[    2.606399] ip (277) used greatest stack depth: 12336 bytes left
[    4.717405] ip (408) used greatest stack depth: 12320 bytes left
[  678.406548] blackhole_netdev_xmit(): Dropping skb.
[  678.406686] blackhole_netdev_xmit(): Dropping skb.
[  678.406734] blackhole_netdev_xmit(): Dropping skb.
[  678.406778] blackhole_netdev_xmit(): Dropping skb.
[  682.718685] blackhole_netdev_xmit(): Dropping skb.
[  682.718740] blackhole_netdev_xmit(): Dropping skb.
[  682.718773] blackhole_netdev_xmit(): Dropping skb.
[  682.718806] blackhole_netdev_xmit(): Dropping skb.
[ 1137.376140] blackhole_netdev_xmit(): Dropping skb.
[ 1137.376217] blackhole_netdev_xmit(): Dropping skb.
[ 1137.376250] blackhole_netdev_xmit(): Dropping skb.
[ 1137.376281] blackhole_netdev_xmit(): Dropping skb.