Comment # 56 on bug 80419 from David Beswick

Hi, I have an apitrace that hopefully shows the problem. It's 17GB at the
moment -- if someone would like to give me some pointers on cutting it down or
where to upload it then I can do that.

OpenGL core profile version string: 3.3 (Core Profile) Mesa 11.1.0-devel
(git-511a863 2015-09-26 vivid-oibaf-ppa)

I'll continue testing and may generate further traces.