[    2.442035] ip (276) used greatest stack depth: 12320 bytes left
[   14.011000] ip (1171) used greatest stack depth: 12272 bytes left
[   24.758146] ip (2367) used greatest stack depth: 12160 bytes left
[  899.758931] blackhole_netdev_xmit(): Dropping skb.
[  899.759193] blackhole_netdev_xmit(): Dropping skb.
[  899.759229] blackhole_netdev_xmit(): Dropping skb.
[  899.759260] blackhole_netdev_xmit(): Dropping skb.