[    1.858714] ip (243) used greatest stack depth: 12384 bytes left
[    2.446143] ip (277) used greatest stack depth: 12368 bytes left
[    2.634467] ip (291) used greatest stack depth: 12352 bytes left
[    8.933767] ip (754) used greatest stack depth: 12336 bytes left
[ 1006.240155] blackhole_netdev_xmit(): Dropping skb.
[ 1006.240224] blackhole_netdev_xmit(): Dropping skb.
[ 1006.240261] blackhole_netdev_xmit(): Dropping skb.
[ 1006.240305] blackhole_netdev_xmit(): Dropping skb.