[   88.163802] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 16
[   88.163882] unregister_netdevice: waiting for lo to become free. Usage count = 4
[   88.163944] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 18
[   88.164010] unregister_netdevice: waiting for lo to become free. Usage count = 6