[  230.212724] ip (6136) used greatest stack depth: 12160 bytes left
[  933.147223] blackhole_netdev_xmit(): Dropping skb.
[  933.147292] blackhole_netdev_xmit(): Dropping skb.
[  933.147322] blackhole_netdev_xmit(): Dropping skb.
[  933.147353] blackhole_netdev_xmit(): Dropping skb.