On Sun, Mar 17, 2013 at 03:11:21PM -0700, [email protected] wrote:
> On Sun, 17 Mar 2013 21:37:23 +0000
> Chris Wilson <[email protected]> wrote:
> 
> > On Sun, Mar 17, 2013 at 01:21:57PM -0700, [email protected] 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 <[email protected]>
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 <[email protected]>
    Signed-off-by: Dmitry Rogozhkin <[email protected]>
    Reviewed-by: Chris Wilson <[email protected]>
    Signed-off-by: Daniel Vetter <[email protected]>

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

-- 
Chris Wilson, Intel Open Source Technology Centre
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