[    2.669236] ip (277) used greatest stack depth: 12336 bytes left
[    6.603915] ip (455) used greatest stack depth: 12288 bytes left
[  699.810224] blackhole_netdev_xmit(): Dropping skb.
[  699.810330] blackhole_netdev_xmit(): Dropping skb.
[  699.810383] blackhole_netdev_xmit(): Dropping skb.
[  699.810429] blackhole_netdev_xmit(): Dropping skb.
[  792.194281] blackhole_netdev_xmit(): Dropping skb.
[  792.194344] blackhole_netdev_xmit(): Dropping skb.
[  792.194383] blackhole_netdev_xmit(): Dropping skb.
[  792.194426] blackhole_netdev_xmit(): Dropping skb.
[  817.982216] blackhole_netdev_xmit(): Dropping skb.
[  817.982299] blackhole_netdev_xmit(): Dropping skb.
[  817.982357] blackhole_netdev_xmit(): Dropping skb.
[  817.982417] blackhole_netdev_xmit(): Dropping skb.