[    2.467959] ip (280) used greatest stack depth: 12360 bytes left
[    2.517451] ip (284) used greatest stack depth: 12344 bytes left
[  896.649714] blackhole_netdev_xmit(): Dropping skb.
[  896.649813] blackhole_netdev_xmit(): Dropping skb.
[  896.649850] blackhole_netdev_xmit(): Dropping skb.
[  896.649889] blackhole_netdev_xmit(): Dropping skb.
[ 1206.565629] blackhole_netdev_xmit(): Dropping skb.
[ 1206.565711] blackhole_netdev_xmit(): Dropping skb.
[ 1206.565764] blackhole_netdev_xmit(): Dropping skb.
[ 1206.565807] blackhole_netdev_xmit(): Dropping skb.