[    2.386875] ip (277) used greatest stack depth: 12320 bytes left
[ 1024.976906] blackhole_netdev_xmit(): Dropping skb.
[ 1024.976978] blackhole_netdev_xmit(): Dropping skb.
[ 1024.977014] blackhole_netdev_xmit(): Dropping skb.
[ 1024.977048] blackhole_netdev_xmit(): Dropping skb.