[    1.873390] ip (241) used greatest stack depth: 12432 bytes left
[    2.555654] ip (275) used greatest stack depth: 12336 bytes left
[   12.079717] ip (1046) used greatest stack depth: 12320 bytes left
[   23.625278] ip (2372) used greatest stack depth: 12176 bytes left
[  889.679131] blackhole_netdev_xmit(): Dropping skb.
[  889.679207] blackhole_netdev_xmit(): Dropping skb.
[  889.679249] blackhole_netdev_xmit(): Dropping skb.
[  889.679292] blackhole_netdev_xmit(): Dropping skb.
[  946.118463] blackhole_netdev_xmit(): Dropping skb.
[  946.118529] blackhole_netdev_xmit(): Dropping skb.
[  946.118566] blackhole_netdev_xmit(): Dropping skb.
[  946.118608] blackhole_netdev_xmit(): Dropping skb.