Literally just walking around in the first few seconds of a new-world spawn, looking around (total play time probably around 20-60 seconds).
Then the screen went blank, pause for a few seconds, then came up with the crash-summary display, also pointing to the (attached) crash-report text file.
Environment
Covered in attached crash report text file, but anyway:
Linux (i386) version 3.1.0-1-686-pae
Java version: 1.6.0_26
Duplicate of MC-502.