Re: Kernel XFS(..?) regression (& with/2.6.31-rc6)

From: Justin Piszcz
Date: Mon Aug 24 2009 - 07:05:02 EST

On Sun, 23 Aug 2009, Christoph Hellwig wrote:

Ok, let's see where errors could happen then.

There are four theoretical possibilities:

(a) XFS
(b) loop driver
(c) crypto loop code
(d) block layer

Or combinations thereof.

I would take (a) and (d) as more unlikely as they tend to get used much
more and I would have heard more bug reports already.

The cryptoloop code hasn't changed at all since 2.6.29.

The loop code howver has a very interesting commit just after 2.6.39:

commit 68db1961bbf4e16c220ccec4a780e966bc1fece3
Author: Nikanth Karthikesan <knikanth@xxxxxxx>
Date: Tue Mar 24 12:29:54 2009 +0100

loop: support barrier writes

Can you try reverting this one (it cleanly reverse-applies against
2.6.30 and current mainline) and see if that makes a difference?

Hello Christoph,

# patch -p1 -R < ../unpatch.patch
patching file drivers/block/loop.c
Hunk #1 succeeded at 473 (offset -1 lines).
Hunk #2 succeeded at 804 (offset -22 lines).

Patched, we'll see if the problem recurs.. thanks!

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