======================================
| [   26.437676][   T68] ------------[ cut here ]------------
| [   26.437995][   T68] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 26.438245][ T68] WARNING: CPU: 0 PID: 68 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [   26.438561][   T68] Modules linked in: xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c inet_diag ipip veth
[   26.439282][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.439514][   T68] Workqueue: netns cleanup_net
[ 26.439686][ T68] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 26.439853][ T68] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 09 a7 37 02 01 90 ba 3b 00 00 00 48 c7 c6 a0 67 37 93 48 c7 c7 e0 67 37 93 e8 c3 8b e7 fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 11 be 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 09 a7 37 02 01 	movb   $0x1,0x237a709(%rip)        # 0x237a719
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 a0 67 37 93 	mov    $0xffffffff933767a0,%rsi
  1d:	48 c7 c7 e0 67 37 93 	mov    $0xffffffff933767e0,%rdi
  24:	e8 c3 8b e7 fd       	call   0xfffffffffde78bec
  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 11 be 71 fe       	call   0xfffffffffe71be4c
  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 11 be 71 fe       	call   0xfffffffffe71be22
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[   26.440438][   T68] RSP: 0018:ffffc90000497a48 EFLAGS: 00010282
[   26.440658][   T68] RAX: 0000000000000000 RBX: ffff88800c181000 RCX: 1ffffffff277b678
[   26.440908][   T68] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[   26.441153][   T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff277b678
[   26.441407][   T68] R10: 0000000000000003 R11: ffff888008c4a300 R12: 0000000000000000
[   26.441648][   T68] R13: dffffc0000000000 R14: ffff88800c1ac000 R15: ffff88800c1815b0
[   26.441900][   T68] FS:  0000000000000000(0000) GS:ffff888036000000(0000) knlGS:0000000000000000
[   26.442210][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   26.442425][   T68] CR2: 00007f321a15f470 CR3: 000000001ed26002 CR4: 0000000000772ef0
[   26.442677][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   26.442923][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   26.443287][   T68] PKRU: 55555554
[   26.443439][   T68] Call Trace:
[   26.443567][   T68]  <TASK>
[ 26.443659][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 26.443822][ T68] ? __warn (kernel/panic.c:748)
[ 26.443954][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 26.444116][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 26.444287][ T68] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 26.444429][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 26.444595][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 26.444775][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 26.444945][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 26.445111][ T68] rfc2863_policy (net/core/link_watch.c:78)
[ 26.445281][ T68] linkwatch_do_dev (net/core/link_watch.c:180)
[ 26.445454][ T68] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 26.445622][ T68] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 26.445787][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 26.445997][ T68] default_device_exit_batch (net/core/dev.c:12051)
[ 26.446163][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 26.446359][ T68] ? 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)
[ 26.446537][ T68] ? 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)
[ 26.446742][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 26.446905][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 26.447068][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 26.447222][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 26.447400][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 26.447559][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 26.447730][ T68] process_one_work (kernel/workqueue.c:3229)
[ 26.447899][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 26.448058][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 26.448232][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 26.448408][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 26.448568][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 26.448763][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 26.448923][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 26.449083][ T68] kthread (kernel/kthread.c:389)
[ 26.449205][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 26.449389][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 26.449560][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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