======================================
| [   62.971670] bond0 (unregistering): Released all slaves
| [   62.971897] ------------[ cut here ]------------
| [   62.971938] WARNING: CPU: 1 PID: 11 at net/core/rtnetlink.c:135 __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
| [   62.972003] Modules linked in: bonding act_gact vxlan ip6t_rpfilter xfrm_user l2tp_ip6 l2tp_eth l2tp_ip l2tp_netlink l2tp_core sch_etf sch_fq act_tunnel_key bareudp mpls_gso mpls_iptunnel mpls_router act_mirred xt_length nft_compat nf_tables act_ct nf_flow_table nf_nat nf_conntrack libcrc32c nf_defrag_ipv6 nf_defrag_ipv4 cls_flower sch_ingress
[   62.972268] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   62.972311] Workqueue: netns cleanup_net
[   62.972345] RIP: 0010:__rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[ 62.972385] 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
[   62.972505] RSP: 0018:ffffaa2c4005fd78 EFLAGS: 00010283
[   62.972545] RAX: ffff8f3444fc8508 RBX: 0000000000000000 RCX: ffff8f34411f9540
[   62.972601] RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff8f344bdd0000
[   62.972653] RBP: ffffaa2c4005fcc0 R08: ffff8f34429deb28 R09: ffff8f3441194a10
[   62.972704] R10: ffffaa2c4005fca8 R11: ffffaa2c4005fcb0 R12: dead000000000122
[   62.972755] R13: dead000000000100 R14: ffff8f34433cfb00 R15: 0000000000000000
[   62.972807] FS:  0000000000000000(0000) GS:ffff8f347ec80000(0000) knlGS:0000000000000000
[   62.972865] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   62.972912] CR2: 00007fe00d87ea00 CR3: 00000000012ea001 CR4: 0000000000772ef0
[   62.972964] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   62.973026] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   62.973082] PKRU: 55555554
[   62.973099] Call Trace:
[   62.973118]  <TASK>
[   62.973140] ? __warn (kernel/panic.c:748)
[   62.973172] ? __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[   62.973198] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[   62.973231] ? handle_bug (arch/x86/kernel/traps.c:285)
[   62.973262] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[   62.973287] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[   62.973314] ? __rtnl_unlock (net/core/rtnetlink.c:135 (discriminator 1))
[   62.973339] unregister_netdevice_many_notify (./include/linux/kernel.h:73 net/core/dev.c:11470 net/core/dev.c:11639)
[   62.973380] ? __unregister_nexthop_notifier (net/ipv4/nexthop.c:3899)
[   62.973421] cleanup_net (net/core/net_namespace.c:648)
[   62.973447] process_one_work (kernel/workqueue.c:3229)
[   62.973479] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[   62.973510] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[   62.973544] kthread (kernel/kthread.c:389)
[   62.973576] ? __pfx_kthread (kernel/kthread.c:342)
[   62.973602] ret_from_fork (arch/x86/kernel/process.c:147)
[   62.973633] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
__rtnl_unlock:unregister_netdevice_many_notify:cleanup_net:process_one_work:worker_thread