[    2.310189] ip (275) used greatest stack depth: 12320 bytes left
[  788.654346] blackhole_netdev_xmit(): Dropping skb.
[  788.654409] blackhole_netdev_xmit(): Dropping skb.
[  788.654440] blackhole_netdev_xmit(): Dropping skb.
[  788.654469] blackhole_netdev_xmit(): Dropping skb.