From: Kasparek Tomas <kasparek@fit.vutbr.cz>
Subject: Re: NFS corruption in 2.6.18.2?
Date: Wed, 15 Nov 2006 18:29:47 +0100
Message-ID: <20061115172947.GM10830@fit.vutbr.cz>
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Cc: "nfs@lists.sourceforge.net" <nfs@lists.sourceforge.net>
To: Fredrik Lindgren <fli@swip.net>
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On Tue, Nov 14, 2006 at 07:09:17PM +0100, Fredrik Lindgren wrote:
> Hello
> 
> We're running a mail system with Linux machines being served by two
> NetApps. (Debian stable, our "own" kernel off kernel.org)
> 
> At present we're running 2.6.13 kernels, we had some corruption issues
> before that was fixed in 2.6.13. However when we tried to upgrade
> to 2.6.18.2 the we see corruption again.
> 
> pre 2.6.13 the problem seemed to be that the file size was being
> cached, which meant that sometimes there were blocks of NULL
> characters in the files.
> 
> With 2.6.18.2 we see blocks of NULL chars in the data again, this time
> it's sometimes in the middle of a message. pre 2.6.13 that didn't
> happen,
> then there were just big blocks of NULL chars between two messages. 
> The only consistent thing is that it only occurs when the 1 machine
> running 2.6.18.2 (out of 5) has delivered a message to the spool-file.
> 
> I don't know if it's relevant, but when checking the NFS stats I see
> the 2.6.18.2 machine doing almost precisely half the amount of "GetAttr"
> calls compared to the 2.6.13 machines.
> 
> Is this something anyone else has seen?
> 
> Also on a side note, the statistics still seem to be using signed
> values, so we're seeing negative numbers on some stats after some
> uptime. This is true for both using "nfsstat" and "cat
> /proc/net/rpc/nfs.

I have seen this behaviour with kernel 2.6.18 and above up to 19-rc4.
Reported this, but no response.

http://lkml.org/lkml/2006/9/28/89

--   

  Tomas Kasparek, PhD student  E-mail: kasparek@fit.vutbr.cz
  CVT FIT VUT Brno, BI/140a    Web:    http://www.fit.vutbr.cz/~kasparek
  Bozetechova 2, 612 66        Fax:    +420 54114-1270
  Brno, Czech Republic         Phone:  +420 54114-1220

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