problems with nfs+TCP - Resource temporarily unavailable

Bernd Walter ticso at
Thu May 26 05:52:51 PDT 2005

On Thu, May 26, 2005 at 02:37:35PM +0200, Sten Spans wrote:
> On Thu, 26 May 2005, Bernd Walter wrote:
> >>>
> >>>This is absolutely known - TCP/nfs has bugs in realigning packets.
> >>>Don't use TCP on strong aligned architectures.
> >>
> >>Still a pr with a proper backtrace would be nice.
> >>Or does one exist already ?
> >
> >Not that I know.
> >I did know exactly when this happens years ago.
> >The backtrace as such will not help you as the panic happens much
> >later than the cause.
> >IIRC the basic problem was that the realignment code only fixes
> >a single missalignment, while theres a chance for more then one.
> >Verify nfs_realign in nfsserver and nfsclient to get an idea.
> >If you are interested - I've found a (non-working) patch that I wrote
> >for it, but the intention of it should be clear.
> >
> Sure. This is an nfsd specific problem,
> Or does nfsclient have issues as well ?

The code is the same in client and server - as well as the risk to get
packets in that form from network.

> I'll get a pr going to make sure that the issue
> is documented, and possibly narrowed down enough for
> other people to start painting a bikeshed about how
> it should be fixed.


B.Walter                   BWCT      
bernd at                                  info at

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