linux-kernel - Re: 2.6.29 acpi regression: acpi_ex_extract_from

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Date:	Wed, 18 Mar 2009 09:08:51 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Lin Ming <ming.m.lin@...el.com>
CC:	robert.moore@...el.com, lenb@...nel.org,
	linux-acpi@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	torvalds@...ux-foundation.org
Subject: Re: 2.6.29 acpi regression: acpi_ex_extract_from_field -- div by
 zero

On 16.3.2009 17:31, Jiri Slaby wrote:
> On 16.3.2009 04:42, Lin Ming wrote:
>>> sometimes, when booting up/resuming from disk, I get an oops[1].
>>>
>>> obj_desc->common_field.access_bit_width is zero, but even after the
>>> loop. Division before the loop is apparently OK.
>>
>> Would please try below debug patch to see which region filed is
>> accessed?
>
> Yes, except the fact, we wouldn't see anything :) -- I'll add inside the
> if a return statement or something to disallow the oops to flood screen.
>
> Also, it doesn't happen regularly. Mostly several first tries after cold
> start. I hope this is a regression and not a HW problem, but it emerged
> after switching to 2.6.29-*, I will keep you informed.

Hmm, I didn't see it with rc8 and this patch applied so far (no 'ACPI 
Debug' in dmesg). Also I don't see anything changed within drivers/acpi/ 
et al. between rc7 and rc8. Maybe the timing changed somewhere else... 
I'm confused, but keep trying.
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