[    2.110513] ip (241) used greatest stack depth: 12304 bytes left
[  704.230165] blackhole_netdev_xmit(): Dropping skb.
[  704.230231] blackhole_netdev_xmit(): Dropping skb.
[  704.230286] blackhole_netdev_xmit(): Dropping skb.
[  704.230322] blackhole_netdev_xmit(): Dropping skb.