linux-kernel - Re: 3.12: kernel panic when resuming from suspend to RAM (x86

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Message-ID: <528DC2AA.4070202@gmail.com>
Date:	Thu, 21 Nov 2013 09:22:02 +0100
From:	Francis Moreau <francis.moro@...il.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: 3.12: kernel panic when resuming from suspend to RAM (x86_64)

On 11/20/2013 12:15 PM, Borislav Petkov wrote:
> On Wed, Nov 20, 2013 at 10:45:05AM +0100, Francis Moreau wrote:
>> Unfortunately the bisect session didn't give any positive results: I
>> couldn't be sure if a specific revision was good or bad because the
>> bug wasn't reproductible every time.
>>
>> But I got a different kernel oops on my stripped system that may give
>> us a clue: http://imgur.com/zdCknbY
>>
>> Does this help ?
> 
> Unfortunately, this is the second oops:
> 
[...]
> 
> and judging by the instruction, that's addr in %rdi which we try to read
> and I'd guess %rdi contains garbage after resume.
> 
> IOW, this looks like another corruption that happens when you suspend to
> ram.

Hmm, I think it's more than that because if I'm removing both
rtsx_pci_ms and memstick modules, then suspending and resuming doesn't
oops anymore.

Also I took a look at the changes between v3.11 and v3.12 in this area
and those changes match the issue I'm facing:

$ git log --oneline v3.11..v3.12 -- drivers/mfd/rtsx_pcr.c
09fd867 mfd: rtsx: Copyright modifications
eb891c6 mfd: rtsx: Configure to enter a deeper power-saving mode in S3
7140812 mfd: rtsx: Move some actions from rtsx_pci_init_hw to individual
extra_init_hw
5947c16 mfd: rtsx: Add shutdown callback in rtsx_pci_driver
773ccdf mfd: rtsx: Read vendor setting from config space

I'll try to bisect one more time those changes tonight to see if I can
find out if one of those commits is the culprit.

> 
> I asked you already but you didn't say:
> 
> "Also, you can check for BIOS updates for your machine and if there are,
> check their changelogs whether they fix something suspend-related."
> 

Sorry for not answering the first time, but yes my bios is uptodate.

Thanks.
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