======================================
| [    6.503164] ------------[ cut here ]------------
| [    6.503217] RTNL: assertion failed at net/core/link_watch.c (59)
| [    6.503285] WARNING: CPU: 1 PID: 64 at net/core/link_watch.c:59 rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
| [    6.503347] Modules linked in:
[    6.503436] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.503478] Workqueue: netns cleanup_net
[    6.503509] RIP: 0010:rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[ 6.503550] 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 7b bc 48 c7 c7 b0 cc 6d bc 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 7b bc 	mov    $0xffffffffbc7bf88d,%rsi
  1d:	48 c7 c7 b0 cc 6d bc 	mov    $0xffffffffbc6dccb0,%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
[    6.503667] RSP: 0018:ffff9ff14023fd10 EFLAGS: 00010286
[    6.503702] RAX: 0000000000000000 RBX: ffff8ab302ed3000 RCX: 00000000ffffdfff
[    6.503752] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    6.503803] RBP: 0000000000000000 R08: ffffffffbcb5a968 R09: 00000000ffffdfff
[    6.503853] R10: ffffffffbca7a980 R11: ffffffffbcb2a980 R12: dead000000000122
[    6.503904] R13: dead000000000100 R14: ffffffffbc7bf1fe R15: ffff8ab302ed6000
[    6.503956] FS:  0000000000000000(0000) GS:ffff8ab33ec80000(0000) knlGS:0000000000000000
[    6.504012] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.504059] CR2: 00007fb1039a67f0 CR3: 0000000034e46002 CR4: 0000000000772ef0
[    6.504115] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    6.504171] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    6.504222] PKRU: 55555554
[    6.504239] Call Trace:
[    6.504257]  <TASK>
[    6.504279] ? __warn (kernel/panic.c:748)
[    6.504309] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    6.504335] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[    6.504367] ? prb_read_valid (kernel/printk/printk_ringbuffer.c:2183)
[    6.504398] ? handle_bug (arch/x86/kernel/traps.c:285)
[    6.504430] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[    6.504461] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[    6.504494] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    6.504524] linkwatch_do_dev (net/core/link_watch.c:180)
[    6.504550] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[    6.504582] ? unregister_netdevice_queue (net/core/dev.c:11456)
[    6.504622] default_device_exit_batch (net/core/dev.c:12077)
[    6.504662] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[    6.504693] process_one_work (kernel/workqueue.c:3229)
[    6.504726] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[    6.504756] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[    6.504790] kthread (kernel/kthread.c:389)
[    6.504821] ? __pfx_kthread (kernel/kthread.c:342)
[    6.504847] ret_from_fork (arch/x86/kernel/process.c:147)
[    6.504885] ? __pfx_kthread (kernel/kthread.c:342)


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