[issue27122] Hang with contextlib.ExitStack and subprocess.Popen (regression)

[STINNER Victor]

STINNER Victor added the comment:

> The loop seems to be in PyErr_SetObject in a loop that recursively go through PyException_GetContext.

We should also fix this function to avoid the infinite loop.

Maybe we should deny setting "exc.__context__=exc" (modify PyException_SetContext for that). Maybe raise a new RuntimeError in this case?

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<http://bugs.python.org/issue27122>
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