2012/6/7 Uwe F. Mayer <uwe_f_mayer@yahoo.com>
Currently the Cygwin Pypy Python standalone version build with --opt=jit fails on os.fork() calls.

fork() on Windows... I'm surprised it works at all!

You should probably read this page:
http://cygwin.com/cygwin-ug-net/highlights.html#ov-hi-process
specially the "DLL base address collisions", did you run rebaseall?
Is pypy linked with some non-cygwin load-time DLLs?

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Amaury Forgeot d'Arc