[    2.473586] ip (276) used greatest stack depth: 12352 bytes left
[ 1163.585004] blackhole_netdev_xmit(): Dropping skb.
[ 1163.585075] blackhole_netdev_xmit(): Dropping skb.
[ 1163.585106] blackhole_netdev_xmit(): Dropping skb.
[ 1163.585139] blackhole_netdev_xmit(): Dropping skb.