[    2.342508] ip (274) used greatest stack depth: 12344 bytes left
[    7.578501] ip (751) used greatest stack depth: 12328 bytes left
[  824.241841] blackhole_netdev_xmit(): Dropping skb.
[  824.241921] blackhole_netdev_xmit(): Dropping skb.
[  824.241967] blackhole_netdev_xmit(): Dropping skb.
[  824.242014] blackhole_netdev_xmit(): Dropping skb.
[  857.962500] blackhole_netdev_xmit(): Dropping skb.
[  857.962563] blackhole_netdev_xmit(): Dropping skb.
[  857.962606] blackhole_netdev_xmit(): Dropping skb.
[  857.962648] blackhole_netdev_xmit(): Dropping skb.