[    2.598123] ip (276) used greatest stack depth: 12320 bytes left
[  816.005642] blackhole_netdev_xmit(): Dropping skb.
[  816.005704] blackhole_netdev_xmit(): Dropping skb.
[  816.005735] blackhole_netdev_xmit(): Dropping skb.
[  816.005777] blackhole_netdev_xmit(): Dropping skb.
[  912.696278] blackhole_netdev_xmit(): Dropping skb.
[  912.696346] blackhole_netdev_xmit(): Dropping skb.
[  912.696385] blackhole_netdev_xmit(): Dropping skb.
[  912.696422] blackhole_netdev_xmit(): Dropping skb.
[ 1222.750712] blackhole_netdev_xmit(): Dropping skb.
[ 1222.750772] blackhole_netdev_xmit(): Dropping skb.
[ 1222.750813] blackhole_netdev_xmit(): Dropping skb.
[ 1222.750856] blackhole_netdev_xmit(): Dropping skb.