[    2.463256] ip (277) used greatest stack depth: 12368 bytes left
[    2.657936] ip (291) used greatest stack depth: 12352 bytes left
[  652.912666] ip (24856) used greatest stack depth: 12200 bytes left
[  876.224978] blackhole_netdev_xmit(): Dropping skb.
[  876.225057] blackhole_netdev_xmit(): Dropping skb.
[  876.225120] blackhole_netdev_xmit(): Dropping skb.
[  876.225165] blackhole_netdev_xmit(): Dropping skb.