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

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Message-ID: <4A97B9C0.9090003@klingt.org>
Date:	Fri, 28 Aug 2009 13:04:32 +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 08/27/2009 01:35 PM, Tejun Heo wrote:
> Tim Blechmann wrote:
>> On 08/27/2009 10:38 AM, Tejun Heo wrote:
>>> Tim Blechmann wrote:
>>>>>>>> running 2.6.31-rc5 (7cb7beb31aa3d941833b6a6e553687422c31e4b6 to be
>>>>>>>> exact), sometimes some hard disks don't show up.
>>>>>>>>
>>>>>>>> after booting, my root hd (sda) is mounted to /, while two other hds
>>>>>>>> (sdb/sdc) are mounted as a user. sda is always present, but the other
>>>>>>>> two sometimes don't show up (i.e. they are not listed in /dev/disk/, nor
>>>>>>>> to they have a /dev/sdX link). with 2.6.29 and 2.6.30, all three disks
>>>>>>>> are reported correctly.
>>>>>>> Can you please attach boot logs of a successful and a failed boot?
>>>>>> i have two files attached:
>>>>>> - dmesg_good - all hds are available
>>>>>> - dmesg_bad - on hd is missing
>>>>> Can you please apply the attached patch and post the bad boot log?
>>>> attached you find boot logs for both a good ad a bad boot
>>> Sorry about the long delay.  I somehow marked the message read without
>>> actually reading it.
>>>
>>> I suspected the problem was with getting the wrong classification code
>>> or phantom device detection kicking in spuriously.  Looks like the
>>> problem happens way before that.  Can you please apply the attached
>>> patch and report the result?
>>
>> i applied your patch onto of the current linus/master branch and
>> currently (after rebooting 5 or 6 times) i cannot reproduce the problem
>> any more ...
>> however, there is a warning stack trace in the boot log from libata code
>> (bootlog attached)
> 
> Oops, that was my bad.  This should remove the useless warning.

booting the machine today, one hd is missing again ... bootlog attached

hth, tim

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

I must say I find television very educational. The minute somebody
turns it on, I go to the library and read a good book.
  Groucho Marx

View attachment "bootlog_bad" of type "text/plain" (57400 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (198 bytes)