[ 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