Created attachment 95393 [details]
kern.log

All I do is start NS2, the loading screen comes up but eventually it goes blank
(DPMS save).  Then it may come back and go away several times before usually
crashing back to desktop. 

Crashes with LXDE/Unity
mesa: Stock Ubuntu 14.04 and git (oibaf ppa).
kernels: Stock Ubuntu 14.04 (3.13) and 3.14-rc5 and .

Kern log includes with stock Ubuntu 14.04 at booting at Mar  8 22:38:19
The one where it reset a lot booting at Mar  8 15:00:19, was w/ LXDE, it kept
resetting.

Also reported to launchpad here (In this case it crashed compiz as well):
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1289860