[    2.419813] ip (276) used greatest stack depth: 12352 bytes left
[  762.506111] blackhole_netdev_xmit(): Dropping skb.
[  762.506180] blackhole_netdev_xmit(): Dropping skb.
[  762.506212] blackhole_netdev_xmit(): Dropping skb.
[  762.506244] blackhole_netdev_xmit(): Dropping skb.