[    2.045731] ip (244) used greatest stack depth: 12832 bytes left
[    2.120128] ip (250) used greatest stack depth: 12624 bytes left
[    2.617561] ip (278) used greatest stack depth: 12368 bytes left
[    2.662455] ip (282) used greatest stack depth: 12352 bytes left
[  674.647748] blackhole_netdev_xmit(): Dropping skb.
[  674.647833] blackhole_netdev_xmit(): Dropping skb.
[  674.647881] blackhole_netdev_xmit(): Dropping skb.
[  674.647932] blackhole_netdev_xmit(): Dropping skb.
[  846.823860] blackhole_netdev_xmit(): Dropping skb.
[  846.823919] blackhole_netdev_xmit(): Dropping skb.
[  846.823948] blackhole_netdev_xmit(): Dropping skb.
[  846.823975] blackhole_netdev_xmit(): Dropping skb.
[ 1008.379410] blackhole_netdev_xmit(): Dropping skb.
[ 1008.379473] blackhole_netdev_xmit(): Dropping skb.
[ 1008.379505] blackhole_netdev_xmit(): Dropping skb.
[ 1008.379538] blackhole_netdev_xmit(): Dropping skb.