Re: NFS regression in 2.6.37.1 (current stable)

[Trond Myklebust]

On Thu, 2011-03-10 at 18:53 +0000, Dr Andrew John Hughes wrote: 
> [Please CC me on responses as I'm not subscribed]
> 
> Hi,
> 
> I seem to have uncovered a regression in the NFS code between 2.6.37 and 2.6.37.1
> caused by this changeset:
> 
> commit 55ea499d60aefa3d03a77fc8590c26b5881faa92
> Author: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
> Date:   Sat Jan 8 17:45:38 2011 -0500
> NFS: Don't use vm_map_ram() in readdir
> http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.37.y.git;a=commit;h=6650239a4b01077e80d5a4468562756d77afaa59
> 
> With this change applied, copying of files between NFS and non-NFS
> mounts seems to be broken.  The easiest way I've found to replicate
> this myself is to use a VCS to do a clone of a tree on a NFS mount to
> a directory on a non-NFS mount.  I used Mercurial, as I had Mercurial
> trees to hand from work on IcedTea, but I assume doing it with a git
> tree such as the linux tree would also work.  The idea is to do
> something which involves copying over a bunch of directories and
> checking the result is readable.
> 
> $ hg clone $HOME/projects/openjdk/icedtea6-hg
> destination directory: icedtea6-hg
> updating to branch default
> abort:
> data/contrib/templater/hotspot/src/cpu/CPU/vm/bytecodeInterpreter_CPU.inline.hpp.i@16d04ce16287:
> no match found!
> 
> In the above, $HOME is an NFS mount and $PWD is a local reiserfs
> partition.  I initially hit failures doing builds with source on $HOME
> and the build directory on a local reiserfs partition.  In that
> scenario, it would fail as not being able to find files that should
> have been copied over.
> 
> Reverting the changeset fixes the issue.  2.6.37.2 still has the bug.
> I haven't checked 2.6.37.3 yet but I didn't see any NFS changes in there.
> --
> Andrew :)
> 
> Free Java Software Engineer
> Red Hat, Inc. (http://www.redhat.com)

It looks to me as if you are hitting the issue that was fixed in
mainline by commit d1205f87bbb8040c1408bbd9e0a720310b2b0b9b (NFS: NFSv4
readdir loses entries). That commit was labelled as "Cc:
stable@xxxxxxxxxx" but has still not made it into the 2.6.37 stable
series.

I've attached it below...

Cheers
  Trond

8<-------------------------------------------------------------------