======================================
| [   43.924644][   T65] ------------[ cut here ]------------
| [   43.924967][   T65] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 43.925219][ T65] WARNING: CPU: 3 PID: 65 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   43.925581][   T65] Modules linked in: macvlan 8021q vxlan ip6_udp_tunnel udp_tunnel bridge stp llc vrf veth
[   43.926226][   T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   43.926428][   T65] Workqueue: netns cleanup_net
[ 43.926618][ T65] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 43.926793][ T65] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 2e 39 3a 02 01 90 ba 3b 00 00 00 48 c7 c6 00 2b f7 b9 48 c7 c7 40 2b f7 b9 e8 13 95 ea fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 d1 bb 71 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 2e 39 3a 02 01 	movb   $0x1,0x23a392e(%rip)        # 0x23a393e
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 00 2b f7 b9 	mov    $0xffffffffb9f72b00,%rsi
  1d:	48 c7 c7 40 2b f7 b9 	mov    $0xffffffffb9f72b40,%rdi
  24:	e8 13 95 ea fd       	call   0xfffffffffdea953c
  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 d1 bb 71 fe       	call   0xfffffffffe71bc0c
  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 d1 bb 71 fe       	call   0xfffffffffe71bbe2
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[   43.927389][   T65] RSP: 0018:ffffc90000467ae8 EFLAGS: 00010286
[   43.928041][   T65] RAX: 0000000000000000 RBX: ffff8880051f1000 RCX: 1ffffffff74fb58c
[   43.928295][   T65] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   43.928553][   T65] RBP: 000000000000000e R08: 0000000000000000 R09: fffffbfff74fb58c
[   43.928812][   T65] R10: 0000000000000003 R11: ffff888008e8a300 R12: 0000000000000000
[   43.929065][   T65] R13: dffffc0000000000 R14: ffff88800f359000 R15: ffff8880051f15b0
[   43.929323][   T65] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[   43.929616][   T65] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   43.929848][   T65] CR2: 00007f100728d518 CR3: 000000001b526004 CR4: 0000000000772ef0
[   43.930100][   T65] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   43.930337][   T65] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   43.930585][   T65] PKRU: 55555554
[   43.930705][   T65] Call Trace:
[   43.930826][   T65]  <TASK>
[ 43.930908][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 43.931067][ T65] ? __warn (kernel/panic.c:748)
[ 43.931186][ 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)
[ 43.931352][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 43.931527][ T65] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 43.931694][ T65] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 43.931812][ T65] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 43.931973][ T65] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 43.932147][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 43.932300][ T65] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 43.932459][ T65] rfc2863_policy (net/core/link_watch.c:78)
[ 43.932629][ T65] linkwatch_do_dev (net/core/link_watch.c:180)
[ 43.932967][ T65] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 43.933126][ T65] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 43.933302][ T65] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66)
[ 43.933468][ T65] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:585 net/ipv4/nexthop.c:2158 net/ipv4/nexthop.c:2666 net/ipv4/nexthop.c:4010)
[ 43.933684][ T65] cleanup_net (net/core/net_namespace.c:647)
[ 43.933847][ T65] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 43.934004][ T65] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 43.934163][ T65] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 43.934328][ T65] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 43.934491][ T65] ? process_one_work (kernel/workqueue.c:3205)
[ 43.934655][ T65] process_one_work (kernel/workqueue.c:3229)
[ 43.934851][ T65] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 43.935015][ T65] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 43.935195][ T65] ? assign_work (kernel/workqueue.c:1200)
[ 43.935370][ T65] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 43.935573][ T65] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 43.935792][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 43.935974][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 43.936146][ T65] kthread (kernel/kthread.c:389)
[ 43.936275][ T65] ? __pfx_kthread (kernel/kthread.c:342)
[ 43.936453][ T65] ret_from_fork (arch/x86/kernel/process.c:147)
[ 43.936628][ T65] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
default_operstate:rfc2863_policy:linkwatch_do_dev:netdev_run_todo:cleanup_net