[    2.005619] ip (243) used greatest stack depth: 12832 bytes left
[    2.077155] ip (249) used greatest stack depth: 12384 bytes left
[    2.642340] ip (277) used greatest stack depth: 12352 bytes left
[    2.690498] ip (281) used greatest stack depth: 12136 bytes left
[  843.352708] blackhole_netdev_xmit(): Dropping skb.
[  843.352778] blackhole_netdev_xmit(): Dropping skb.
[  843.352809] blackhole_netdev_xmit(): Dropping skb.
[  843.352843] blackhole_netdev_xmit(): Dropping skb.
[ 1229.695340] blackhole_netdev_xmit(): Dropping skb.
[ 1229.695406] blackhole_netdev_xmit(): Dropping skb.
[ 1229.695434] blackhole_netdev_xmit(): Dropping skb.
[ 1229.695466] blackhole_netdev_xmit(): Dropping skb.