[   10.037859][  T251] blackhole_netdev_xmit(): Dropping skb.
[   10.038265][  T251] dev_queue_xmit() returned NET_XMIT_SUCCESS
[   10.168243][  T252] test_blackholedev module terminating.
[   11.227244][  T189] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)