linux-kernel - Re: 2.6.29 acpi regression: acpi_ex_extract_from

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Message-ID: <49BE7EE6.3070107@gmail.com>
Date:	Mon, 16 Mar 2009 17:31:34 +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 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.

Thanks.
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