Comment 7 for bug 947544

Multiple apps are getting a segfault in brw_update_renderbuffer_surface, including VLC, Compiz and Gazebo (which uses OGRE).

Ubuntu bug is reported here with a number of stack traces:

https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/947544

I'll attach a complete, more recent one in a moment, but the head looks like this:

#0 brw_update_renderbuffer_surface (brw=0x403eb30, rb=0x4510500, unit=0) at brw_wm_surface_state.c:1109
#1 0x00007fffdc0e9ab0 in brw_update_renderbuffer_surfaces (brw=0x403eb30) at brw_wm_surface_state.c:1205
#2 0x00007fffdc0d3b02 in brw_upload_state (brw=brw@entry=0x403eb30) at brw_state_upload.c:498
#3 0x00007fffdc0c11a7 in brw_try_draw_prims (max_index=4294967295, min_index=4294952344, ib=<optimised out>,
    nr_prims=<optimised out>, prim=0x7fffffffc580, arrays=<optimised out>, ctx=0x403eb30) at brw_draw.c:493
#4 brw_draw_prims (ctx=0x403eb30, prim=0x7fffffffc580, nr_prims=<optimised out>, ib=<optimised out>,
    index_bounds_valid=<optimised out>, min_index=4294967295, max_index=4294967295, tfb_vertcount=0x0) at brw_draw.c:589
#5 0x00007fffd73a43da in vbo_handle_primitive_restart (ctx=<optimised out>, prim=<optimised out>, nr_prims=<optimised out>,
    ib=<optimised out>, index_bounds_valid=<optimised out>, min_index=<optimised out>, max_index=4294967295)
    at ../../../../../src/mesa/vbo/vbo_exec_array.c:570
#6 0x00007fffd73a53b4 in vbo_validated_drawrangeelements (ctx=ctx@entry=0x403eb30, mode=mode@entry=4,
    index_bounds_valid=index_bounds_valid@entry=0 '\000', start=start@entry=4294967295, end=end@entry=4294967295,
    count=count@entry=39690, type=type@entry=5123, indices=indices@entry=0x0, basevertex=basevertex@entry=0,
    numInstances=numInstances@entry=1, baseInstance=baseInstance@entry=0) at ../../../../../src/mesa/vbo/vbo_exec_array.c:867
#7 0x00007fffd73a5724 in vbo_exec_DrawElements (mode=4, count=39690, type=5123, indices=0x0)
    at ../../../../../src/mesa/vbo/vbo_exec_array.c:997
#8 0x00007fffd4c05124 in Ogre::GLRenderSystem::_render(Ogre::RenderOperation const&) ()
   from /usr/lib/x86_64-linux-gnu/OGRE-1.7.4/RenderSystem_GL.so