[    2.075488] ip (246) used greatest stack depth: 12320 bytes left
[  643.305042] ip (5285) used greatest stack depth: 12240 bytes left
[  648.563630] ip (5641) used greatest stack depth: 12176 bytes left
[  787.435966] blackhole_netdev_xmit(): Dropping skb.
[  787.436018] blackhole_netdev_xmit(): Dropping skb.
[  787.436058] blackhole_netdev_xmit(): Dropping skb.
[  787.436090] blackhole_netdev_xmit(): Dropping skb.
[ 1116.191489] blackhole_netdev_xmit(): Dropping skb.
[ 1116.191567] blackhole_netdev_xmit(): Dropping skb.
[ 1116.191610] blackhole_netdev_xmit(): Dropping skb.
[ 1116.191651] blackhole_netdev_xmit(): Dropping skb.
[ 1179.969414] blackhole_netdev_xmit(): Dropping skb.
[ 1179.969475] blackhole_netdev_xmit(): Dropping skb.
[ 1179.969507] blackhole_netdev_xmit(): Dropping skb.
[ 1179.969541] blackhole_netdev_xmit(): Dropping skb.