linux-kernel - Re: Corrupted files after suspend to disk

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Date:	Mon, 12 Mar 2012 17:49:15 -0400
From:	Dave Jones <davej@...hat.com>
To:	Andreas Hartmann <andihartmann@...19freenet.de>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	keithp@...thp.com
Subject: Re: Corrupted files after suspend to disk

On Mon, Mar 12, 2012 at 02:24:00PM +0100, Andreas Hartmann wrote:
 
 > >>>>> This is happening to me as well. Something like 1 resume out of 5 goes
 > >>>>> wrong this very same way.
 > >>>>>
 > >>>>> This is thinkpad x200s.
 > >>>>>
 > >>>>> All the userspace is segfaulting all over the place (most frequently in
 > >>>>> libselinux for some reason).
 > >>>>>
 > >>>>> I am not able to verify the 'drop_caches' theory, as I can't invoke a
 > >>>>> single command that wouldn't crash.
 > >>>>
 > >>>> The question is how should we proceed?
 > >>>> I've reported this issue one year (!!!) ago.
 > >>>
 > >>> Hmm, 3.3-rcX seems to be the first version when it started to happen to
 > >>> me. I take it that you have seen this also with 3.2? 3.1?
 > >>
 > >> Quote from my very first email:
 > >> "I'm facing a very strange problem on my netbook (Lenovo Ideapad S10)
 > >> running Linux 2.6.37.4."
 > > 
 > > So we both seem to have Lenovos at least. I thus wanted to verify whether 
 > > the problem will trigger with thinkpad_acpi removed, but it oopsed while 
 > > rmmoding :) I will start looking into this right away.
 > > 
 > > Is your system using thinkpad_acpi as well?
 > 
 > I dont't think, that it is lenovo related as I'm having a MSI machine.
 > 
 > https://bugzilla.novell.com/show_bug.cgi?id=732908
 > 
 > Following the link, you are able to compare the used chips - maybe there
 > are some equal components?

This looks like the i915 corruption problem mentioned in a few other threads.

if you compare the hexdump of the good/bad files, you find that the corruption
happens in 8x 4 byte writes of either 0x00000000 or 0x00aaaaaa.

KeithP clued me in last week that that looks like an ARGB pixel quad, so these
writes are likely 8 pixel strips.

	Dave
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