[    2.587339] ip (278) used greatest stack depth: 12360 bytes left
[    2.638236] ip (282) used greatest stack depth: 12344 bytes left
[    8.251882] ip (650) used greatest stack depth: 12296 bytes left
[   15.264102] ip (1172) used greatest stack depth: 12200 bytes left
[  666.737964] blackhole_netdev_xmit(): Dropping skb.
[  666.738021] blackhole_netdev_xmit(): Dropping skb.
[  666.738052] blackhole_netdev_xmit(): Dropping skb.
[  666.738078] blackhole_netdev_xmit(): Dropping skb.
[  759.617784] blackhole_netdev_xmit(): Dropping skb.
[  759.617845] blackhole_netdev_xmit(): Dropping skb.
[  759.617876] blackhole_netdev_xmit(): Dropping skb.
[  759.617903] blackhole_netdev_xmit(): Dropping skb.
[  891.043877] blackhole_netdev_xmit(): Dropping skb.
[  891.043928] blackhole_netdev_xmit(): Dropping skb.
[  891.043959] blackhole_netdev_xmit(): Dropping skb.
[  891.043991] blackhole_netdev_xmit(): Dropping skb.