======================================
| [   18.141397] br0: port 1(vxlan0) entered disabled state
| [   18.141605] ------------[ cut here ]------------
| [   18.141647] WARNING: CPU: 0 PID: 65 at net/core/rtnetlink.c:135 __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
| [   18.141706] Modules linked in: vxlan
[   18.141793] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.141837] Workqueue: netns cleanup_net
[   18.141869] RIP: 0010:__rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[ 18.141907] Code: 28 00 48 85 db 74 1c 48 89 de 31 ff 48 8b 1b ba 02 00 00 00 e8 62 22 fc ff e8 3d 9a 28 00 48 85 db 75 e4 5b c3 cc cc cc cc 90 <0f> 0b 90 eb c7 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90
All code
========
   0:	28 00                	sub    %al,(%rax)
   2:	48 85 db             	test   %rbx,%rbx
   5:	74 1c                	je     0x23
   7:	48 89 de             	mov    %rbx,%rsi
   a:	31 ff                	xor    %edi,%edi
   c:	48 8b 1b             	mov    (%rbx),%rbx
   f:	ba 02 00 00 00       	mov    $0x2,%edx
  14:	e8 62 22 fc ff       	call   0xfffffffffffc227b
  19:	e8 3d 9a 28 00       	call   0x289a5b
  1e:	48 85 db             	test   %rbx,%rbx
  21:	75 e4                	jne    0x7
  23:	5b                   	pop    %rbx
  24:	c3                   	ret
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	eb c7                	jmp    0xfffffffffffffff6
  2f:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 00 
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	eb c7                	jmp    0xffffffffffffffcc
   5:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 00 
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   18.142027] RSP: 0018:ffffb45640247d00 EFLAGS: 00010283
[   18.142067] RAX: ffff8b4284b58508 RBX: 0000000000000000 RCX: ffff8b4281967560
[   18.142125] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff8b4284b51000
[   18.142175] RBP: ffffb45640247c48 R08: ffff8b42863fe198 R09: ffff8b4281194a10
[   18.142225] R10: ffffb45640247c30 R11: ffffb45640247c38 R12: dead000000000122
[   18.142275] R13: dead000000000100 R14: ffff8b4283341b00 R15: 0000000000000000
[   18.142327] FS:  0000000000000000(0000) GS:ffff8b42bec00000(0000) knlGS:0000000000000000
[   18.142382] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   18.142428] CR2: 00007f217a07a000 CR3: 000000003c446005 CR4: 0000000000772ef0
[   18.142480] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   18.142536] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   18.142586] PKRU: 55555554
[   18.142603] Call Trace:
[   18.142621]  <TASK>
[   18.142643] ? __warn (kernel/panic.c:748)
[   18.142674] ? __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[   18.142704] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[   18.142736] ? handle_bug (arch/x86/kernel/traps.c:285)
[   18.142766] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[   18.142791] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[   18.142816] ? __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[   18.142841] unregister_netdevice_many_notify (./include/linux/kernel.h:73 net/core/dev.c:11470 net/core/dev.c:11639)
[   18.142882] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[   18.142913] ? unregister_netdevice_queue (net/core/dev.c:11521)
[   18.142953] default_device_exit_batch (net/core/dev.c:12147)
[   18.142993] cleanup_net (net/core/net_namespace.c:651 (discriminator 3))
[   18.143030] process_one_work (kernel/workqueue.c:3229)
[   18.143062] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[   18.143086] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[   18.143123] kthread (kernel/kthread.c:389)
[   18.143150] ? __pfx_kthread (kernel/kthread.c:342)
[   18.143176] ret_from_fork (arch/x86/kernel/process.c:147)
[   18.143207] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
__rtnl_unlock:unregister_netdevice_many_notify:default_device_exit_batch:cleanup_net:process_one_work