[   10.122029][  T251] blackhole_netdev_xmit(): Dropping skb.
[   10.122601][  T251] dev_queue_xmit() returned NET_XMIT_SUCCESS
[   10.257876][  T253] test_blackholedev module terminating.
[   11.309155][  T189] kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)