[    2.787481] ip (275) used greatest stack depth: 12336 bytes left
[  963.091629] blackhole_netdev_xmit(): Dropping skb.
[  963.091698] blackhole_netdev_xmit(): Dropping skb.
[  963.091731] blackhole_netdev_xmit(): Dropping skb.
[  963.091766] blackhole_netdev_xmit(): Dropping skb.