[    2.210961] ip (275) used greatest stack depth: 12320 bytes left
[    6.555767] ip (651) used greatest stack depth: 12048 bytes left
[ 1125.511571] blackhole_netdev_xmit(): Dropping skb.
[ 1125.511635] blackhole_netdev_xmit(): Dropping skb.
[ 1125.511666] blackhole_netdev_xmit(): Dropping skb.
[ 1125.511699] blackhole_netdev_xmit(): Dropping skb.