[Bug 37253] New: SIGSEGV in dri2FlushFrontBuffer/MakeContextCurrent

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37253

           Summary: SIGSEGV in dri2FlushFrontBuffer/MakeContextCurrent
           Product: Mesa
           Version: unspecified
          Platform: Other
               URL: https://bugzilla.mozilla.org/show_bug.cgi?id=624935
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: bjacob at mozilla.com


This is the bug forcing us to blacklist Gallium in Firefox 6+.

Steps to reproduce:

0. This has been confirmed with Mesa 7.10.2, Gallium 0.4, and both R300 and
R600 but seems device-independent. I didn't find the proper category for
general Gallium bugs.
1. Grab a Nightly of Firefox:
   http://nightly.mozilla.org/
2. Run it; If you're already using Firefox, you may want to do:
   ./path/to/firefox -no-remote -P
3. Make sure that WebGL is enabled (a bug in parsing version strings makes it
unintentionally blacklist some systems). Go to about:config, set
webgl.force-enabled=true if needed. You can go to about:support to check WebGL
status.
4. Go to http://people.mozilla.com/~sicking/webgl/ray.html

Actual results: segfault

A stack trace is given there:
  https://bugzilla.mozilla.org/show_bug.cgi?id=624935#c0

I discussed this with Corbin Simpson
(https://bugzilla.mozilla.org/show_bug.cgi?id=624935#c6) who told me it was a
known Gallium bug, been discussed on the mailing list already:
http://marc.info/?l=mesa3d-dev&m=126525088903956&w=2
http://marc.info/?l=mesa3d-dev&m=127680073328903&w=2

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