linux-kernel - Re: [4/5] 2.6.21-rc5: known regressions

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Message-ID: <m13b3qzumf.fsf@ebiederm.dsl.xmission.com>
Date:	Tue, 27 Mar 2007 07:25:12 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Marcus Better <marcus@...ter.se>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Meyer <thomas@...3r.de>,
	Frédéric Riss <frederic.riss@...il.com>
Subject: Re: [4/5] 2.6.21-rc5: known regressions

Marcus Better <marcus@...ter.se> writes:

>> Subject    : second suspend to disk in a row results in an oops  (MSI)
>> References : http://lkml.org/lkml/2007/3/17/43
>>              http://lkml.org/lkml/2007/3/22/150
>>              http://lkml.org/lkml/2007/3/26/205
>>              http://lkml.org/lkml/2007/3/26/76
>> Submitter  : Thomas Meyer <thomas@...3r.de>
>>              Frédéric Riss <frederic.riss@...il.com>
>>              Marcus Better <marcus@...ter.se>
>> Handled-By : Eric W. Biederman <ebiederm@...ssion.com>
>> Patch      : http://lkml.org/lkml/2007/3/24/136
>> Status     : patch was suggested
>
> For the sake of completeness, my bisection resulted in this:
>
> 392ee1e6dd901db6c4504617476f6442ed91f72d is first bad commit
> commit 392ee1e6dd901db6c4504617476f6442ed91f72d
> Author: Eric W. Biederman <ebiederm@...ssion.com>
> Date:   Thu Mar 8 13:04:57 2007 -0700
>
>     [PATCH] msi: Safer state caching.

Right.  However if this is what Thomas was seeing the problem turned
out to be an issue with pci_enable_device changing the irq number.
It just happens that now the code cares, so the bug is found.

Marcus any chance I could see an oops?  Or you could try the patch I
previously posted when debugging this with Thomas.

I'm going to clean that patch up and send it along in hopes that it
helps anyway and see where we land.

Eric
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