[    1.772939] ip (243) used greatest stack depth: 12416 bytes left
[    1.849710] ip (249) used greatest stack depth: 12304 bytes left
[    9.486958] ip (784) used greatest stack depth: 12272 bytes left
[  654.794286] blackhole_netdev_xmit(): Dropping skb.
[  654.794359] blackhole_netdev_xmit(): Dropping skb.
[  654.794406] blackhole_netdev_xmit(): Dropping skb.
[  654.794446] blackhole_netdev_xmit(): Dropping skb.
[  924.590461] blackhole_netdev_xmit(): Dropping skb.
[  924.590521] blackhole_netdev_xmit(): Dropping skb.
[  924.590552] blackhole_netdev_xmit(): Dropping skb.
[  924.590583] blackhole_netdev_xmit(): Dropping skb.
[  937.841008] blackhole_netdev_xmit(): Dropping skb.
[  937.841081] blackhole_netdev_xmit(): Dropping skb.
[  937.841126] blackhole_netdev_xmit(): Dropping skb.
[  937.841171] blackhole_netdev_xmit(): Dropping skb.