[    1.840494] ip (239) used greatest stack depth: 12616 bytes left
[    1.906346] ip (245) used greatest stack depth: 12376 bytes left
[    2.444350] ip (273) used greatest stack depth: 12344 bytes left
[  631.877914] ip (4307) used greatest stack depth: 12296 bytes left
[  816.775911] blackhole_netdev_xmit(): Dropping skb.
[  816.775975] blackhole_netdev_xmit(): Dropping skb.
[  816.776021] blackhole_netdev_xmit(): Dropping skb.
[  816.776067] blackhole_netdev_xmit(): Dropping skb.
[  864.695401] blackhole_netdev_xmit(): Dropping skb.
[  864.695471] blackhole_netdev_xmit(): Dropping skb.
[  864.695506] blackhole_netdev_xmit(): Dropping skb.
[  864.695544] blackhole_netdev_xmit(): Dropping skb.
[  895.922361] blackhole_netdev_xmit(): Dropping skb.
[  895.922424] blackhole_netdev_xmit(): Dropping skb.
[  895.922459] blackhole_netdev_xmit(): Dropping skb.
[  895.922496] blackhole_netdev_xmit(): Dropping skb.