[    2.473662] ip (276) used greatest stack depth: 12352 bytes left
[ 1024.936677] blackhole_netdev_xmit(): Dropping skb.
[ 1024.936747] blackhole_netdev_xmit(): Dropping skb.
[ 1024.936790] blackhole_netdev_xmit(): Dropping skb.
[ 1024.936837] blackhole_netdev_xmit(): Dropping skb.