[    2.678203] ip (275) used greatest stack depth: 12320 bytes left
[  871.915876] blackhole_netdev_xmit(): Dropping skb.
[  871.915947] blackhole_netdev_xmit(): Dropping skb.
[  871.915981] blackhole_netdev_xmit(): Dropping skb.
[  871.916016] blackhole_netdev_xmit(): Dropping skb.