[    3.352940] ip (277) used greatest stack depth: 12352 bytes left
[   22.137497] ip (2188) used greatest stack depth: 12336 bytes left
[  741.089440] blackhole_netdev_xmit(): Dropping skb.
[  741.089540] blackhole_netdev_xmit(): Dropping skb.
[  741.089589] blackhole_netdev_xmit(): Dropping skb.
[  741.089640] blackhole_netdev_xmit(): Dropping skb.
[ 1040.071912] blackhole_netdev_xmit(): Dropping skb.
[ 1040.071967] blackhole_netdev_xmit(): Dropping skb.
[ 1040.072001] blackhole_netdev_xmit(): Dropping skb.
[ 1040.072047] blackhole_netdev_xmit(): Dropping skb.