executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 24.023630] ------------[ cut here ]------------ [ 24.024290] WARNING: CPU: 1 PID: 17 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 24.025354] Kernel panic - not syncing: panic_on_warn set ... [ 24.025354] [ 24.026089] CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.0-rc7-next-20171103+ #10 [ 24.027059] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 24.028054] Call Trace: [ 24.028381] dump_stack+0x194/0x257 [ 24.028840] ? arch_local_irq_restore+0x53/0x53 [ 24.029422] ? vsnprintf+0x1ed/0x1900 [ 24.029973] panic+0x1e4/0x41c [ 24.030370] ? refcount_error_report+0x214/0x214 [ 24.030942] ? show_regs_print_info+0x65/0x65 [ 24.031496] ? __warn+0x1a9/0x1e0 [ 24.031933] ? free_kthread_struct+0xa2/0xe0 [ 24.032480] __warn+0x1c4/0x1e0 [ 24.032883] ? free_kthread_struct+0xa2/0xe0 [ 24.033427] report_bug+0x211/0x2d0 [ 24.033944] fixup_bug+0x40/0x90 [ 24.034376] do_trap+0x260/0x390 [ 24.034809] do_error_trap+0x120/0x390 [ 24.035302] ? do_trap+0x390/0x390 [ 24.035741] ? find_held_lock+0x39/0x1d0 [ 24.036168] ? free_kthread_struct+0xa2/0xe0 [ 24.036621] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.037115] do_invalid_op+0x1b/0x20 [ 24.037489] invalid_op+0x18/0x20 [ 24.037910] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 24.038408] RSP: 0018:ffff88003e09f730 EFLAGS: 00010206 [ 24.038947] RAX: ffff88003e086480 RBX: ffff88003bdfa5c0 RCX: ffffffff814937d2 [ 24.039670] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88003bdfa748 [ 24.040389] RBP: ffff88003e09f738 R08: 0000000000000000 R09: 1ffff10007c13ecd [ 24.041110] R10: ffff88003e086480 R11: 0000000000000001 R12: 1ffff10007c13ee9 [ 24.041824] R13: 1ffff10007c13eed R14: 0000000000000000 R15: ffff88003e09f7a8 [ 24.042678] ? free_kthread_struct+0xa2/0xe0 [ 24.043425] free_task+0x134/0x1a0 [ 24.043784] ? arch_release_task_struct+0x10/0x10 [ 24.044279] ? atomic_notifier_call_chain+0xb9/0x140 [ 24.044795] __put_task_struct+0x229/0x3b0 [ 24.045228] ? free_task+0x1a0/0x1a0 [ 24.045664] delayed_put_task_struct+0xca/0x3d0 [ 24.046169] ? child_wait_callback+0x210/0x210 [ 24.046628] ? put_pid+0x183/0x1f0 [ 24.046993] ? task_active_pid_ns+0xd0/0xd0 [ 24.047431] ? rcu_segcblist_extract_pend_cbs+0x1d0/0x1d0 [ 24.047982] ? rcu_process_callbacks+0x115c/0x17d0 [ 24.048489] ? put_pid+0x1f0/0x1f0 [ 24.048850] ? child_wait_callback+0x210/0x210 [ 24.049315] rcu_process_callbacks+0xd74/0x17d0 [ 24.049790] ? rcu_gp_kthread+0x18e0/0x18e0 [ 24.050295] ? check_noncircular+0x20/0x20 [ 24.050720] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.051178] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 24.051679] ? trace_hardirqs_on+0xd/0x10 [ 24.052099] ? mmdrop+0x18/0x30 [ 24.052428] ? finish_task_switch+0x1f6/0x740 [ 24.052878] ? preempt_notifier_dec+0x20/0x20 [ 24.053345] ? __schedule+0x8f3/0x2060 [ 24.053742] ? rcu_pm_notify+0xc0/0xc0 [ 24.054202] __do_softirq+0x29d/0xbb2 [ 24.054591] ? __irqentry_text_end+0x4/0x4 [ 24.055026] ? schedule+0xf5/0x430 [ 24.055396] ? rcu_note_context_switch+0x710/0x710 [ 24.055886] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 24.056484] ? schedule+0xf5/0x430 [ 24.056836] ? run_ksoftirqd+0x8b/0x100 [ 24.057241] ? takeover_tasklets+0xa40/0xa40 [ 24.057679] run_ksoftirqd+0x86/0x100 [ 24.058114] smpboot_thread_fn+0x450/0x7c0 [ 24.058535] ? sort_range+0x30/0x30 [ 24.058897] ? __kthread_parkme+0xcf/0x240 [ 24.059320] ? __kthread_parkme+0x175/0x240 [ 24.059750] kthread+0x3c9/0x4b0 [ 24.060091] ? sort_range+0x30/0x30 [ 24.060449] ? kthread_create_on_node+0x100/0x100 [ 24.060928] ret_from_fork+0x2a/0x40 [ 24.061925] Dumping ftrace buffer: [ 24.062289] (ftrace buffer empty) [ 24.062615] Kernel Offset: disabled [ 24.062944] Rebooting in 86400 seconds..