[issue25782] CPython hangs on error __context__ set to the error itself

[Jack O'Connor]

Jack O'Connor added the comment:

Yury, do we need to handle more complicated infinite loops, where "self" doesn't actually show up in the loop? Here's an example:

    try:
        raise Exception
    except Exception as ex:
        loop1 = Exception()
        loop2 = Exception()
        loop1.__context__ = loop2
        loop2.__context__ = loop1
        ex.__context__ = loop1
        hasattr(1, 'aa')

I'm unfamiliar with CPython, so I don't know whether full-blown loop detection belongs here. Maybe we could add a hardcoded limit like "fail if we loop more than X times"?

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nosy: +oconnor663

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<http://bugs.python.org/issue25782>
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