[    1.612987] ip (242) used greatest stack depth: 12832 bytes left
[    2.021171] ip (276) used greatest stack depth: 12320 bytes left
[    2.054135] ip (280) used greatest stack depth: 12272 bytes left
[  770.580271] blackhole_netdev_xmit(): Dropping skb.
[  770.580344] blackhole_netdev_xmit(): Dropping skb.
[  770.580392] blackhole_netdev_xmit(): Dropping skb.
[  770.580438] blackhole_netdev_xmit(): Dropping skb.
[ 1091.314370] blackhole_netdev_xmit(): Dropping skb.
[ 1091.314440] blackhole_netdev_xmit(): Dropping skb.
[ 1091.314479] blackhole_netdev_xmit(): Dropping skb.
[ 1091.314515] blackhole_netdev_xmit(): Dropping skb.
[ 1191.921996] blackhole_netdev_xmit(): Dropping skb.
[ 1191.922052] blackhole_netdev_xmit(): Dropping skb.
[ 1191.922085] blackhole_netdev_xmit(): Dropping skb.
[ 1191.922120] blackhole_netdev_xmit(): Dropping skb.