[    2.245378] ip (277) used greatest stack depth: 12320 bytes left
[   21.830880] ip (2494) used greatest stack depth: 12048 bytes left
[  982.072378] blackhole_netdev_xmit(): Dropping skb.
[  982.072451] blackhole_netdev_xmit(): Dropping skb.
[  982.072484] blackhole_netdev_xmit(): Dropping skb.
[  982.072521] blackhole_netdev_xmit(): Dropping skb.
[ 1074.867668] blackhole_netdev_xmit(): Dropping skb.
[ 1074.867744] blackhole_netdev_xmit(): Dropping skb.
[ 1074.867792] blackhole_netdev_xmit(): Dropping skb.
[ 1074.867843] blackhole_netdev_xmit(): Dropping skb.