linux-kernel - Re: [Linux-cachefs] CacheFiles: Readpage failed on backing file

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Message-ID: <alpine.DEB.2.01.0906230041490.6439@bogon>
Date:	Tue, 23 Jun 2009 00:49:39 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	David Howells <dhowells@...hat.com>
cc:	Linux filesystem caching discussion list 
	<linux-cachefs@...hat.com>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-cachefs] CacheFiles: Readpage failed on backing file

On Mon, 22 Jun 2009, Christian Kujau wrote:
> On Mon, 22 Jun 2009, David Howells wrote:
> >> [  399.332346]  [<ffffffff810da03a>] ? ext3_truncate+0x26a/0x9e0
> > 
> > Can you try the attached patch, please?
> 
> The patch helps, I think. Without this patch I was able to reproduce 
> this very quickly, just running "grep -lr foo /share/nfs" was enough to
> trigger the backtrace. With this patch, grep is still running (and 
> utilizing cachefiles) but no warnings so far.

Unfortunately, now the system just freezes when doing *a lot* of read
operations on the NFS share (grep -r foo again). I don't know if it's 
related to your patch or something else, debugging is kinda hard at the 
moment, as it's a Xen DomU (no netconsole; serial redirection magic still 
not working), it'll take me a while to figure out what's going on here.

FWIW, I'm able to compile kernels over this very same (readonly) NFS 
share, only "grep -r" was able to trigger the freeze.

Thanks,
Christian.
-- 
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