Created attachment 95296 [details] error state running this demo results in firefox crashing and GPU hang/reset in dmesg: http://people.mozilla.org/~sicking/webgl/ray.html unigine-crypt does the same running drm-intel-nightly from yesterday, mesa git master as of today
I can confirm both of these hangs. We have a couple of Piglit tests with very similar looking hangs as well.
Linux kvm 3.13.0-20-generic #42-Ubuntu SMP Fri Mar 28 09:56:33 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Desktop OpenGL core profile version string: 3.1 (Core Profile) Mesa 10.1.0 OpenGL core profile shading language version string: 1.40 OpenGL core profile context flags: (none) OpenGL core profile extensions: [ 7119.744742] [drm] stuck on render ring [ 7119.744748] [drm] GPU crash dump saved to /sys/class/drm/card0/error [ 7119.744749] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [ 7119.744750] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [ 7119.744751] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [ 7119.744752] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. [ 7119.747933] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x3de17000 ctx 3) at 0x3de18140 [ 7125.764317] [drm] stuck on render ring [ 7125.784470] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x28936000 ctx 1) at 0x289362c0
Should be fixed by: http://article.gmane.org/gmane.comp.video.mesa3d.devel/77713
(In reply to comment #2) > Linux kvm 3.13.0-20-generic #42-Ubuntu SMP Fri Mar 28 09:56:33 UTC 2014 > x86_64 x86_64 x86_64 GNU/Linux > > OpenGL vendor string: Intel Open Source Technology Center > OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Desktop Not related. Create a new bug.
Fixed by: commit 9584959123b0453cf5313722357e3abb9f736aa7 Author: Kenneth Graunke <kenneth@whitecape.org> Date: Thu May 8 16:44:37 2014 -0700 i965: Fix GPU hangs on Broadwell in shaders with some control flow. According to the documentation, we need to set the source 0 register type to IMM for flow control instructions that have both JIP and UIP. Fixes GPU hangs in approximately 10 Piglit tests, 5 es3conform tests, Unigine Crypt, a WebGL raytracer demo, and several Steam titles.
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