======================================
| [    2.165955] ip (254) used greatest stack depth: 12288 bytes left
| [    2.839396] ip (285) used greatest stack depth: 12272 bytes left
| [   17.322931] mpls_gso: MPLS GSO support
| [   31.986322] Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] PREEMPT SMP NOPTI
[   31.986498] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   31.986617] Workqueue: netns cleanup_net
[   31.986672] RIP: 0010:neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 31.986727] Code: 89 d6 48 83 ed 10 0f 84 08 01 00 00 48 8b 5d 10 45 84 f6 74 0d 80 bd 9c 00 00 00 00 0f 88 e0 00 00 00 48 8b 45 00 48 8b 55 08 <48> 89 02 48 85 c0 74 04 48 89 50 08 48 8b 45 10 48 8b 55 18 4c 89
All code
========
   0:	89 d6                	mov    %edx,%esi
   2:	48 83 ed 10          	sub    $0x10,%rbp
   6:	0f 84 08 01 00 00    	je     0x114
   c:	48 8b 5d 10          	mov    0x10(%rbp),%rbx
  10:	45 84 f6             	test   %r14b,%r14b
  13:	74 0d                	je     0x22
  15:	80 bd 9c 00 00 00 00 	cmpb   $0x0,0x9c(%rbp)
  1c:	0f 88 e0 00 00 00    	js     0x102
  22:	48 8b 45 00          	mov    0x0(%rbp),%rax
  26:	48 8b 55 08          	mov    0x8(%rbp),%rdx
  2a:*	48 89 02             	mov    %rax,(%rdx)		<-- trapping instruction
  2d:	48 85 c0             	test   %rax,%rax
  30:	74 04                	je     0x36
  32:	48 89 50 08          	mov    %rdx,0x8(%rax)
  36:	48 8b 45 10          	mov    0x10(%rbp),%rax
  3a:	48 8b 55 18          	mov    0x18(%rbp),%rdx
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	48 89 02             	mov    %rax,(%rdx)
   3:	48 85 c0             	test   %rax,%rax
   6:	74 04                	je     0xc
   8:	48 89 50 08          	mov    %rdx,0x8(%rax)
   c:	48 8b 45 10          	mov    0x10(%rbp),%rax
  10:	48 8b 55 18          	mov    0x18(%rbp),%rdx
  14:	4c                   	rex.WR
  15:	89                   	.byte 0x89
[   31.986910] RSP: 0018:ffffbf5c00063c10 EFLAGS: 00010246
[   31.986967] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000001388
[   31.987044] RDX: dead000000000122 RSI: 0000000000000286 RDI: ffff9d6a3ec9d070
[   31.987127] RBP: ffff9d6a021d5200 R08: ffff9d6a02d7b4bc R09: ffff9d6a3ec9cf40
[   31.987211] R10: ffff9d6a3ec9cf58 R11: 0000000000000005 R12: ffffffffaae2dda0
[   31.987293] R13: dead000000000122 R14: 0000000000000000 R15: ffff9d6a03cd8e40
[   31.987368] FS:  0000000000000000(0000) GS:ffff9d6a3ec80000(0000) knlGS:0000000000000000
[   31.987432] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   31.987486] CR2: 000056101422ddec CR3: 0000000002f4a005 CR4: 0000000000772ef0
[   31.987546] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   31.987606] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   31.987670] PKRU: 55555554
[   31.987697] Call Trace:
[   31.987725]  <TASK>
[   31.987751] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[   31.987789] ? exc_general_protection (arch/x86/kernel/traps.c:748 arch/x86/kernel/traps.c:693) 
[   31.987853] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[   31.987909] ? neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[   31.987971] __neigh_ifdown.isra.0 (net/core/neighbour.c:425) 
[   31.988031] neigh_ifdown (net/core/neighbour.c:445) 
[   31.988075] fib_netdev_event (net/ipv4/fib_frontend.c:1521) 
[   31.988130] notifier_call_chain (kernel/notifier.c:93) 
[   31.988168] dev_close_many (net/core/dev.c:1590) 
[   31.988200] unregister_netdevice_many_notify (net/core/dev.c:11503) 
[   31.988261] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[   31.988302] ? unregister_netdevice_queue (net/core/dev.c:11455) 
[   31.988369] default_device_exit_batch (net/core/dev.c:12075) 
[   31.988429] cleanup_net (net/core/net_namespace.c:632 (discriminator 3)) 
[   31.988485] process_one_work (kernel/workqueue.c:3229) 
[   31.988536] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) 
[   31.988584] ? __pfx_worker_thread (kernel/workqueue.c:3337) 
[   31.988645] kthread (kernel/kthread.c:389) 
[   31.988695] ? __pfx_kthread (kernel/kthread.c:342) 
[   31.988750] ret_from_fork (arch/x86/kernel/process.c:147) 
[   31.988793] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
neigh_ifdown:fib_netdev_event:notifier_call_chain:dev_close_many:unregister_netdevice_many_notify