787478] ? preempt_notifier_dec+0x20/0x20 executing program executing program [ 47.792585] __schedule+0x8f3/0x2060 [ 47.796308] ? __sched_text_start+0x8/0x8 [ 47.800447] ? timerqueue_add+0x1e9/0x280 [ 47.804597] ? do_raw_spin_trylock+0x190/0x190 [ 47.809178] ? __remove_hrtimer+0x190/0x190 [ 47.813490] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 47.818570] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.823562] ? trace_hardirqs_on+0xd/0x10 [ 47.827705] schedule+0xf5/0x430 [ 47.831065] ? __schedule+0x2060/0x2060 [ 47.835048] ? do_wait+0x4f0/0xa70 [ 47.838603] do_nanosleep+0x224/0x6e0 executing program executing program [ 47.842401] ? schedule_timeout_idle+0x90/0x90 [ 47.846958] ? lock_downgrade+0x990/0x990 [ 47.851086] ? rcu_pm_notify+0xc0/0xc0 [ 47.854953] ? memset+0x31/0x40 [ 47.858219] hrtimer_nanosleep+0x2b2/0x860 [ 47.862427] ? SyS_waitid+0x50/0x50 [ 47.866047] ? nanosleep_copyout+0x100/0x100 [ 47.870435] ? __might_sleep+0x95/0x190 [ 47.874390] ? kasan_check_write+0x14/0x20 [ 47.878607] ? _copy_from_user+0x99/0x110 [ 47.882764] ? __hrtimer_init+0x140/0x140 [ 47.886930] SyS_nanosleep+0x175/0x1f0 [ 47.890825] ? hrtimer_nanosleep+0x860/0x860 executing program [ 47.895224] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 47.900225] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 47.904975] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 47.909715] RIP: 0033:0x4442b0 [ 47.912890] RSP: 002b:00007ffcc260f278 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 [ 47.920589] RAX: ffffffffffffffda RBX: 0000000000001284 RCX: 00000000004442b0 [ 47.927846] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffcc260f280 [ 47.935090] RBP: 0000000000000086 R08: 0000000000000bb9 R09: 00000000025cb880 executing program [ 47.942337] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001284 [ 47.950113] R13: 0000000000406e20 R14: 0000000000000000 R15: 0000000000000000 [ 47.957952] Dumping ftrace buffer: [ 47.961527] (ftrace buffer empty) [ 47.965205] Kernel Offset: disabled [ 47.968801] Rebooting in 86400 seconds..