Re: NFS EINVAL on open(... | O_TRUNC) on 2.6.23.9

On Wed, 06 Feb 2008 22:55:02 +0100
Gianluca Alberici <gianluca@xxxxxxxxxxxxxxx> wrote:

I finally got it. Problem and solution have been found from 6 month but
nobody cared...up to now those servers have not been mantained, this
problem is not discussed anywhere else than the following link.
The bug (userspace server side i would say at this point) is well
described from the author of an nfs-user-server patch which has not been
managed yet. The magic hint to find it on google was 'nfs server
utimensat' :-)

http://marc.info/?l=linux-nfs&m=118724649406144&w=2

This is pretty significant. We have on several occasions in recent years
tightened up the argument checking on long-standing system calls and it's
always a concern that this will break previously-working applications.

And now it has happened.

If we put buggy code into the kernel then we're largely stuck with it: we
need to be back-compatible with our bugs so we don't break things like
this.

I have already prepared a working patch for cfsd based upon the one ive
listed. The nfs patch is of course waiting for commit since august,
2007. Ill submit it to debian cfsd mantainers, hoping to have more
chance than my predecessor.
It doesnt seem to me that there was any kernel related issue.

Thanks a lot again, sorry for the lots of noise i have done. I will try
to be more appropriate next time.

That wasn't noise - it was quite valuable. Thanks for all the work you did
on this.


Given that our broken-by-unbreaking code has been out there in several
releases there isn't really any point in rebreaking it to fix this - the
offending applications need to be repaired so they'll work on 2.6.22 and
2.6.23 anyway.

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