https://bugs.freedesktop.org/show_bug.cgi?id=81644
--- Comment #58 from Aaron B aaronbottegal@gmail.com --- I would also like to add, if this happens three times in quick succession (Have chrome running with an OpenGL game starting/Level loading in a game) it'll sometimes have 3 quick fail and recovers. If it does happen 3 times in a row, X dies and it throws up a few "Couldn't schedule IB" with possibly a previous "Still active IB in BO." or two to the kernel log. This is pretty rare, but about one out of every 5 crashes when I'm starting a game and Chromium/Mesa fail to start the OpenGL app will fail in such a manner, although it has also happened with just Chromium, but that is much more rare.