linux-kernel - Re: 2.6.31-rc5 regression: hd don't show up

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Date:	Tue, 08 Sep 2009 22:58:17 +0200
From:	Tim Blechmann <tim@...ngt.org>
To:	Tejun Heo <tj@...nel.org>
CC:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: 2.6.31-rc5 regression: hd don't show up

On 09/05/2009 02:12 AM, Tejun Heo wrote:
> Tim Blechmann wrote:
>>>>>>>> booting the machine today, one hd is missing again ... bootlog attached
>>>>>>> Hmmm... strange.  I don't really see how it could be escaping.  Can
>>>>>>> you please apply the attached patch?  It still won't change the
>>>>>>> behavior but should be able to catch where it's escaping.
>>>>>> attached you find two bootlogs, for a correct boot, and with one hd
>>>>>> missing ...
>>>>> Heh heh, this is getting a bit embarrassing.  Seems like I wasn't
>>>>> looking at the right path.  Can you please try this one too?  If it
>>>>> says "XXX D7 pulldown quick exit path" and then succeed to probe,
>>>>> that's the previous failure case so you don't need to keep trying to
>>>>> reproduce the problem.
>>>> i've attached the two boot logs again ...
>>> Okay, it was another wrong guess.  Can you please try this one?
>>
>> unfortunately, i haven't been able to get a bootlog of a failure the
>> issue after rebooting like 20 times with yesterday's linus/master.
>> once i couldn't boot, since the root hd wasn't found, so i don't think,
>> the issue is solved, it just doesn't show very frequently ...
>>
>> the bootlog of a working system is attached, if i experience another
>> issue, i will send you another bootlog. since i am out of town for a few
>> days, it may take some time, though ...
> 
> Alright, please keep me posted.  Another possibility is that it's
> timing related and the PHY goes down briefly post-reset.  I think I've
> found the code path but not sure yet and given how many times my hunch
> has been wrong on this case, not too confident either.  Anyways, if
> it's timing related, too many printks could have thrown it off.  If
> you can't reproduce the failure with the previous patch, please try
> this one and see whether it prints out "XXX: clearing to
> ATA_DEV_NONE" on failure.

with this patch, i could reproduce it again on the first boot. bootlog
attached.

cheers, tim

-- 
tim@...ngt.org
http://tim.klingt.org

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