[    2.055062] ip (241) used greatest stack depth: 12832 bytes left
[    2.094531] ip (244) used greatest stack depth: 12352 bytes left
[    2.677489] ip (276) used greatest stack depth: 12320 bytes left
[ 1117.921965] blackhole_netdev_xmit(): Dropping skb.
[ 1117.922043] blackhole_netdev_xmit(): Dropping skb.
[ 1117.922086] blackhole_netdev_xmit(): Dropping skb.
[ 1117.922148] blackhole_netdev_xmit(): Dropping skb.