[    2.553914] ip (276) used greatest stack depth: 12344 bytes left
[   29.590449] ip (2585) used greatest stack depth: 12328 bytes left
[  654.297741] ip (21875) used greatest stack depth: 12200 bytes left
[  963.334344] blackhole_netdev_xmit(): Dropping skb.
[  963.334403] blackhole_netdev_xmit(): Dropping skb.
[  963.334434] blackhole_netdev_xmit(): Dropping skb.
[  963.334460] blackhole_netdev_xmit(): Dropping skb.
[  990.542843] blackhole_netdev_xmit(): Dropping skb.
[  990.542918] blackhole_netdev_xmit(): Dropping skb.
[  990.542958] blackhole_netdev_xmit(): Dropping skb.
[  990.542994] blackhole_netdev_xmit(): Dropping skb.