======================================
| [   71.853572][   T68] ------------[ cut here ]------------
| [   71.853923][   T68] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 71.854157][ T68] WARNING: CPU: 3 PID: 68 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   71.854462][   T68] Modules linked in: ip_vs_rr bridge stp llc veth ip_vs nf_conntrack_netlink xt_conntrack nft_compat nf_tables nf_conntrack libcrc32c nf_defrag_ipv6 nf_defrag_ipv4 tun
[   71.855254][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   71.855712][   T68] Workqueue: netns cleanup_net
[ 71.855882][ T68] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 71.856047][ T68] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 09 a7 37 02 01 90 ba 3b 00 00 00 48 c7 c6 a0 67 37 a6 48 c7 c7 e0 67 37 a6 e8 c3 8b e7 fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 11 be 71 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 09 a7 37 02 01 	movb   $0x1,0x237a709(%rip)        # 0x237a719
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 a0 67 37 a6 	mov    $0xffffffffa63767a0,%rsi
  1d:	48 c7 c7 e0 67 37 a6 	mov    $0xffffffffa63767e0,%rdi
  24:	e8 c3 8b e7 fd       	call   0xfffffffffde78bec
  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 11 be 71 fe       	call   0xfffffffffe71be4c
  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 11 be 71 fe       	call   0xfffffffffe71be22
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[   71.856622][   T68] RSP: 0018:ffffc90000497a48 EFLAGS: 00010282
[   71.856826][   T68] RAX: 0000000000000000 RBX: ffff888007729000 RCX: 1ffffffff4d7b678
[   71.857061][   T68] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   71.857284][   T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff4d7b678
[   71.857534][   T68] R10: 0000000000000003 R11: ffff8880085c2300 R12: 0000000000000000
[   71.857766][   T68] R13: dffffc0000000000 R14: ffff888007d21000 R15: ffff8880077295b0
[   71.857995][   T68] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   71.858357][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   71.858572][   T68] CR2: 00007fd460adb30a CR3: 000000002ab26002 CR4: 0000000000772ef0
[   71.858806][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   71.859037][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   71.859264][   T68] PKRU: 55555554
[   71.859392][   T68] Call Trace:
[   71.859512][   T68]  <TASK>
[ 71.859598][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 71.859756][ T68] ? __warn (kernel/panic.c:748)
[ 71.859880][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 71.860035][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 71.860197][ T68] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 71.860315][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 71.860480][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 71.860653][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 71.860808][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 71.860963][ T68] rfc2863_policy (net/core/link_watch.c:78)
[ 71.861123][ T68] linkwatch_do_dev (net/core/link_watch.c:180)
[ 71.861276][ T68] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 71.861443][ T68] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 71.861599][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 71.861806][ T68] default_device_exit_batch (net/core/dev.c:12051)
[ 71.861959][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 71.862157][ T68] ? ip_vs_sync_net_cleanup (net/netfilter/ipvs/ip_vs_sync.c:2038) ip_vs
[ 71.862393][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 71.862550][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 71.862706][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 71.862859][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 71.863022][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 71.863174][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 71.863336][ T68] process_one_work (kernel/workqueue.c:3229)
[ 71.863586][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 71.863745][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 71.863906][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 71.864064][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 71.864222][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 71.864489][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 71.864649][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 71.864802][ T68] kthread (kernel/kthread.c:389)
[ 71.864919][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 71.865077][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 71.865232][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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