mesa3d-dev

[Mesa3d-dev] [Bug 25994] [i915][GLSL] 'return' statement in vertex shader may cause GPU hang

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=25994


Constantin Baranov <co...@mi...> changed:

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                 CC|                            |mesa3d-
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--- Comment #10 from Constantin Baranov <co...@mi...>  2010-01-17 15:03:02 PST ---
Bug is alive with the latest git versions of libdrm and mesa (w/o gallium).
I doubt about true location of the bug, so I'm CC'ing mesa developers.


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[Mesa3d-dev] [Bug 25994] [i915][GLSL] 'return' statement in vertex shader may cause GPU hang

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=25994





--- Comment #11 from Constantin Baranov <co...@mi...>  2010-01-29 14:05:11 PST ---
Created an attachment (id=32915)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32915)
Mortal fragment shader

A fragment shader with 'discard' statement also kills GPU.
Discarding the 'discard' line in this source will save GPU.


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[Mesa3d-dev] [Bug 25994] [i915][GLSL] 'return' statement in vertex shader may cause GPU hang

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=25994





--- Comment #12 from Loose Vladimir <wol...@mi...>  2010-01-29 15:16:53 PST ---
Mortal fragment shader posted by Constantin Baranov reproduces bug on my
hardware (see above), causes gpu hung and in most cases X server crash. Without
'discard' line works fine.


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[Mesa3d-dev] [Bug 25994] [i915][GLSL] 'return' statement in vertex shader may cause GPU hang

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=25994


Jesse Barnes <jb...@vi...> changed:

           What    |Removed                     |Added
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         AssignedTo|jb...@vi...    |id...@fr...




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[Mesa3d-dev] [Bug 25994] [i915][GLSL] 'return' statement in vertex shader may cause GPU hang

[<bug...@fr...>]

http://bugs.freedesktop.org/show_bug.cgi?id=25994





--- Comment #13 from Loose Vladimir <wol...@mi...>  2010-03-21 08:51:23 PST ---
Happy to say, someone with nickname pino had looked at this bug report and
tested shader.c and Mortal fragment shader on his hardware:

Chipset: GM45
System architecture: x86
xserver-xorg-video-intel 2.6.3
xserver 1.7.4
mesa 7.4
libdrm 2.4.5
kernel 2.6.28-11-generic 
Linux distribution: Ubuntu 9.04
Machine: Lenovo G550 model 20023
Display connector: LVDS

As he said, he haven't encountered any bugs during Mortal fragment shader test. 

shader.c with "#if 0" causes X server crash and GPU hang.


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