[    2.219579] ip (276) used greatest stack depth: 12336 bytes left
[    7.026150] ip (753) used greatest stack depth: 12320 bytes left
[  789.369696] blackhole_netdev_xmit(): Dropping skb.
[  789.369757] blackhole_netdev_xmit(): Dropping skb.
[  789.369787] blackhole_netdev_xmit(): Dropping skb.
[  789.369817] blackhole_netdev_xmit(): Dropping skb.
[  917.774248] blackhole_netdev_xmit(): Dropping skb.
[  917.774313] blackhole_netdev_xmit(): Dropping skb.
[  917.774351] blackhole_netdev_xmit(): Dropping skb.
[  917.774388] blackhole_netdev_xmit(): Dropping skb.