Re: nfsd4 xdr encoding fixes v2

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On Tue, May 13, 2014 at 10:48:26AM -0400, J. Bruce Fields wrote:
> On Tue, May 13, 2014 at 04:09:45AM -0700, Christoph Hellwig wrote:
> > On Mon, May 12, 2014 at 09:11:28AM -0700, Christoph Hellwig wrote:
> > > On Mon, May 12, 2014 at 12:07:41PM -0400, J. Bruce Fields wrote:
> > > > On Mon, May 12, 2014 at 01:20:59AM -0700, Christoph Hellwig wrote:
> > > > > This series seem to cause hangs during xfstests against a server on the
> > > > > same VM.  The trace is fairly similar every the hang happens, but the
> > > > > point at which it happens differs:
> > > > 
> > > > Ouch, OK, and you're sure it starts with this series?
> > > > 
> > > > I guess I should try to replicate it here.  Might take a copule days.
> > 
> > Seems lile "nfsd4: allow exotic read compounds" is the culprit.
> 
> OK, it makes sense that the problem would be there.  Looking....

I got xfstests set up and can reproduce some problems (a hang, the
nfs4svc_encode_compoundres WARN, and some allocation failures), though
not exactly what you reported.

I also notice that commit ("nfsd4: allow exotic read compounds") has a
lot of extraneous cleanup that I should split out.

Anyway, thanks for the report, I'll investigate some more tomorrow....

--b.
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