[    2.532932] ip (274) used greatest stack depth: 12344 bytes left
[    8.536800] ip (749) used greatest stack depth: 12328 bytes left
[  679.449631] blackhole_netdev_xmit(): Dropping skb.
[  679.449691] blackhole_netdev_xmit(): Dropping skb.
[  679.449721] blackhole_netdev_xmit(): Dropping skb.
[  679.449752] blackhole_netdev_xmit(): Dropping skb.
[  775.549997] blackhole_netdev_xmit(): Dropping skb.
[  775.550077] blackhole_netdev_xmit(): Dropping skb.
[  775.550121] blackhole_netdev_xmit(): Dropping skb.
[  775.550164] blackhole_netdev_xmit(): Dropping skb.