------------[ cut here ]------------
WARNING: CPU: 0 PID: 3527 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3527 Comm: modprobe Not tainted 4.14.0-rc3-mm1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 panic+0x1e4/0x41c kernel/panic.c:181
 __warn+0x1c4/0x1e0 kernel/panic.c:544
 report_bug+0x211/0x2d0 lib/bug.c:183
 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
 do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
RSP: 0018:ffff8801db207768 EFLAGS: 00010206
RAX: 0000000080000101 RBX: ffff8801c730d000 RCX: 1ffff1003b640ee1
RDX: ffff8801c729e000 RSI: 0000000000000000 RDI: ffff8801c730d188
RBP: ffff8801db207770 R08: 0000000000000000 R09: 1ffff1003b640ed4
R10: ffff8801c729e000 R11: 0000000000000002 R12: 1ffff1003b640ef0
R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0
 free_task+0x134/0x1a0 kernel/fork.c:386
 __put_task_struct+0x229/0x3b0 kernel/fork.c:670
 put_task_struct include/linux/sched/task.h:95 [inline]
 delayed_put_task_struct+0xca/0x3d0 kernel/exit.c:180
 __rcu_reclaim kernel/rcu/rcu.h:195 [inline]
 rcu_do_batch kernel/rcu/tree.c:2758 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
 rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
 __do_softirq+0x29d/0xbb2 kernel/softirq.c:284
 invoke_softirq kernel/softirq.c:364 [inline]
 irq_exit+0x1d3/0x210 kernel/softirq.c:405
 exiting_irq arch/x86/include/asm/apic.h:540 [inline]
 smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1041
 apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:777 [inline]
RIP: 0010:lock_acquire+0x256/0x580 kernel/locking/lockdep.c:4005
RSP: 0018:ffff8801c6c07d10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: dffffc0000000000 RBX: ffff8801c729e000 RCX: 0000000000000000
RDX: 1ffffffff0b5970d RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffff8801c6c07e08 R08: 0000000000000000 R09: 0000000000000000
R10: 1ffff10038d80ebe R11: 1ffff10038e53e93 R12: 1ffff10038d80fa8
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:316 [inline]
 __close_fd+0x95/0x3d0 fs/file.c:626
 SYSC_close fs/open.c:1155 [inline]
 SyS_close+0x4c/0x90 fs/open.c:1153
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x7fcfb16aa1d7
RSP: 002b:00007ffcab9194d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fcfb18b24c8 RCX: 00007fcfb16aa1d7
RDX: 00007fcfb1692e40 RSI: 0000000000000030 RDI: 0000000000000000
RBP: 0000000000000086 R08: 0000000070000029 R09: 000000006ffffdff
R10: 000000006ffffeff R11: 0000000000000246 R12: 00007ffcab919728
R13: 000000006fffff48 R14: 00007ffcab919420 R15: 00007ffcab9193c0
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..