[    2.531071] ip (277) used greatest stack depth: 12344 bytes left
[  718.023882] blackhole_netdev_xmit(): Dropping skb.
[  718.023942] blackhole_netdev_xmit(): Dropping skb.
[  718.023989] blackhole_netdev_xmit(): Dropping skb.
[  718.024041] blackhole_netdev_xmit(): Dropping skb.