======================================
| [ 1284.083029] br0: port 1(vxlan0) entered disabled state
| [ 1284.115686] ------------[ cut here ]------------
| [ 1284.116700] WARNING: CPU: 2 PID: 11 at net/core/dev.c:11120 unregister_netdevice_many_notify (net/core/dev.c:11120 (discriminator 1)) 
| [ 1284.118131] Modules linked in: xt_HL amt act_mirred cls_matchall ip6_gre gre sch_ingress nft_compat nf_tables libcrc32c vxlan ip6_udp_tunnel udp_tunnel mpls_iptunnel mpls_router [last unloaded: test_bpf]
[ 1284.120325] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1284.121214] Workqueue: netns cleanup_net
[ 1284.121534] RIP: 0010:unregister_netdevice_many_notify (net/core/dev.c:11120 (discriminator 1)) 
[ 1284.121998] Code: 05 a1 4a 09 01 01 90 ba 32 1b 00 00 48 c7 c6 20 e9 ee a3 48 c7 c7 00 37 f2 a3 e8 7f 9d 55 ff 90 0f 0b 90 90 e9 15 fc ff ff 90 <0f> 0b 90 e9 23 fc ff ff e8 67 28 2e 00 0f 1f 80 00 00 00 00 90 90
All code
========
   0:	05 a1 4a 09 01       	add    $0x1094aa1,%eax
   5:	01 90 ba 32 1b 00    	add    %edx,0x1b32ba(%rax)
   b:	00 48 c7             	add    %cl,-0x39(%rax)
   e:	c6                   	(bad)
   f:	20 e9                	and    %ch,%cl
  11:	ee                   	out    %al,(%dx)
  12:	a3 48 c7 c7 00 37 f2 	movabs %eax,0xe8a3f23700c7c748
  19:	a3 e8 
  1b:	7f 9d                	jg     0xffffffffffffffba
  1d:	55                   	push   %rbp
  1e:	ff 90 0f 0b 90 90    	call   *-0x6f6ff4f1(%rax)
  24:	e9 15 fc ff ff       	jmp    0xfffffffffffffc3e
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	e9 23 fc ff ff       	jmp    0xfffffffffffffc55
  32:	e8 67 28 2e 00       	call   0x2e289e
  37:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	e9 23 fc ff ff       	jmp    0xfffffffffffffc2b
   8:	e8 67 28 2e 00       	call   0x2e2874
   d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  14:	90                   	nop
  15:	90                   	nop
[ 1284.123933] RSP: 0018:ffffaf1180063d78 EFLAGS: 00010287
[ 1284.124523] RAX: ffff909b468901c0 RBX: ffffaf1180063e08 RCX: 0000000000000000
[ 1284.125505] RDX: ffff909b460979d8 RSI: 0000000000000000 RDI: ffffffffa444aa80
[ 1284.126524] RBP: ffff909b46890000 R08: 0000000000000001 R09: 0000000000000001
[ 1284.127600] R10: 0000000000000004 R11: 0000000000000001 R12: ffff909b42cda800
[ 1284.128636] R13: ffff909b46097640 R14: dead000000000100 R15: ffff909b46097640
[ 1284.129752] FS:  0000000000000000(0000) GS:ffff909b7ed00000(0000) knlGS:0000000000000000
[ 1284.130945] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1284.131786] CR2: 00007ffea8481d58 CR3: 0000000010660001 CR4: 0000000000770ef0
[ 1284.132864] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1284.134001] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1284.135129] PKRU: 55555554
[ 1284.135463] Call Trace:
[ 1284.135843]  <TASK>
[ 1284.136147] ? __warn (kernel/panic.c:677) 
[ 1284.136676] ? unregister_netdevice_many_notify (net/core/dev.c:11120 (discriminator 1)) 
[ 1284.137390] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 1284.137841] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 1284.138335] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 1284.138807] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 1284.139431] ? unregister_netdevice_many_notify (net/core/dev.c:11120 (discriminator 1)) 
[ 1284.140235] ? unregister_netdevice_many_notify (net/core/dev.c:6962 net/core/dev.c:11120) 
[ 1284.140684] cleanup_net (net/core/net_namespace.c:633) 
[ 1284.141014] ? process_one_work (kernel/workqueue.c:2606) 
[ 1284.141493] process_one_work (kernel/workqueue.c:2633) 
[ 1284.141902] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1284.142385] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1284.142723] kthread (kernel/kthread.c:388) 
[ 1284.142984] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1284.143346] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1284.143873] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
unregister_netdevice_many_notify:cleanup_net:process_one_work:worker_thread