[    2.586360] ip (280) used greatest stack depth: 12344 bytes left
[   10.892422] ip (963) used greatest stack depth: 12192 bytes left
[  705.112964] blackhole_netdev_xmit(): Dropping skb.
[  705.113021] blackhole_netdev_xmit(): Dropping skb.
[  705.113053] blackhole_netdev_xmit(): Dropping skb.
[  705.113086] blackhole_netdev_xmit(): Dropping skb.