======================================
| [  128.688222][   T68] ------------[ cut here ]------------
| [  128.688556][   T68] RTNL: assertion failed at net/core/link_watch.c (59)
| [ 128.688799][ T68] WARNING: CPU: 3 PID: 68 at net/core/link_watch.c:59 default_operstate (net/core/link_watch.c:59 (discriminator 3))
| [  128.689080][   T68] Modules linked in: sch_netem
[  128.689553][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  128.689756][   T68] Workqueue: netns cleanup_net
[ 128.689936][ T68] RIP: 0010:default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 128.690101][ T68] Code: 83 e4 01 0f 85 03 ff ff ff c6 05 f4 4a 3f 02 01 90 ba 3b 00 00 00 48 c7 c6 c0 12 97 a6 48 c7 c7 00 13 97 a6 e8 13 06 eb fd 90 <0f> 0b 90 90 e9 d9 fe ff ff 48 89 ef e8 d1 2a 72 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 f4 4a 3f 02 01 	movb   $0x1,0x23f4af4(%rip)        # 0x23f4b04
  10:	90                   	nop
  11:	ba 3b 00 00 00       	mov    $0x3b,%edx
  16:	48 c7 c6 c0 12 97 a6 	mov    $0xffffffffa69712c0,%rsi
  1d:	48 c7 c7 00 13 97 a6 	mov    $0xffffffffa6971300,%rdi
  24:	e8 13 06 eb fd       	call   0xfffffffffdeb063c
  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 2a 72 fe       	call   0xfffffffffe722b0c
  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 2a 72 fe       	call   0xfffffffffe722ae2
  11:	e9 f7 fd ff ff       	jmp    0xfffffffffffffe0d
[  128.690679][   T68] RSP: 0018:ffffc90000497a48 EFLAGS: 00010282
[  128.690880][   T68] RAX: 0000000000000000 RBX: ffff888008339000 RCX: 1ffffffff4e3fd8c
[  128.691113][   T68] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
[  128.691380][   T68] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff4e3fd8c
[  128.691614][   T68] R10: 0000000000000003 R11: ffff888007cd2300 R12: 0000000000000000
[  128.691847][   T68] R13: dffffc0000000000 R14: ffff88800857c000 R15: ffff8880083395a0
[  128.692081][   T68] FS:  0000000000000000(0000) GS:ffff888036180000(0000) knlGS:0000000000000000
[  128.692365][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  128.692564][   T68] CR2: 00000000004060bb CR3: 000000001274a002 CR4: 0000000000772ef0
[  128.692805][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  128.693042][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  128.693487][   T68] PKRU: 55555554
[  128.693617][   T68] Call Trace:
[  128.693738][   T68]  <TASK>
[ 128.693824][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 128.693991][ T68] ? __warn (kernel/panic.c:748)
[ 128.694115][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 128.694275][ T68] ? report_bug (lib/bug.c:201 lib/bug.c:219)
[ 128.694454][ T68] ? handle_bug (arch/x86/kernel/traps.c:285)
[ 128.694580][ T68] ? exc_invalid_op (arch/x86/kernel/traps.c:309 (discriminator 1))
[ 128.694739][ T68] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621)
[ 128.694914][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 128.695073][ T68] ? default_operstate (net/core/link_watch.c:59 (discriminator 3))
[ 128.695230][ T68] rfc2863_policy (net/core/link_watch.c:78)
[ 128.695405][ T68] linkwatch_do_dev (net/core/link_watch.c:180)
[ 128.695567][ T68] netdev_run_todo (net/core/dev.c:10894 (discriminator 2))
[ 128.695731][ T68] ? __pfx_netdev_run_todo (net/core/dev.c:10867)
[ 128.695890][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11455)
[ 128.696100][ T68] default_device_exit_batch (net/core/dev.c:12051)
[ 128.696259][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12051)
[ 128.696466][ 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)
[ 128.696633][ 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)
[ 128.696840][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 128.697002][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 128.697160][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 128.697348][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 128.697515][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 128.697681][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 128.697847][ T68] process_one_work (kernel/workqueue.c:3229)
[ 128.698017][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 128.698176][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 128.698358][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 128.698524][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 128.698680][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 128.698998][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 128.699158][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 128.699328][ T68] kthread (kernel/kthread.c:389)
[ 128.699449][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 128.699684][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 128.699841][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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