[    2.220193] ip (275) used greatest stack depth: 12320 bytes left
[ 1224.124174] blackhole_netdev_xmit(): Dropping skb.
[ 1224.124246] blackhole_netdev_xmit(): Dropping skb.
[ 1224.124283] blackhole_netdev_xmit(): Dropping skb.
[ 1224.124320] blackhole_netdev_xmit(): Dropping skb.