Armin Rigo added the comment:

We're finding such bugs because we are trying to reimplement ctypes in PyPy.

I guess your last question was "is it impossible to construct this 'bug'
without *reading* .contents?".  The answer is that it doesn't change
much; you can replace all the reads from .contents with reads from [0],
and still see the issue.  See attached y.py, where I've put the
equivalent C code in comments.

Added file: http://bugs.python.org/file9438/y.py

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