(In reply to comment #6)
> BTW I've found another bug (failing assertion in mesa core on debug builds)
> when replaying your trace file (attachment 93670 [details]).
> see bug 74723

After the fix in c325ec896545cc909f2f0e359f0bb0513a8a53b5 I don't get any
assertion with --enable-debug, only these messages:

669: glDebugOutputCallback: High severity Shader Compiler unknown issue 1,
0:2(12): warning: extension `GL_EXT_gpu_shader4' unsupported in geometry shader
673: glDebugOutputCallback: High severity Shader Compiler unknown issue 2,
0:2(12): warning: extension `GL_EXT_gpu_shader4' unsupported in fragment shader