[   25.941785] ip (2368) used greatest stack depth: 12272 bytes left
[ 1106.976131] blackhole_netdev_xmit(): Dropping skb.
[ 1106.976202] blackhole_netdev_xmit(): Dropping skb.
[ 1106.976239] blackhole_netdev_xmit(): Dropping skb.
[ 1106.976279] blackhole_netdev_xmit(): Dropping skb.