[    9.812536][  T252] blackhole_netdev_xmit(): Dropping skb.
[    9.812869][  T252] dev_queue_xmit() returned NET_XMIT_SUCCESS
[    9.941698][  T255] test_blackholedev module terminating.
[   10.981174][  T190] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)