[    1.874075] ip (247) used greatest stack depth: 12304 bytes left
[   10.092103] ip (1086) used greatest stack depth: 12048 bytes left
[  794.469892] blackhole_netdev_xmit(): Dropping skb.
[  794.469955] blackhole_netdev_xmit(): Dropping skb.
[  794.469988] blackhole_netdev_xmit(): Dropping skb.
[  794.470020] blackhole_netdev_xmit(): Dropping skb.