[    2.480166] ip (277) used greatest stack depth: 12368 bytes left
[    2.526874] ip (281) used greatest stack depth: 12352 bytes left
[   14.555285] ip (1170) used greatest stack depth: 12280 bytes left
[  893.071709] blackhole_netdev_xmit(): Dropping skb.
[  893.071864] blackhole_netdev_xmit(): Dropping skb.
[  893.071912] blackhole_netdev_xmit(): Dropping skb.
[  893.071949] blackhole_netdev_xmit(): Dropping skb.
[  947.718361] blackhole_netdev_xmit(): Dropping skb.
[  947.718423] blackhole_netdev_xmit(): Dropping skb.
[  947.718475] blackhole_netdev_xmit(): Dropping skb.
[  947.718530] blackhole_netdev_xmit(): Dropping skb.