Open about 4 glxgears windows and start moving them around on an IVB system. With compiz the system will start showing "GPU hang" messages in about 30s. After a few minutes it hangs. Without compiz it takes about two minutes for the message and hangs are infrequent.
Please do attach the full dmesg and i915_error_state.
Created attachment 54359 [details]
Created attachment 54360 [details]
Created attachment 54361 [details]
*** This bug has been marked as a duplicate of bug 38862 ***