[    2.659020] ip (276) used greatest stack depth: 12368 bytes left
[    2.870949] ip (290) used greatest stack depth: 12352 bytes left
[  902.841410] blackhole_netdev_xmit(): Dropping skb.
[  902.841492] blackhole_netdev_xmit(): Dropping skb.
[  902.841554] blackhole_netdev_xmit(): Dropping skb.
[  902.841623] blackhole_netdev_xmit(): Dropping skb.
[ 1045.405947] blackhole_netdev_xmit(): Dropping skb.
[ 1045.406021] blackhole_netdev_xmit(): Dropping skb.
[ 1045.406055] blackhole_netdev_xmit(): Dropping skb.
[ 1045.406089] blackhole_netdev_xmit(): Dropping skb.