[    9.898147][  T252] blackhole_netdev_xmit(): Dropping skb.
[    9.898554][  T252] dev_queue_xmit() returned NET_XMIT_SUCCESS
[   10.031303][  T254] test_blackholedev module terminating.
[   11.097768][  T190] kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)