[  231.149800] ip (7329) used greatest stack depth: 12304 bytes left
[ 1210.438344] blackhole_netdev_xmit(): Dropping skb.
[ 1210.438423] blackhole_netdev_xmit(): Dropping skb.
[ 1210.438455] blackhole_netdev_xmit(): Dropping skb.
[ 1210.438487] blackhole_netdev_xmit(): Dropping skb.