Antoine Pitrou added the comment:

> Under very low memory condition, PyErr_NoMemory() or
> PyErr_NormalizeException() enters an unlimited loop when the free list 
> of MemoryError becomes empty.

The real question is why the free list becomes empty.

Either way, I don't think a read-only singleton is a good idea. It may be 
simpler to call Py_FatalError in such cases.

----------
nosy: +neologix

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<http://bugs.python.org/issue19835>
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