[    2.304670] ip (273) used greatest stack depth: 12344 bytes left
[    2.467485] ip (288) used greatest stack depth: 12184 bytes left
[  756.343971] blackhole_netdev_xmit(): Dropping skb.
[  756.344049] blackhole_netdev_xmit(): Dropping skb.
[  756.344093] blackhole_netdev_xmit(): Dropping skb.
[  756.344141] blackhole_netdev_xmit(): Dropping skb.
[  760.564653] blackhole_netdev_xmit(): Dropping skb.
[  760.564716] blackhole_netdev_xmit(): Dropping skb.
[  760.564760] blackhole_netdev_xmit(): Dropping skb.
[  760.564834] blackhole_netdev_xmit(): Dropping skb.