[ 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)