linux-kernel - Re: Strange write errors on FAT32 partition (maybe an FAT32 bug?!)

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Date:	Thu, 09 Nov 2006 14:54:32 -0600
From:	Roger Heflin <rheflin@...pa.com>
To:	Christoph Anton Mitterer <calestyo@...entia.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Strange write errors on FAT32 partition (maybe an FAT32 bug?!)


Christoph Anton Mitterer wrote:
> Roger Heflin wrote:
>> Christoph,
>>
>> Install then edac_mc module, and make sure  through the
>> sysctl command that pci parity checking is enabled.
>>
>> I have seen pci parity errors produce this sort of results,
>> ie make 100 identical 50MB files, and cksum them and one
>> will be wrong, do it a again, and the "wrong" one is now
>> right, but someone else is "wrong".
> Ah thx,... is it in the vanilla kernel?
> And do you know of any possible results that this issue has? When I just
> read data (see my original stuff with fat32) is it possible that this
> had been modified or damaged?
> Or are the only consequences that diff errors occur?
> 
> And what is responsible for that parity errors? Is it possible that any
> hardware is damaged?

The failure can manifest itself in many ways, I have
only seen it as a read failure, but there should be no
reason why it cannot also show as a write failure.

It should be in the later vanilla kernels, it won't
be in the earlier ones,  I would do a
find /lib/modules -name "*edac*" -ls

It is a hw issue, either something is running faster that
it should be (pci bus set to fast for the given hardware/config)
or something is broken.

                          Roger
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