[    2.015240] ip (244) used greatest stack depth: 12320 bytes left
[    9.606633] ip (785) used greatest stack depth: 12288 bytes left
[ 1017.969589] blackhole_netdev_xmit(): Dropping skb.
[ 1017.969662] blackhole_netdev_xmit(): Dropping skb.
[ 1017.969695] blackhole_netdev_xmit(): Dropping skb.
[ 1017.969725] blackhole_netdev_xmit(): Dropping skb.
[ 1226.642300] blackhole_netdev_xmit(): Dropping skb.
[ 1226.642358] blackhole_netdev_xmit(): Dropping skb.
[ 1226.642394] blackhole_netdev_xmit(): Dropping skb.
[ 1226.642438] blackhole_netdev_xmit(): Dropping skb.