[    2.167711] ip (277) used greatest stack depth: 12320 bytes left
[    9.497819] ip (1074) used greatest stack depth: 12248 bytes left
[   17.161892] ip (2230) used greatest stack depth: 12160 bytes left
[ 1150.369493] blackhole_netdev_xmit(): Dropping skb.
[ 1150.369667] blackhole_netdev_xmit(): Dropping skb.
[ 1150.369700] blackhole_netdev_xmit(): Dropping skb.
[ 1150.369732] blackhole_netdev_xmit(): Dropping skb.