linux-ext4 - Re: 2.6.32.4 - still getting ext4 related crashes

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Date:	Wed, 27 Jan 2010 15:40:06 -0500
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Nikola Ciprich <extmaillist@...uxbox.cz>
CC:	tytso@....edu, Nikola Ciprich <nikola.ciprich@...uxbox.cz>,
	ext4 maillist <linux-ext4@...r.kernel.org>,
	IDE/ATA development list <linux-ide@...r.kernel.org>
Subject: Re: 2.6.32.4 - still getting ext4 related crashes

On 01/26/2010 03:47 PM, Nikola Ciprich wrote:
> Hello Theo,
> Actually it's ME who appreciates YOUR efforts ;)
> I'm sorry for late reply, I did a lot of testing and I've been a bit
> busy lately.
> It's getting quite weird. I  can 100% reproduce it.
> BUT - the thing is, I can reproduce it only on external eSATA box with
> long eSATA cable. I've tried it on two different machines, and with
> two different disk boxes. Using shorter cabling seems to fix the problem.
> I'd just close the problem stating that it's caused byt crappy cable,
> but what worries me is why it was working with older kernels?
> Does it mean our backups were just silently being damaged and new
> kernel somehow detects the problem? (and if it's the hw problem,
> kernel could maybe show it the better way then just crashing).
> I'm going to repeat tests with older kernels which were working
> OK, and I can also test newer ones. I'll also try to get new
> cable of same length to check it again.
> Do You have any other ideas what else I should check?
> with best regards
> nik
>
>    

Hi Nik,

If you only see this with an external S-ATA box and a long cable, we 
might have issues with S-ATA (and knock on issues with error handling up 
the stack).

Can you summarize/repost the log of the panic with the linux-ide people 
cc'ed (added above)?

Thanks!

Ric

>
> On Sun, Jan 24, 2010 at 04:48:53AM -0500, tytso@....edu wrote:
>    
>> On Sun, Jan 24, 2010 at 08:19:43AM +0100, Nikola Ciprich wrote:
>>      
>>> Hi,
>>> yes, I can reproduce it reliably, I'll give it a try tomorrow and
>>> report.
>>> have a nice day.
>>>        
>> Thanks, I appreciate it.  If it does reproduce on 2.6.33-rc3+, could
>> you send me the output of "dumpe2fs -h /dev/XXX"?
>>
>> Best regards,
>>
>> 					- Ted
>> --
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>>      
>    

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