[    1.857422] ip (245) used greatest stack depth: 12384 bytes left
[    2.413969] ip (276) used greatest stack depth: 12296 bytes left
[  790.150843] blackhole_netdev_xmit(): Dropping skb.
[  790.150910] blackhole_netdev_xmit(): Dropping skb.
[  790.150943] blackhole_netdev_xmit(): Dropping skb.
[  790.150980] blackhole_netdev_xmit(): Dropping skb.