linux-kernel - Re: 2.6.19-rc3: known unfixed regressions (v3)

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Date:	Mon, 30 Oct 2006 12:20:30 -0500
From:	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>
To:	"Michael S. Tsirkin" <mst@...lanox.co.il>
CC:	Martin Lorenz <martin@...enz.eu.org>, Pavel Machek <pavel@...e.cz>,
	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, linux-acpi@...r.kernel.org, linux-pm@...l.org,
	"Randy.Dunlap" <rdunlap@...otime.net>
Subject: Re: 2.6.19-rc3: known unfixed regressions (v3)

Hi Michael,

Michael S. Tsirkin wrote:
>> The code is related to bd_claim_by_disk which is called when
>> device-mapper or md tries to mark the underlying devices
>> for exclusive use and creates symlinks from/to the devices
>> in sysfs. The patch added error handlings which weren't in
>> the original code.
>>
>> I have no idea how it affects ACPI event handling.
> 
> It's a mystery. Probably exposes a bug somewhere?
> 
>> Are you using dm and/or md on your machine?
> 
> The .config is attached to bugzilla.

OK, I found you disabled CONFIG_MD, which means neither
dm.ko nor md.ko was built.
Do you have any out-of-tree kernel modules which call either
bd_claim_by_kobject or bd_claim_by_disk?

If you aren't using either of them, I'm afraid reverting
the patch doesn't really solve your problem because the patched
code is called only from them.

>> Have you seen any unusual kernel messages or symptoms regarding
>> dm/md before the ACPI problem occurs?
> 
> I haven't.

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America
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