[    2.525773] ip (276) used greatest stack depth: 12368 bytes left
[    2.573473] ip (280) used greatest stack depth: 12352 bytes left
[   27.328333] ip (2465) used greatest stack depth: 12336 bytes left
[ 1242.699048] blackhole_netdev_xmit(): Dropping skb.
[ 1242.699120] blackhole_netdev_xmit(): Dropping skb.
[ 1242.699163] blackhole_netdev_xmit(): Dropping skb.
[ 1242.699206] blackhole_netdev_xmit(): Dropping skb.