======================================
| xx__-> [   73.842074][   T11] ------------[ cut here ]------------
| [   73.842405][   T11] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 73.842648][ T11] WARNING: CPU: 1 PID: 11 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   73.842946][   T11] Modules linked in: vxlan xt_conntrack nf_conntrack nf_defrag_ipv4 nft_compat nf_tables libcrc32c nf_defrag_ipv6
[   73.843750][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   73.843959][   T11] Workqueue: netns cleanup_net
[ 73.844139][ T11] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 73.844332][ 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 37 b6 48 c7 c7 40 7c 37 b6 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 37 b6 	mov    $0xffffffffb6377c00,%rsi
  1d:	48 c7 c7 40 7c 37 b6 	mov    $0xffffffffb6377c40,%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
[   73.845012][   T11] RSP: 0018:ffffc900000b7a48 EFLAGS: 00010282
[   73.845259][   T11] RAX: 0000000000000000 RBX: ffff888017841000 RCX: 1ffffffff6d7dd8c
[   73.845574][   T11] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   73.845858][   T11] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff6d7dd8c
[   73.846170][   T11] R10: 0000000000000003 R11: ffff888001ae2300 R12: 0000000000000000
[   73.846487][   T11] R13: dffffc0000000000 R14: ffff8880170ac000 R15: ffff8880178415c0
[   73.846830][   T11] FS:  0000000000000000(0000) GS:ffff88806d080000(0000) knlGS:0000000000000000
[   73.847181][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   73.847453][   T11] CR2: 00007f67e825d258 CR3: 000000000c53a005 CR4: 0000000000772ef0
[   73.847753][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   73.848040][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   73.848352][   T11] PKRU: 55555554
[   73.848499][   T11] Call Trace:
[   73.848650][   T11]  <TASK>
[ 73.848754][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 73.848970][ T11] ? __warn (kernel/panic.c:748)
[ 73.849119][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 73.849318][ T11] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 73.849521][ T11] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 73.849659][ T11] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 73.849844][ T11] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 73.850053][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 73.850241][ T11] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 73.850433][ T11] rfc2863_policy (net/core/link_watch.c:78)
[ 73.850628][ T11] linkwatch_do_dev (net/core/link_watch.c:180)
[ 73.850827][ T11] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 73.851033][ T11] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 73.851228][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 73.851504][ T11] default_device_exit_batch (net/core/dev.c:12051)
[ 73.851708][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 73.851959][ T11] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 73.852168][ T11] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 73.852379][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 73.852575][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 73.852757][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 73.852944][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 73.853146][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 73.853357][ T11] process_one_work (kernel/workqueue.c:3229)
[ 73.853557][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 73.853764][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 73.853954][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 73.854126][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 73.854393][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 73.854599][ T11] kthread (kernel/kthread.c:389)
[ 73.854747][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 73.854934][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 73.855113][ T11] ? __pfx_kthread (kernel/kthread.c:342)


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