[    2.152721] ip (275) used greatest stack depth: 12320 bytes left
[  628.843890] ip (15885) used greatest stack depth: 12304 bytes left
[  887.058176] blackhole_netdev_xmit(): Dropping skb.
[  887.058235] blackhole_netdev_xmit(): Dropping skb.
[  887.058266] blackhole_netdev_xmit(): Dropping skb.
[  887.058298] blackhole_netdev_xmit(): Dropping skb.
[ 1226.437863] blackhole_netdev_xmit(): Dropping skb.
[ 1226.437931] blackhole_netdev_xmit(): Dropping skb.
[ 1226.437972] blackhole_netdev_xmit(): Dropping skb.
[ 1226.438009] blackhole_netdev_xmit(): Dropping skb.