Comment 8 for bug 716811

In investigating this a bit further it appears the server will respond with nfsv4 by default even if not specifically requested as vers=4 by the client. I guess that causes problems when you've set the server up for sending nfsv3. Anyway, I've modified nfs-utils defaults file to include a comment as to how to disable nfsv4 in case you want to only do version 3. So far, system seems stable after a couple reboots and a few minute's nfs usage (although the crash was intermittent about every day or so, so we'll have to see).