======================================
| [   13.583217] ------------[ cut here ]------------
| [   13.583304] RTNL: assertion failed at net/core/link_watch.c (59)
| [   13.583391] WARNING: CPU: 2 PID: 66 at net/core/link_watch.c:59 rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
| [   13.583472] Modules linked in: nf_conntrack_netlink nfnetlink_queue nft_queue nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables libcrc32c br_netfilter veth bridge stp llc
[   13.583703] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.583770] Workqueue: netns cleanup_net
[   13.583816] RIP: 0010:rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[ 13.583873] Code: 80 3d f3 7e e7 00 00 75 ca c6 05 ea 7e e7 00 01 90 ba 3b 00 00 00 48 c7 c6 98 2a f8 9f 48 c7 c7 18 14 ea 9f e8 9f b6 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 f3 7e e7 00 00 	cmpb   $0x0,0xe77ef3(%rip)        # 0xe77efa
   7:	75 ca                	jne    0xffffffffffffffd3
   9:	c6 05 ea 7e e7 00 01 	movb   $0x1,0xe77eea(%rip)        # 0xe77efa
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 98 2a f8 9f 	mov    $0xffffffff9ff82a98,%rsi
  1d:	48 c7 c7 18 14 ea 9f 	mov    $0xffffffff9fea1418,%rdi
  24:	e8 9f b6 56 ff       	call   0xffffffffff56b6c8
  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
[   13.584020] RSP: 0018:ffffbb32c0247d10 EFLAGS: 00010286
[   13.584074] RAX: 0000000000000000 RBX: ffff9c894526a000 RCX: 00000000ffffdfff
[   13.584174] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[   13.584268] RBP: 0000000000000000 R08: ffffffffa0356c68 R09: 00000000ffffdfff
[   13.584384] R10: ffffffffa0276c80 R11: ffffffffa0326c80 R12: dead000000000122
[   13.584455] R13: dead000000000100 R14: ffffffff9ff823ef R15: ffff9c8945269000
[   13.584528] FS:  0000000000000000(0000) GS:ffff9c897ed00000(0000) knlGS:0000000000000000
[   13.584600] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   13.584662] CR2: 00007fb01993f470 CR3: 0000000037c42006 CR4: 0000000000772ef0
[   13.584732] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   13.584803] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   13.584874] PKRU: 55555554
[   13.584909] Call Trace:
[   13.584949]  <TASK>
[   13.584986] ? __warn (kernel/panic.c:748)
[   13.585038] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[   13.585084] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[   13.585155] ? prb_read_valid (kernel/printk/printk_ringbuffer.c:2183)
[   13.585203] ? handle_bug (arch/x86/kernel/traps.c:285)
[   13.585250] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[   13.585294] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[   13.585345] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[   13.585389] linkwatch_do_dev (net/core/link_watch.c:180)
[   13.585443] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[   13.585494] ? unregister_netdevice_queue (net/core/dev.c:11456)
[   13.585549] default_device_exit_batch (net/core/dev.c:12077)
[   13.585604] ? sit_exit_batch_rtnl (net/ipv6/sit.c:1812 net/ipv6/sit.c:1886)
[   13.585665] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[   13.585713] process_one_work (kernel/workqueue.c:3229)
[   13.585762] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[   13.585806] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[   13.585874] kthread (kernel/kthread.c:389)
[   13.585922] ? __pfx_kthread (kernel/kthread.c:342)
[   13.585979] ret_from_fork (arch/x86/kernel/process.c:147)
[   13.586028] ? __pfx_kthread (kernel/kthread.c:342)


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