[    2.338148] ip (241) used greatest stack depth: 12352 bytes left
[    2.821432] ip (275) used greatest stack depth: 12320 bytes left
[    5.115921] ip (411) used greatest stack depth: 12304 bytes left
[  625.484512] ip (14757) used greatest stack depth: 12048 bytes left
[  833.397286] blackhole_netdev_xmit(): Dropping skb.
[  833.397350] blackhole_netdev_xmit(): Dropping skb.
[  833.397399] blackhole_netdev_xmit(): Dropping skb.
[  833.397439] blackhole_netdev_xmit(): Dropping skb.
[  889.124219] blackhole_netdev_xmit(): Dropping skb.
[  889.124273] blackhole_netdev_xmit(): Dropping skb.
[  889.124306] blackhole_netdev_xmit(): Dropping skb.
[  889.124341] blackhole_netdev_xmit(): Dropping skb.