[    2.125543] ip (242) used greatest stack depth: 12376 bytes left
[    2.800927] ip (277) used greatest stack depth: 12344 bytes left
[   10.011158] ip (787) used greatest stack depth: 12304 bytes left
[  804.878958] blackhole_netdev_xmit(): Dropping skb.
[  804.879041] blackhole_netdev_xmit(): Dropping skb.
[  804.879086] blackhole_netdev_xmit(): Dropping skb.
[  804.879129] blackhole_netdev_xmit(): Dropping skb.