======================================
| [   23.856356][   T67] ------------[ cut here ]------------
| [   23.856663][   T67] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 23.856900][ T67] WARNING: CPU: 3 PID: 67 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   23.857183][   T67] Modules linked in: act_mirred act_tunnel_key cls_flower bareudp mpls_gso mpls_iptunnel mpls_router sch_ingress
[   23.857857][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.858058][   T67] Workqueue: netns cleanup_net
[ 23.858228][ T67] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 23.858411][ T67] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 08 23 5c 02 01 90 ba 3b 00 00 00 48 c7 c6 00 7c 57 8f 48 c7 c7 40 7c 57 8f e8 b3 b2 e5 fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 81 63 6d fe e9 f7 fd ff ff
All code
========
   0:	83 e4 01             	and    $0x1,%esp
   3:	0f 85 03 ff ff ff    	jne    0xffffffffffffff0c
   9:	c6 05 08 23 5c 02 01 	movb   $0x1,0x25c2308(%rip)        # 0x25c2318
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 00 7c 57 8f 	mov    $0xffffffff8f577c00,%rsi
  1d:	48 c7 c7 40 7c 57 8f 	mov    $0xffffffff8f577c40,%rdi
  24:	e8 b3 b2 e5 fd       	call   0xfffffffffde5b2dc
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	e9 d9 fe ff ff       	jmp    0xffffffffffffff0c
  33:	48 89 ef             	mov    %rbp,%rdi
  36:	e8 81 63 6d fe       	call   0xfffffffffe6d63bc
  3b:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe37

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	e9 d9 fe ff ff       	jmp    0xfffffffffffffee2
   9:	48 89 ef             	mov    %rbp,%rdi
   c:	e8 81 63 6d fe       	call   0xfffffffffe6d6392
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[   23.858964][   T67] RSP: 0018:ffffc90000487a48 EFLAGS: 00010282
[   23.859174][   T67] RAX: 0000000000000000 RBX: ffff888009c8c000 RCX: 1ffffffff1fbdd8c
[   23.859438][   T67] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   23.859683][   T67] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1fbdd8c
[   23.859921][   T67] R10: 0000000000000003 R11: ffff888009300040 R12: 0000000000000000
[   23.860160][   T67] R13: dffffc0000000000 R14: ffff88800ddb9000 R15: ffff888009c8c5c0
[   23.860417][   T67] FS:  0000000000000000(0000) GS:ffff88806d180000(0000) knlGS:0000000000000000
[   23.860714][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   23.860920][   T67] CR2: 00007f0f7fcf38e8 CR3: 000000001913a006 CR4: 0000000000772ef0
[   23.861161][   T67] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   23.861415][   T67] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   23.861745][   T67] PKRU: 55555554
[   23.861873][   T67] Call Trace:
[   23.862003][   T67]  <TASK>
[ 23.862091][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 23.862269][ T67] ? __warn (kernel/panic.c:748)
[ 23.862413][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 23.862576][ T67] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 23.862742][ T67] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 23.862868][ T67] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 23.863034][ T67] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 23.863207][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 23.863384][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 23.863549][ T67] rfc2863_policy (net/core/link_watch.c:78)
[ 23.863721][ T67] linkwatch_do_dev (net/core/link_watch.c:180)
[ 23.863880][ T67] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 23.864044][ T67] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 23.864205][ T67] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 23.864424][ T67] default_device_exit_batch (net/core/dev.c:12051)
[ 23.864584][ T67] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 23.864787][ T67] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 23.864960][ T67] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 23.865121][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 23.865297][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 23.865461][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 23.865627][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 23.865784][ T67] ? process_one_work (kernel/workqueue.c:3205)
[ 23.865951][ T67] process_one_work (kernel/workqueue.c:3229)
[ 23.866123][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 23.866284][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 23.866467][ T67] ? assign_work (kernel/workqueue.c:1200)
[ 23.866631][ T67] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 23.866790][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 23.866996][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 23.867154][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 23.867325][ T67] kthread (kernel/kthread.c:389)
[ 23.867451][ T67] ? __pfx_kthread (kernel/kthread.c:342)
[ 23.867612][ T67] ret_from_fork (arch/x86/kernel/process.c:147)
[ 23.867771][ T67] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
default_operstate:rfc2863_policy:linkwatch_do_dev:netdev_run_todo:default_device_exit_batch