======================================
| xx__-> [   38.733499][   T68] ------------[ cut here ]------------
| [   38.733860][   T68] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 38.734128][ T68] WARNING: CPU: 2 PID: 68 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   38.734474][   T68] Modules linked in:
[   38.735053][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   38.735297][   T68] Workqueue: netns cleanup_net
[ 38.735499][ T68] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 38.735690][ T68] 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 b7 a0 48 c7 c7 40 7c b7 a0 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 b7 a0 	mov    $0xffffffffa0b77c00,%rsi
  1d:	48 c7 c7 40 7c b7 a0 	mov    $0xffffffffa0b77c40,%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
[   38.736326][   T68] RSP: 0018:ffffc90000497a48 EFLAGS: 00010282
[   38.736578][   T68] RAX: 0000000000000000 RBX: ffff888008ee9000 RCX: 1ffffffff427dd8c
[   38.736850][   T68] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   38.737134][   T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff427dd8c
[   38.737427][   T68] R10: 0000000000000003 R11: ffff888008efa300 R12: 0000000000000000
[   38.737695][   T68] R13: dffffc0000000000 R14: ffff8880051f1000 R15: ffff888008ee95c0
[   38.737967][   T68] FS:  0000000000000000(0000) GS:ffff888066100000(0000) knlGS:0000000000000000
[   38.738299][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   38.738529][   T68] CR2: 00007f8d77fda000 CR3: 000000006bd3a006 CR4: 0000000000772ef0
[   38.738807][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   38.739085][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   38.739372][   T68] PKRU: 55555554
[   38.739533][   T68] Call Trace:
[   38.739688][   T68]  <TASK>
[ 38.739802][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 38.739992][ T68] ? __warn (kernel/panic.c:748)
[ 38.740146][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 38.740356][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 38.740553][ T68] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 38.740699][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 38.740888][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 38.741084][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 38.741304][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 38.741496][ T68] rfc2863_policy (net/core/link_watch.c:78)
[ 38.741704][ T68] linkwatch_do_dev (net/core/link_watch.c:180)
[ 38.741892][ T68] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 38.742081][ T68] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 38.742346][ T68] ? vrf_dellink (drivers/net/vrf.c:1668)
[ 38.742597][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 38.742903][ T68] default_device_exit_batch (net/core/dev.c:12051)
[ 38.743159][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 38.743459][ T68] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 38.743731][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 38.743976][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 38.744252][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 38.744503][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 38.744752][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 38.744937][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 38.745144][ T68] process_one_work (kernel/workqueue.c:3229)
[ 38.745356][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 38.745544][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 38.745755][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 38.745950][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 38.746136][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 38.746382][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 38.746572][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 38.746757][ T68] kthread (kernel/kthread.c:389)
[ 38.746907][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 38.747096][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 38.747301][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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