I managed to make this crash happen by loading up the computer with memory-intensive processes and then running the test script provided by the original poster repeatedly.  The crash report seems to indicate an attempt to dereference a NULL pointer somewhere in the bz2 library, but I haven't had time to dig any further to find out where this happens (I'm guessing a memory allocation call is missing a follow-up NULL check).  

This was done with a standard install of 2.5 on a Windows XP Media Edition laptop.  I'll post more when I get time to play with this again.