[issue21435] Segfault with cyclic reference and asyncio.Future

[Tim Peters]

Tim Peters added the comment:

xxx.py provokes a closely related death on my box, in a debug build (where 0xdbdbdbdb happened to be an invalid memory address).  There are no imports so asyncio is definitely off the hook ;-)

The code is senseless, and changing just about anything makes the problem go away.  As mentioned before, provoking this class of error relies on all sorts of implementation accidents to get the internal gc lists into just the right state to fail.

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Added file: http://bugs.python.org/file35182/xxx.py

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