[    2.389601] ip (275) used greatest stack depth: 12320 bytes left
[ 1216.282112] blackhole_netdev_xmit(): Dropping skb.
[ 1216.282195] blackhole_netdev_xmit(): Dropping skb.
[ 1216.282237] blackhole_netdev_xmit(): Dropping skb.
[ 1216.282282] blackhole_netdev_xmit(): Dropping skb.