The latest 10.6 mesa drivers are causing Ubuntu 14.4 to freeze when running the WebGL Conformance Test version 1.0.2. It's crashing at the WebGL GLSL conformance test: sin_001_to_006.html My video card is an ATI X1300.

Both Chrome and Firefox will trigger the bug. Tested with both the stable and nightly FF builds. The test locks the system so hard that even the Magic SysRq key sequence doesn't work. Have to hard power down the system. Reverting back to the default 10.2 drivers fixes the issue.

Can you bisect Mesa?

Yes, I was able to bisect it down to this commit:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=6fcb5520b78cdf1e5013c125501932315a069955

last good commit:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=b7186ebea996072ed519ebae3fac8210941ce607


Marek,
Do you know why this would crash my system so badly?

Could you please attach the output of:

RADEON_DEBUG=vp,fp

You can use RADEON_NOOP=1 to disable command submission, so your machine won't hang, but it won't draw anything either.

Created attachment 114626 [details]
Log file

Result of 
$ export RADEON_DEBUG=vp,fp
$ firefox > FFlog.txt 2>&1

It still crashed my system, but did it record what you need?

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