------------[ cut here ]------------
WARNING: CPU: 1 PID: 3827 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 kernel/kthread.c:87
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3827 Comm: modprobe Not tainted 4.14.0-rc2-next-20170929+ #32
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:542
 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:ffff8801db307768 EFLAGS: 00010206
RAX: ffff8801c55e8280 RBX: ffff8801c5f600c0 RCX: 1ffff1003b660ee1
RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c5f60248
RBP: ffff8801db307770 R08: 0000000000000000 R09: 1ffff1003b660ed4
R10: ffff8801c55e8280 R11: 0000000000000003 R12: 1ffff1003b660ef0
R13: 1ffff1003b660ef4 R14: 0000000000000000 R15: ffff8801db3077e0
 free_task+0x134/0x1a0 kernel/fork.c:386
 __put_task_struct+0x229/0x3b0 kernel/fork.c:667
 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:ffff8801c54b77e8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: dffffc0000000000 RBX: ffff8801c55e8280 RCX: 0000000000000000
RDX: 1ffffffff0b5970d RSI: ffffffff8192c9ae RDI: 0000000000000286
RBP: ffff8801c54b78e0 R08: ffff8801c54b7260 R09: ffff8801c54b7258
R10: ffff8801c54b71d0 R11: 1ffff10038abd2e3 R12: 1ffff10038a96f03
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 fs_reclaim_acquire.part.85+0x24/0x30 mm/page_alloc.c:3563
 fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3564
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3384 [inline]
 kmem_cache_alloc+0x29/0x760 mm/slab.c:3560
 kmem_cache_zalloc include/linux/slab.h:687 [inline]
 mmap_region+0x7ee/0x15a0 mm/mmap.c:1658
 do_mmap+0x6a1/0xd50 mm/mmap.c:1468
 do_mmap_pgoff include/linux/mm.h:2150 [inline]
 vm_mmap_pgoff+0x1de/0x280 mm/util.c:333
 SYSC_mmap_pgoff mm/mmap.c:1518 [inline]
 SyS_mmap_pgoff+0x23b/0x5f0 mm/mmap.c:1476
 SYSC_mmap arch/x86/kernel/sys_x86_64.c:99 [inline]
 SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:90
 do_syscall_64+0x26c/0x8d0 arch/x86/entry/common.c:287
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x7fd0bdb0d3ea
RSP: 002b:00007ffeb9434408 EFLAGS: 00000202 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fd0bdd159a8 RCX: 00007fd0bdb0d3ea
RDX: 0000000000000003 RSI: 0000000000004838 RDI: 00007fd0bd8dc000
RBP: 00007ffeb9434760 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000032 R11: 0000000000000202 R12: 00007ffeb9434848
R13: 0000000000000002 R14: 00007ffeb9434480 R15: 00007ffeb9434450
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..