[    2.791242] ip (278) used greatest stack depth: 12352 bytes left
[  954.033502] ip (25371) used greatest stack depth: 12200 bytes left
[ 1096.395611] blackhole_netdev_xmit(): Dropping skb.
[ 1096.395671] blackhole_netdev_xmit(): Dropping skb.
[ 1096.395703] blackhole_netdev_xmit(): Dropping skb.
[ 1096.395732] blackhole_netdev_xmit(): Dropping skb.