[    2.801270] ip (280) used greatest stack depth: 12360 bytes left
[    2.884599] ip (284) used greatest stack depth: 12344 bytes left
[  996.003941] blackhole_netdev_xmit(): Dropping skb.
[  996.004017] blackhole_netdev_xmit(): Dropping skb.
[  996.004059] blackhole_netdev_xmit(): Dropping skb.
[  996.004097] blackhole_netdev_xmit(): Dropping skb.