[Bug 50980] New: [r300g, bisected] WebGL cars demo crash (r300_emit.c:865:r300_emit_vertex_arrays: Assertion `(buf)' failed)

[bugzilla-daemon@xxxxxxxxxxxxxxx]

https://bugs.freedesktop.org/show_bug.cgi?id=50980

             Bug #: 50980
           Summary: [r300g, bisected] WebGL cars demo crash
                    (r300_emit.c:865:r300_emit_vertex_arrays: Assertion
                    `(buf)' failed)
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: Other
               URL: http://www.chromeexperiments.com/detail/webgl-cars/?f=
                    webgl
        OS/Version: All
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@xxxxxxxxxxxxxxxxxxxxx
        ReportedBy: pavel.ondracka@xxxxxxxx
                CC: maraeo@xxxxxxxxx


Created attachment 62902
  --> https://bugs.freedesktop.org/attachment.cgi?id=62902
backtrace

WebGL cars demo crash with r300_emit.c:865:r300_emit_vertex_arrays: Assertion
`(buf)' failed, full backtrace attached.

784dd51198433e5c299da4a7742c68d21d68d1c1 is the first bad commit
commit 784dd51198433e5c299da4a7742c68d21d68d1c1
Author: Marek Olšák <maraeo@xxxxxxxxx>
Date:   Mon Apr 16 03:34:22 2012 +0200

    mesa,vbo: properly detect when vertex arrays need to be recalculated

    This moves the RebindArrays flag into the vbo module, consolidates the
code,
    and adds missing vbo_draw_method calls.

    Also with this change, the vertex arrays are not needlessly recalculated
twice.
    The issue with the old code was:
    - If recalculate_input_bindings updates vp_varying_inputs, _NEW_ARRAY is
set.
    - _mesa_update_state is called and the vp_varying_inputs change causes
      regeneration of the fixed-function shaders, which also sets _NEW_PROGRAM.
    - The occurence of either _NEW_ARRAY or _NEW_PROGRAM sets
      the recalculate_inputs flag to TRUE again.
    - The new code sets the flag to FALSE after the second _mesa_update_state,
      because there can't possibly be any change which would require
recalculating
      the arrays.

    Reviewed-by: Brian Paul <brianp@xxxxxxxxxx>
    Reviewed-by: Mathias Fröhlich <Mathias.Froehlich@xxxxxx>


GPU:RV530
Kernel: 3.4.0-1.fc17.i686
Firefox 13.0

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