======================================
| Ctrl-C stdout
|
| WAIT TIMEOUT stdout
| [ 1419.112215] Oops: general protection fault, probably for non-canonical address 0xdead000000000122: 0000 [#1] PREEMPT SMP NOPTI
[ 1419.112390] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1419.112461] Workqueue: netns cleanup_net
[ 1419.112497] RIP: 0010:neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 1419.112536] 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
[ 1419.112641] RSP: 0018:ffffb5e040063c10 EFLAGS: 00010246
[ 1419.112685] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000001388
[ 1419.112736] RDX: dead000000000122 RSI: 0000000000000286 RDI: ffff8f7cfec1d070
[ 1419.112801] RBP: ffff8f7cc3456600 R08: ffff8f7cc6c576fc R09: ffff8f7cfec1cf40
[ 1419.112847] R10: ffff8f7cfec1cf58 R11: 0000000000000003 R12: ffffffffb2a2dda0
[ 1419.112901] R13: dead000000000122 R14: 0000000000000000 R15: ffff8f7cc3456840
[ 1419.112950] FS:  0000000000000000(0000) GS:ffff8f7cfec00000(0000) knlGS:0000000000000000
[ 1419.113001] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1419.113045] CR2: 0000561aac426dec CR3: 000000000c7f8002 CR4: 0000000000772ef0
[ 1419.113107] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1419.113156] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1419.113198] PKRU: 55555554
[ 1419.113211] Call Trace:
[ 1419.113230]  <TASK>
[ 1419.113244] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 1419.113281] ? exc_general_protection (arch/x86/kernel/traps.c:748 arch/x86/kernel/traps.c:693) 
[ 1419.113323] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 1419.113361] ? neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 1419.113400] __neigh_ifdown.isra.0 (net/core/neighbour.c:425) 
[ 1419.113440] neigh_ifdown (net/core/neighbour.c:445) 
[ 1419.113479] fib_netdev_event (net/ipv4/fib_frontend.c:1521) 
[ 1419.113507] notifier_call_chain (kernel/notifier.c:93) 
[ 1419.113534] dev_close_many (net/core/dev.c:1590) 
[ 1419.113559] unregister_netdevice_many_notify (net/core/dev.c:11503) 
[ 1419.113595] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 1419.113621] ? unregister_netdevice_queue (net/core/dev.c:11455) 
[ 1419.113659] ? enable_work (kernel/workqueue.c:4296 kernel/workqueue.c:4470) 
[ 1419.113686] default_device_exit_batch (net/core/dev.c:12075) 
[ 1419.113722] cleanup_net (net/core/net_namespace.c:632 (discriminator 3)) 
[ 1419.113750] process_one_work (kernel/workqueue.c:3229) 
[ 1419.113777] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) 
[ 1419.113817] ? __pfx_worker_thread (kernel/workqueue.c:3337) 
[ 1419.113865] kthread (kernel/kthread.c:389) 
[ 1419.113891] ? __pfx_kthread (kernel/kthread.c:342) 
[ 1419.113922] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1419.113952] ? __pfx_kthread (kernel/kthread.c:342) 


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