[    2.312244] ip (275) used greatest stack depth: 12320 bytes left
[   19.260422] ip (2229) used greatest stack depth: 12088 bytes left
[ 1165.260240] blackhole_netdev_xmit(): Dropping skb.
[ 1165.260308] blackhole_netdev_xmit(): Dropping skb.
[ 1165.260348] blackhole_netdev_xmit(): Dropping skb.
[ 1165.260378] blackhole_netdev_xmit(): Dropping skb.