[   47.082550] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 18
[   47.082737] unregister_netdevice: waiting for lo to become free. Usage count = 6
[   47.082782] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 16
[   47.082829] unregister_netdevice: waiting for lo to become free. Usage count = 4