[    2.304443] ip (276) used greatest stack depth: 12224 bytes left
[    6.906023] ip (648) used greatest stack depth: 12032 bytes left
[  641.786012] blackhole_netdev_xmit(): Dropping skb.
[  641.786102] blackhole_netdev_xmit(): Dropping skb.
[  641.786154] blackhole_netdev_xmit(): Dropping skb.
[  641.786207] blackhole_netdev_xmit(): Dropping skb.
[  910.177735] blackhole_netdev_xmit(): Dropping skb.
[  910.177808] blackhole_netdev_xmit(): Dropping skb.
[  910.177863] blackhole_netdev_xmit(): Dropping skb.
[  910.177912] blackhole_netdev_xmit(): Dropping skb.