======================================
| [   32.686162][   T67] ------------[ cut here ]------------
| [   32.686474][   T67] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 32.686722][ T67] WARNING: CPU: 2 PID: 67 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   32.687011][   T67] Modules linked in:
[   32.687467][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.687676][   T67] Workqueue: netns cleanup_net
[ 32.687855][ T67] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.688035][ 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 b7 ad 48 c7 c7 40 7c b7 ad 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 ad 	mov    $0xffffffffadb77c00,%rsi
  1d:	48 c7 c7 40 7c b7 ad 	mov    $0xffffffffadb77c40,%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
[   32.688624][   T67] RSP: 0018:ffffc90000487a48 EFLAGS: 00010282
[   32.688836][   T67] RAX: 0000000000000000 RBX: ffff8880086d1000 RCX: 1ffffffff5c7dd8c
[   32.689169][   T67] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   32.689576][   T67] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff5c7dd8c
[   32.689872][   T67] R10: 0000000000000003 R11: ffff888008b78040 R12: 0000000000000000
[   32.690202][   T67] R13: dffffc0000000000 R14: ffff8880086c9000 R15: ffff8880086d15c0
[   32.690508][   T67] FS:  0000000000000000(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000
[   32.690841][   T67] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.691130][   T67] CR2: 0000557c7e4fc0b8 CR3: 000000005313a003 CR4: 0000000000772ef0
[   32.691428][   T67] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.691724][   T67] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.692014][   T67] PKRU: 55555554
[   32.692164][   T67] Call Trace:
[   32.692304][   T67]  <TASK>
[ 32.692404][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.692580][ T67] ? __warn (kernel/panic.c:748)
[ 32.692721][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.692888][ T67] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 32.693073][ T67] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 32.693209][ T67] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 32.693371][ T67] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 32.693549][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.693717][ T67] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.693885][ T67] rfc2863_policy (net/core/link_watch.c:78)
[ 32.694073][ T67] linkwatch_do_dev (net/core/link_watch.c:180)
[ 32.694247][ T67] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 32.694419][ T67] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 32.694586][ T67] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 32.694795][ T67] default_device_exit_batch (net/core/dev.c:12051)
[ 32.694965][ T67] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 32.695186][ T67] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 32.695363][ T67] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 32.695528][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 32.695704][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 32.695867][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 32.696039][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 32.696215][ T67] ? process_one_work (kernel/workqueue.c:3205)
[ 32.696392][ T67] process_one_work (kernel/workqueue.c:3229)
[ 32.696573][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 32.696744][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 32.696922][ T67] ? assign_work (kernel/workqueue.c:1200)
[ 32.697108][ T67] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 32.697279][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 32.697486][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 32.697655][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 32.697822][ T67] kthread (kernel/kthread.c:389)
[ 32.697964][ T67] ? __pfx_kthread (kernel/kthread.c:342)
[ 32.698147][ T67] ret_from_fork (arch/x86/kernel/process.c:147)
[ 32.698317][ T67] ? __pfx_kthread (kernel/kthread.c:342)


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