[    2.427636] ip (278) used greatest stack depth: 12200 bytes left
[ 1167.926688] blackhole_netdev_xmit(): Dropping skb.
[ 1167.926774] blackhole_netdev_xmit(): Dropping skb.
[ 1167.926811] blackhole_netdev_xmit(): Dropping skb.
[ 1167.926846] blackhole_netdev_xmit(): Dropping skb.