[    2.547743] ip (277) used greatest stack depth: 12320 bytes left
[  842.662790] blackhole_netdev_xmit(): Dropping skb.
[  842.662939] blackhole_netdev_xmit(): Dropping skb.
[  842.662984] blackhole_netdev_xmit(): Dropping skb.
[  842.663029] blackhole_netdev_xmit(): Dropping skb.