======================================
| [  236.870843][   T11] ------------[ cut here ]------------
| [  236.871188][   T11] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 236.871479][ T11] WARNING: CPU: 3 PID: 11 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [  236.871780][   T11] Modules linked in: vxlan nft_chain_nat xt_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c act_mirred cls_u32 sch_ingress ifb
[  236.872607][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  236.872822][   T11] Workqueue: netns cleanup_net
[ 236.873022][ T11] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 236.873199][ T11] 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 17 8a 48 c7 c7 40 7c 17 8a 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 17 8a 	mov    $0xffffffff8a177c00,%rsi
  1d:	48 c7 c7 40 7c 17 8a 	mov    $0xffffffff8a177c40,%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
[  236.873778][   T11] RSP: 0018:ffffc900000b7a48 EFLAGS: 00010282
[  236.873998][   T11] RAX: 0000000000000000 RBX: ffff888008db9000 RCX: 1ffffffff153dd8c
[  236.874237][   T11] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[  236.874471][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff153dd8c
[  236.874704][   T11] R10: 0000000000000003 R11: ffff888001ae2300 R12: 0000000000000000
[  236.874932][   T11] R13: dffffc0000000000 R14: ffff888017921000 R15: ffff888008db95c0
[  236.875182][   T11] FS:  0000000000000000(0000) GS:ffff88806d180000(0000) knlGS:0000000000000000
[  236.875457][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  236.875649][   T11] CR2: 00007fd9c9af4000 CR3: 000000000fd3a005 CR4: 0000000000772ef0
[  236.875880][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  236.876119][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  236.876493][   T11] PKRU: 55555554
[  236.876612][   T11] Call Trace:
[  236.876732][   T11]  <TASK>
[ 236.876817][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 236.876998][ T11] ? __warn (kernel/panic.c:748)
[ 236.877123][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 236.877278][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 236.877437][ T11] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 236.877554][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 236.877726][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 236.877898][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 236.878088][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 236.878247][ T11] rfc2863_policy (net/core/link_watch.c:78)
[ 236.878404][ T11] linkwatch_do_dev (net/core/link_watch.c:180)
[ 236.878555][ T11] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 236.878713][ T11] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 236.878870][ T11] ? vrf_dellink (drivers/net/vrf.c:1668)
[ 236.879034][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 236.879237][ T11] default_device_exit_batch (net/core/dev.c:12051)
[ 236.879391][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 236.879583][ T11] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 236.879742][ T11] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 236.879892][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 236.880061][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 236.880214][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 236.880369][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 236.880518][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 236.880676][ T11] process_one_work (kernel/workqueue.c:3229)
[ 236.880838][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 236.881004][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 236.881167][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 236.881332][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 236.881500][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 236.881652][ T11] kthread (kernel/kthread.c:389)
[ 236.881782][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 236.881941][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 236.882113][ T11] ? __pfx_kthread (kernel/kthread.c:342)


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