[    2.448524] ip (275) used greatest stack depth: 12320 bytes left
[  825.443426] blackhole_netdev_xmit(): Dropping skb.
[  825.443491] blackhole_netdev_xmit(): Dropping skb.
[  825.443521] blackhole_netdev_xmit(): Dropping skb.
[  825.443555] blackhole_netdev_xmit(): Dropping skb.
[  996.823479] blackhole_netdev_xmit(): Dropping skb.
[  996.823540] blackhole_netdev_xmit(): Dropping skb.
[  996.823570] blackhole_netdev_xmit(): Dropping skb.
[  996.823603] blackhole_netdev_xmit(): Dropping skb.