In the sourceforge mailing list for aufs, the main developer recently posted the following:
http://sourceforge.net/mailarchive/f...ame=aufs-users

And more importantly, the aufs module in debian is totally broken. Last
time I saw aufs in debian, they use TOO OLD version which is obsoleted
and not maintained. Additionally they made their original changes. It
means I cannot support aufs in debian.
Maybe the safest thing is to get the source off sourceforge and proceed?