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

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Message-ID: <4A966F7D.60707@kernel.org>
Date:	Thu, 27 Aug 2009 20:35:25 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Tim Blechmann <tim@...ngt.org>
CC:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: 2.6.31-rc5 regression: hd don't show up

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.

Thanks.

-- 
tejun

View attachment "nodev-debug.patch" of type "text/x-patch" (3395 bytes)