[    2.337173] ip (276) used greatest stack depth: 12336 bytes left
[  325.560026] ip (6534) used greatest stack depth: 12320 bytes left
[  958.291818] blackhole_netdev_xmit(): Dropping skb.
[  958.291891] blackhole_netdev_xmit(): Dropping skb.
[  958.291924] blackhole_netdev_xmit(): Dropping skb.
[  958.291955] blackhole_netdev_xmit(): Dropping skb.