Move (mv) hangs with NFSv4

[Pierre Ossman <drzeus-list@drzeus.cx>]

I've been trying out NFSv4 instead of NFSv3 on the systems here and have
had mixed success. First of there was an uid/gid mapping bug which was
solved in 2.6.9.

Now I've run into another serious bug; I cannot move files to the NFS
filesystem. It stalls when the file is finished. I've tried with big and
small files (even 0 bytes) and the effect is the same.

I started guessing that it sets some attributes during the final stage
so i tried cp -a, which has the same effect. So this seems to support 
that theory. chmod and chown work fine. I don't know if there is some 
other command I can try that only messes with attributes.

There is no error message on the server. On the client I get "RPC: 
rpciod waiting on sync task!" now and then. Most of the time it doesn't 
say a thing though so I'm not sure it's related.

The server is a FC2 machine running 2.6.9-1.6_FC2 (also tried 2.6.8.1 +
uid/gid patch) and the clients are a FC2 machine with the same kernel
and a FC3 machine with a clean 2.6.9.

Rgds
Pierre


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