======================================
| [    5.209197] ------------[ cut here ]------------
| [    5.209299] RTNL: assertion failed at net/core/link_watch.c (59)
| [    5.209385] WARNING: CPU: 2 PID: 11 at net/core/link_watch.c:59 rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
| [    5.209461] Modules linked in: xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core
[    5.209605] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.209672] Workqueue: netns cleanup_net
[    5.209719] RIP: 0010:rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[ 5.209768] Code: 80 3d 27 7d 07 01 00 75 ca c6 05 1e 7d 07 01 01 90 ba 3b 00 00 00 48 c7 c6 8d f8 1b 94 48 c7 c7 b0 cc 0d 94 e8 7f 37 56 ff 90 <0f> 0b 90 90 eb a3 83 f8 06 0f 85 14 ff ff ff b8 05 00 00 00 e9 0a
All code
========
   0:	80 3d 27 7d 07 01 00 	cmpb   $0x0,0x1077d27(%rip)        # 0x1077d2e
   7:	75 ca                	jne    0xffffffffffffffd3
   9:	c6 05 1e 7d 07 01 01 	movb   $0x1,0x1077d1e(%rip)        # 0x1077d2e
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 8d f8 1b 94 	mov    $0xffffffff941bf88d,%rsi
  1d:	48 c7 c7 b0 cc 0d 94 	mov    $0xffffffff940dccb0,%rdi
  24:	e8 7f 37 56 ff       	call   0xffffffffff5637a8
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	eb a3                	jmp    0xffffffffffffffd3
  30:	83 f8 06             	cmp    $0x6,%eax
  33:	0f 85 14 ff ff ff    	jne    0xffffffffffffff4d
  39:	b8 05 00 00 00       	mov    $0x5,%eax
  3e:	e9                   	.byte 0xe9
  3f:	0a                   	.byte 0xa

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	eb a3                	jmp    0xffffffffffffffa9
   6:	83 f8 06             	cmp    $0x6,%eax
   9:	0f 85 14 ff ff ff    	jne    0xffffffffffffff23
   f:	b8 05 00 00 00       	mov    $0x5,%eax
  14:	e9                   	.byte 0xe9
  15:	0a                   	.byte 0xa
[    5.209890] RSP: 0018:ffffaab24005fd10 EFLAGS: 00010286
[    5.209940] RAX: 0000000000000000 RBX: ffff92c245310000 RCX: 00000000ffffdfff
[    5.210009] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    5.210089] RBP: 0000000000000000 R08: ffffffff9455a968 R09: 00000000ffffdfff
[    5.210158] R10: ffffffff9447a980 R11: ffffffff9452a980 R12: dead000000000122
[    5.210223] R13: dead000000000100 R14: ffffffff941bf1fe R15: ffff92c245317000
[    5.210291] FS:  0000000000000000(0000) GS:ffff92c27ed00000(0000) knlGS:0000000000000000
[    5.210360] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.210420] CR2: 000055a110377548 CR3: 0000000032446002 CR4: 0000000000772ef0
[    5.210491] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    5.210558] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    5.210623] PKRU: 55555554
[    5.210653] Call Trace:
[    5.210685]  <TASK>
[    5.210719] ? __warn (kernel/panic.c:748)
[    5.210765] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    5.210807] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[    5.210862] ? prb_read_valid (kernel/printk/printk_ringbuffer.c:2183)
[    5.210905] ? handle_bug (arch/x86/kernel/traps.c:285)
[    5.210947] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[    5.210988] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[    5.211033] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    5.211079] linkwatch_do_dev (net/core/link_watch.c:180)
[    5.211129] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[    5.211173] ? unregister_netdevice_queue (net/core/dev.c:11456)
[    5.211220] default_device_exit_batch (net/core/dev.c:12077)
[    5.211277] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[    5.211318] process_one_work (kernel/workqueue.c:3229)
[    5.211361] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[    5.211403] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[    5.211449] kthread (kernel/kthread.c:389)
[    5.211495] ? __pfx_kthread (kernel/kthread.c:342)
[    5.211534] ret_from_fork (arch/x86/kernel/process.c:147)
[    5.211582] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
rfc2863_policy:linkwatch_do_dev:netdev_run_todo:default_device_exit_batch:cleanup_net