https://bugs.freedesktop.org/show_bug.cgi?id=71067
--- Comment #8 from Christian König deathsimple@vodafone.de ---
nov. 02 09:16:44 leviathan kernel: Memory corruption detected in low memory
And directly after that the GPU gets into a reset loop. That indeed sounds like the system is somewhat broken.
Please also try 3.12, but I would rather advise to replace the hardware.