[xorg] Problem with sna/xcomposite? (i915 video driver related)

[Chris Wilson]

On Sun, Mar 17, 2013 at 03:11:21PM -0700, animelovin at gmail.com wrote:
> On Sun, 17 Mar 2013 21:37:23 +0000
> Chris Wilson <chris at chris-wilson.co.uk> wrote:
> 
> > On Sun, Mar 17, 2013 at 01:21:57PM -0700, animelovin at gmail.com wrote:
> > > Hi,
> > > 
> > > After upgrade to intel-xorg-video 2.21.4 driver, (Intel 945GM chipset) xserver 1.12.4 crash repeatingly
> > > with sna enabled in xorg.conf. 
> > 
> > Your kernel is buggy.
> > -Chris
> > 
> > -- 
> > Chris Wilson, Intel Open Source Technology Centre
> 
> Yes i realize perhaps kernel 3.4.11 is unstable with this chipset... thus I will try upgrading to latest stable kernel (3.6.x) and rebuild intel video driver to see if i can repeat this bug with a more recent/updated version. 
The bug wasn't fixed until v3.7, I thought it was much earlier:

commit e79e0fe380847493266fba557217e2773c61bd1b
Author: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com>
Date:   Wed Oct 3 17:15:26 2012 +0300

    drm/i915: EBUSY status handling added to i915_gem_fault().
    
    Subsequent threads returning EBUSY from vm_insert_pfn() was not handled
    correctly. As a result concurrent access from new threads to
    mmapped data caused SIGBUS.
    
    Note that this fixes i-g-t/tests/gem_threaded_tiled_access.
    
    Tested-by: Mika Kuoppala <mika.kuoppala at intel.com>
    Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com>
    Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

I need to add some runtime detection for broken kernels. :(
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre