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

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

> My argument is the loop creation should be prevented at first place.

I agree, but avoiding the hang is higher priority.

> Preventing creation of the loop will fix all other code that iterate the __context__ chain.

There could still be a cycles involving both __context__ and __cause__ links. This is why the traceback code uses a visited set to detect cycles.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25782>
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