======================================
| xx__-> [    4.781050] ------------[ cut here ]------------
| [    4.781116] RTNL: assertion failed at net/core/link_watch.c (59)
| [    4.781186] WARNING: CPU: 3 PID: 11 at net/core/link_watch.c:59 rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
| [    4.781255] Modules linked in: nf_conntrack_netlink tcp_diag inet_diag nf_conntrack_ftp nft_ct nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth ts_kmp ts_bm xt_string nft_compat nf_tables libcrc32c dummy
[    4.781466] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.781514] Workqueue: netns cleanup_net
[    4.781550] RIP: 0010:rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[ 4.781594] 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 38 a3 48 c7 c7 18 14 2a a3 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 38 a3 	mov    $0xffffffffa3382a98,%rsi
  1d:	48 c7 c7 18 14 2a a3 	mov    $0xffffffffa32a1418,%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
[    4.781728] RSP: 0018:ffffc238c005fd10 EFLAGS: 00010286
[    4.781773] RAX: 0000000000000000 RBX: ffff9d8787e00000 RCX: 00000000ffffdfff
[    4.781829] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.781896] RBP: 0000000000000000 R08: ffffffffa3756c68 R09: 00000000ffffdfff
[    4.781972] R10: ffffffffa3676c80 R11: ffffffffa3726c80 R12: dead000000000122
[    4.782043] R13: dead000000000100 R14: ffffffffa33823ef R15: ffff9d8787e01000
[    4.782129] FS:  0000000000000000(0000) GS:ffff9d87bed80000(0000) knlGS:0000000000000000
[    4.782195] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.782250] CR2: 00007fb44d4478e8 CR3: 0000000028642002 CR4: 0000000000772ef0
[    4.782308] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    4.782374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    4.782453] PKRU: 55555554
[    4.782471] Call Trace:
[    4.782492]  <TASK>
[    4.782519] ? __warn (kernel/panic.c:748)
[    4.782568] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    4.782603] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[    4.782641] ? prb_read_valid (kernel/printk/printk_ringbuffer.c:2183)
[    4.782681] ? handle_bug (arch/x86/kernel/traps.c:285)
[    4.782715] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[    4.782751] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[    4.782794] ? rfc2863_policy (net/core/link_watch.c:59 net/core/link_watch.c:76)
[    4.782833] linkwatch_do_dev (net/core/link_watch.c:180)
[    4.782881] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[    4.782962] ? unregister_netdevice_queue (net/core/dev.c:11456)
[    4.783033] default_device_exit_batch (net/core/dev.c:12077)
[    4.783111] ? sit_exit_batch_rtnl (net/ipv6/sit.c:1812 net/ipv6/sit.c:1886)
[    4.783173] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[    4.783213] process_one_work (kernel/workqueue.c:3229)
[    4.783261] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[    4.783301] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[    4.783354] kthread (kernel/kthread.c:389)
[    4.783402] ? __pfx_kthread (kernel/kthread.c:342)
[    4.783448] ret_from_fork (arch/x86/kernel/process.c:147)
[    4.783495] ? __pfx_kthread (kernel/kthread.c:342)


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