linux-kernel - Re: NFS regression in 2.6.37.1 (current stable)

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Date:	Thu, 10 Mar 2011 21:37:31 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Marc Kleine-Budde <mkl@...gutronix.de>
Cc:	Dr Andrew John Hughes <ahughes@...hat.com>,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	Trond.Myklebust@...app.com, Greg KH <greg@...ah.com>
Subject: Re: NFS regression in 2.6.37.1 (current stable)

On Thu, Mar 10, 2011 at 8:59 PM, Marc Kleine-Budde <mkl@...gutronix.de> wrote:
> Hello Andrew,
>
> On 03/10/2011 07:53 PM, 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@...app.com>
>> 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@...04ce16287:
>> 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.
>
> Which arch are you using? As this patch is also part of the upcoming
> 2.6.38, can you check if the latest .38 is affected, too?

Looking at the Gentoo bug report, I think Andrew is using x86-64:

https://bugs.gentoo.org/show_bug.cgi?id=357121
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