The failing test is launching a subprocess to compile python code, waiting for the subprocess to exit, and then checking to see if the file was created.  So the timing issue would appear to be that the file created by the subprocess doesn't appear to exist to the main program even after the subprocess has exited.  Stefan, Jesus, do either of you know of anything about the file systems used on your buildbots that might give rise to this problem?  Is there some sort of file system sync call we need to make to make sure different processes have the same view of the file system?

However, if my theory is true I would expect that other tests in test_compileall would also fail randomly.  Does anyone know if it is always test_regexp?