I updated Mesa to latest GIT and tried this again last night (Kokua viewer
3.6.12 x64). The result was even more catastrophic: As soon the world was to
begin rendering, the screen turned black and the monitor went in standby mode.
The numlock / capslock leds on the keyboard also stopped toggling. I had to
power off the computer to restart. This likely means a Kernel panic happened,
so the problem is probably really bad.