linux-kernel - Re: still nfs problems [Was: Linux 2.6.37-rc8]

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Message-ID: <20110105112701.GA8638@n2100.arm.linux.org.uk>
Date:	Wed, 5 Jan 2011 11:27:01 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	linux-nfs@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Marc Kleine-Budde <m.kleine-budde@...gutronix.de>
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]

On Wed, Jan 05, 2011 at 12:05:17PM +0100, Uwe Kleine-König wrote:
> Hello Trond,
> 
> On Wed, Jan 05, 2011 at 09:40:14AM +0100, Uwe Kleine-König wrote:
> > On Mon, Jan 03, 2011 at 07:22:38PM -0500, Trond Myklebust wrote:
> > > The question is whether this is something happening on the server or the
> > > client. Does an older client kernel boot without any trouble?
> > I will set up a boot test with 2.6.37 (for statistics) and 2.6.36 to
> > compare with.  If you don't consider .36 to be old enough let me now.
> > Once the setup is done it should be easy to test .35 (say), too.
> > 
> Marc (cc'd) saw similar[1] problems with .37, when using .36.2 the
> problems didn't occur.  This was more reliable to trigger and he was so
> kind to bisect the problem.
> 
> When testing v2.6.36-rc3-51-gafa8ccc init hanged.
> (babddc72a9468884ce1a23db3c3d54b0afa299f0 is the first bad commit with
> this hang.)  Commit 56e4ebf877b6043c289bda32a5a7385b80c17dee makes the
> "init hangs" problem the "fileid changed on tab" problem.
> 
> I could only reproduce that on armv5 machines (imx27, imx28 and at91)
> but not on armv6 (imx35).

FYI, I've seen the "fileid changed" problem, and it looked like a 32-bit
truncation of the fileid.  It occurred several times on successive
reboots, so I tried to capture a tcpdump trace off the server (Linux
2.6.23-rc8-ga64314e6 - its ancient because I've had issues with buggy
IDE drivers trying to move it forward.)  However, for the last couple
of weeks I've been unable to reproduce it.

The client was based on 2.6.37-rc6.

The "fileid changed" messages popped up after mounting an export with
'nolock,intr,rsize=4096,soft', and then trying to use bash completion
and 'ls' in a few subdirectories - and entries were missing from the
directory lists without 'ls' reporting any errors (which I think is bad
behaviour in itself.)

I don't know why it's stopped producing the errors, although once it
went I never investigated it any further (was far too busy trying to
get AMBA DMA support working.)
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