======================================
| [   20.664384][   T69] ------------[ cut here ]------------
| [   20.664677][   T69] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 20.664911][ T69] WARNING: CPU: 0 PID: 69 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   20.665185][   T69] Modules linked in: ip_vs_rr bridge stp llc veth ip_vs nf_conntrack libcrc32c nf_defrag_ipv6 nf_defrag_ipv4
[   20.665883][   T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.666087][   T69] Workqueue: netns cleanup_net
[ 20.666248][ T69] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 20.666433][ T69] 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 d7 8d 48 c7 c7 e0 67 d7 8d 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 d7 8d 	mov    $0xffffffff8dd767a0,%rsi
  1d:	48 c7 c7 e0 67 d7 8d 	mov    $0xffffffff8dd767e0,%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
[   20.667011][   T69] RSP: 0018:ffffc900004a7a48 EFLAGS: 00010282
[   20.667218][   T69] RAX: 0000000000000000 RBX: ffff888002b01000 RCX: 1ffffffff1cbb678
[   20.667485][   T69] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   20.667731][   T69] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1cbb678
[   20.667977][   T69] R10: 0000000000000003 R11: ffff888008ff45c0 R12: 0000000000000000
[   20.668230][   T69] R13: dffffc0000000000 R14: ffff888008a31000 R15: ffff888002b015b0
[   20.668482][   T69] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   20.668758][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   20.668957][   T69] CR2: 00007f142231c000 CR3: 000000000c324001 CR4: 0000000000772ef0
[   20.669351][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   20.669598][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   20.669834][   T69] PKRU: 55555554
[   20.669964][   T69] Call Trace:
[   20.670088][   T69]  <TASK>
[ 20.670176][ T69] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 20.670353][ T69] ? __warn (kernel/panic.c:748)
[ 20.670480][ T69] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 20.670652][ T69] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 20.670818][ T69] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 20.670941][ T69] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 20.671093][ T69] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 20.671276][ T69] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 20.671437][ T69] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 20.671594][ T69] rfc2863_policy (net/core/link_watch.c:78)
[ 20.671754][ T69] linkwatch_do_dev (net/core/link_watch.c:180)
[ 20.671918][ T69] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 20.672086][ T69] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 20.672245][ T69] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 20.672460][ T69] default_device_exit_batch (net/core/dev.c:12051)
[ 20.672622][ T69] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 20.672820][ T69] ? ip_vs_sync_net_cleanup (net/netfilter/ipvs/ip_vs_sync.c:2038) ip_vs
[ 20.673034][ T69] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 20.673200][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 20.673373][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 20.673531][ T69] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 20.673706][ T69] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 20.673866][ T69] ? process_one_work (kernel/workqueue.c:3205)
[ 20.674035][ T69] process_one_work (kernel/workqueue.c:3229)
[ 20.674203][ T69] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 20.674373][ T69] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 20.674543][ T69] ? assign_work (kernel/workqueue.c:1200)
[ 20.674708][ T69] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 20.674865][ T69] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 20.675059][ T69] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 20.675217][ T69] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 20.675387][ T69] kthread (kernel/kthread.c:389)
[ 20.675515][ T69] ? __pfx_kthread (kernel/kthread.c:342)
[ 20.675675][ T69] ret_from_fork (arch/x86/kernel/process.c:147)
[ 20.675834][ T69] ? __pfx_kthread (kernel/kthread.c:342)


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