NFS deadlock (unkillable nfsd and no mounts work)

[Rick Macklem]

> Greetings!
> 
> I'm having a problem with nfsd hanging and not serving mount points,
> during which time it can not not be killed. This problem started
> happening sometime after November 2nd, since kernel from 11/2 sources
> does not exhibit this problem.

Please try the attached patch, rick
ps: Starting about Monday I won't be able to do commits for about 3 weeks
    so, if this patch works, could someone else please commit it, thanks,
    rick
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