[    2.046866] ip (247) used greatest stack depth: 12440 bytes left
[    2.674209] ip (281) used greatest stack depth: 12360 bytes left
[    2.718983] ip (285) used greatest stack depth: 12344 bytes left
[    2.864145] ip (295) used greatest stack depth: 12032 bytes left
[  810.042403] blackhole_netdev_xmit(): Dropping skb.
[  810.042460] blackhole_netdev_xmit(): Dropping skb.
[  810.042489] blackhole_netdev_xmit(): Dropping skb.
[  810.042523] blackhole_netdev_xmit(): Dropping skb.
[  985.760696] blackhole_netdev_xmit(): Dropping skb.
[  985.760748] blackhole_netdev_xmit(): Dropping skb.
[  985.760779] blackhole_netdev_xmit(): Dropping skb.
[  985.760812] blackhole_netdev_xmit(): Dropping skb.