linux-kernel - Re: linux-next: Tree for Aug 13 [ screen corruption in graphical mode ]

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 13 Aug 2013 17:59:29 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...il.com>,
	DRI <dri-devel@...ts.freedesktop.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	"s.dilek" <s.dilek@...erlin.de>
Subject: Re: linux-next: Tree for Aug 13 [ screen corruption in graphical mode ]

On Tue, Aug 13, 2013 at 4:45 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> On Tue, Aug 13, 2013 at 4:07 PM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>> On Tue, Aug 13, 2013 at 11:57 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
>>> On Tue, Aug 13, 2013 at 11:52 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>> On Tue, Aug 13, 2013 at 11:47:19AM +0200, Sedat Dilek wrote:
>>>>> On Tue, Aug 13, 2013 at 11:39 AM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
>>>>> > On Tue, Aug 13, 2013 at 11:35:53AM +0200, Sedat Dilek wrote:
>>>>> >> After a logout from my "BROKEN" Unity-2D session - the login-screen
>>>>> >> for LightDM seems to be OK.
>>>>> >> Then entering my Unity-2D desktop is OK - no screen corruptions.
>>>>> >
>>>>> > What hardware and display do you have?
>>>>>
>>>>> It's a Samsung ultrabook with SandyBridge CPU.
>>>>>
>>>>> [   333.291] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD
>>>>> Graphics 3000
>>>>
>>>> using LVDS.
>>>>
>>>>> - Sedat -
>>>>>
>>>>> P.S.: I switched to intel-ddx v2-21-14-35-g5840bf in the meantime.
>>>>
>>>> Did that make a difference? It shouldn't if the error is occuring before
>>>> X even starts...
>>>
>>> NO, was just confused not seeing "GT2" (HD-3000 was new to me) in my
>>> Xorg.log :-).
>>>
>>> As said logging out of Unity-2D and entering LightDM greeter - screen is fine.
>>> Starting again a Unity-2D session - no screen corruption, too.
>>>
>>> - Sedat -
>>
>> Some more testing:
>>
>> [1] With my X stack:
>>
>> FIRST BAD: next-20130812
>> LAST GOOD: next-20130809
>>
>> [2] With Ubuntu's X stack:
>>
>> next-20130813 is OK (Xorg.log attached)
>>
>
> drm-intel-nightly is also BAD with my X stack (with Ubuntu's X stack
> no problems).
>

I have bisected the issue on Linux v3.11-rc5 + drm-intel-nightly:

5456fe3882812aba251886e36fe55bfefb8e8829 is the first bad commit
commit 5456fe3882812aba251886e36fe55bfefb8e8829
Author: Chris Wilson <chris@...is-wilson.co.uk>
Date:   Thu Aug 8 14:41:07 2013 +0100

    drm/i915: Allocate LLC ringbuffers from stolen

    As stolen objects now behave identically (wrt to default LLC cacheing)
    as their normal system counterparts, we no longer have to differentiate
    our usage for ringbuffers. So allocate them from stolen on SNB+ as well.

    Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
    Reviewed-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>

:040000 040000 de063a052f39095f4d2f51b49caef9f827df41e8
1c819aa5501a9fcc9912a5c7c037c71b9b9e9a6b M      drivers

See also attached files!

- Sedat -

View attachment "git-bisect-log.txt" of type "text/plain" (1756 bytes)

View attachment "git-bisect-view-stat.txt" of type "text/plain" (705 bytes)

View attachment "git-bisect-visualize.txt" of type "text/plain" (606 bytes)