Confirmed.  Thanks for the report.

Update - this does not seems to happen on desktop version of IVB (Maho Bay).

I think Li Bo is using desktop IVB.

Li Bo, does it hang on our both desktop IVB machines (ivb3 and ivb4)?

I just used desktop version of IVB and I used Fedora 15.
But it didn't happened in ivb3.  
(In reply to comment #3)
> I think Li Bo is using desktop IVB.
> 
> Li Bo, does it hang on our both desktop IVB machines (ivb3 and ivb4)?

(In reply to comment #4)
> But it didn't happened in ivb3.  

to clarify: ivb3 is GT1 (2+1) and ivb4 is GT2 (4+2), both rev 04.

Eugeni, how about your machine?

(In reply to comment #5)
> (In reply to comment #4)
> > But it didn't happened in ivb3.  
> 
> to clarify: ivb3 is GT1 (2+1) and ivb4 is GT2 (4+2), both rev 04.
> 
> Eugeni, how about your machine?

Mine is IVB B0:
00:02.0 VGA compatible controller: Intel Corporation Device 0162 (rev 02)

I think Ken confirmed it on his desktop IVB as well.

I find this error also happened on another performance case "urbanterror",which makes machine hang.

Could you check if it still happens with latest mesa master or 7.11 branch, after latest patches from Ken there?

I'm still seeing Egypt hangs...and I don't have any idea why.

(In reply to comment #9)
> I'm still seeing Egypt hangs...and I don't have any idea why.
Hello, I have found when I set i915.semaphores=1, this game will not hangs

fixed in 3.2-rc6, with gpu semaphores enabled by default on IVB.

A patch referencing this bug report has been merged in Linux v3.2-rc6:

commit f45b55575cedb7efa782e43f1ea74338456d0381
Author: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date:   Fri Dec 9 17:16:37 2011 -0800

    drm/i915: enable semaphores on per-device defaults

GLBenchmark Egypt still hangs but less frequently on Linux v3.2.0 kernel. Reproduction rate can be greatly increased with additional patches that enable PPGTT.

System Environment:
Libdrm: 2.4.30+git20120110.66518ab5-0ubuntu0sarvatt~natty (xedgers)
Mesa: 8.0.0~git20120110.5a7c3433-0ubuntu0sarvatt~oneiric~natty (xedgers)
video-intel:   2:2.17.0+git20120113.94217a4d-0ubuntu0sarvatt~oneiric~natty (xedgers)
kernel: 3.2.0

I observed that the hangs are much more often if vsync is disabled (e.g., export vblank_mode=0 prior to running egypt benchmark).

I have tried again with 'vblank_mode=0' on both mobile and desktop version of IVB.
Run around 20 times, I could see a machine hang on both versions.
The desktop version of IVB I used is the one Gordon mentioned as ivb4

A patch referencing this bug report has been merged in Linux v3.3-rc5:

commit d71de14ddf423ccc9a2e3f7e37553c99ead20d7c
Author: Kenneth Graunke <kenneth@whitecape.org>
Date:   Wed Feb 8 12:53:52 2012 -0800

    drm/i915: gen7: Disable the RHWO optimization as it can cause GPU hangs.

A patch referencing this bug report has been merged in Linux v3.3-rc5:

commit eae66b50c760233fad526edf4a0d327be17a055d
Author: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date:   Wed Feb 8 12:53:49 2012 -0800

    drm/i915: gen7: implement rczunit workaround

A patch referencing this bug report has been merged in Linux v3.3-rc5:

commit db099c8f963fe656108e0a068274c5580a17f69b
Author: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date:   Wed Feb 8 12:53:51 2012 -0800

    drm/i915: gen7: work around a system hang on IVB

A patch referencing this bug report has been merged in Linux v3.3-rc5:

commit e4e0c058a19c41150d12ad2d3023b3cf09c5de67
Author: Eugeni Dodonov <eugeni.dodonov@intel.com>
Date:   Wed Feb 8 12:53:50 2012 -0800

    drm/i915: gen7: Implement an L3 caching workaround.

Should be fixed with those kernel patches.

I have verified it and issue has been fixed.
commit eae66b50c760233fad526edf4a0d327be17a055d

A patch referencing this bug report has been merged in Linux v3.4-rc1:

commit e21af88d39796c907c38648c824be3d646ffbe35
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Thu Feb 9 20:53:27 2012 +0100

    drm/i915: enable ppgtt

Closing old verified.