======================================
| [   32.779135][   T65] ------------[ cut here ]------------
| [   32.779462][   T65] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 32.779719][ T65] WARNING: CPU: 3 PID: 65 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   32.780023][   T65] Modules linked in: vxlan
[   32.780510][   T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.780838][   T65] Workqueue: netns cleanup_net
[ 32.781019][ T65] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.781196][ T65] 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 b7 84 48 c7 c7 40 7c b7 84 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 b7 84 	mov    $0xffffffff84b77c00,%rsi
  1d:	48 c7 c7 40 7c b7 84 	mov    $0xffffffff84b77c40,%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
[   32.781802][   T65] RSP: 0018:ffffc90000467a48 EFLAGS: 00010282
[   32.782016][   T65] RAX: 0000000000000000 RBX: ffff888008d19000 RCX: 1ffffffff0a7dd8c
[   32.782271][   T65] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   32.782533][   T65] RBP: 000000000000000e R08: 0000000000000000 R09: fffffbfff0a7dd8c
[   32.782786][   T65] R10: 0000000000000003 R11: ffff88800553a300 R12: 0000000000000000
[   32.783040][   T65] R13: dffffc0000000000 R14: ffff888005cf1000 R15: ffff888008d195c0
[   32.783291][   T65] FS:  0000000000000000(0000) GS:ffff88806d180000(0000) knlGS:0000000000000000
[   32.783602][   T65] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.783815][   T65] CR2: 00007fff54acbfe8 CR3: 00000000116c4004 CR4: 0000000000772ef0
[   32.784072][   T65] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.784329][   T65] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.784576][   T65] PKRU: 55555554
[   32.784705][   T65] Call Trace:
[   32.784833][   T65]  <TASK>
[ 32.784924][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.785096][ T65] ? __warn (kernel/panic.c:748)
[ 32.785229][ T65] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141)
[ 32.785415][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.785585][ T65] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 32.785756][ T65] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 32.785888][ T65] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 32.786052][ T65] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 32.786231][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.786409][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 32.786578][ T65] rfc2863_policy (net/core/link_watch.c:78)
[ 32.786753][ T65] linkwatch_do_dev (net/core/link_watch.c:180)
[ 32.786919][ T65] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 32.787091][ T65] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 32.787256][ T65] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 32.787480][ T65] default_device_exit_batch (net/core/dev.c:12051)
[ 32.787647][ T65] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 32.787861][ T65] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 32.788048][ T65] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 32.788215][ T65] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 32.788478][ T65] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 32.788650][ T65] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 32.788826][ T65] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 32.788997][ T65] ? process_one_work (kernel/workqueue.c:3205)
[ 32.789183][ T65] process_one_work (kernel/workqueue.c:3229)
[ 32.789371][ T65] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 32.789550][ T65] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 32.789727][ T65] ? assign_work (kernel/workqueue.c:1200)
[ 32.789905][ T65] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 32.790073][ T65] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 32.790287][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 32.790465][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 32.790637][ T65] kthread (kernel/kthread.c:389)
[ 32.790765][ T65] ? __pfx_kthread (kernel/kthread.c:342)
[ 32.790938][ T65] ret_from_fork (arch/x86/kernel/process.c:147)
[ 32.791110][ T65] ? __pfx_kthread (kernel/kthread.c:342)


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