[    2.630346] ip (272) used greatest stack depth: 12344 bytes left
[  916.094070] blackhole_netdev_xmit(): Dropping skb.
[  916.094161] blackhole_netdev_xmit(): Dropping skb.
[  916.094205] blackhole_netdev_xmit(): Dropping skb.
[  916.094251] blackhole_netdev_xmit(): Dropping skb.