[    2.271748] ip (275) used greatest stack depth: 12320 bytes left
[   10.329281] ip (1142) used greatest stack depth: 12304 bytes left
[ 1185.340013] blackhole_netdev_xmit(): Dropping skb.
[ 1185.340076] blackhole_netdev_xmit(): Dropping skb.
[ 1185.340119] blackhole_netdev_xmit(): Dropping skb.
[ 1185.340152] blackhole_netdev_xmit(): Dropping skb.