Martin Panter added the comment:

Here is a patch. The same problem happens with getset descriptors:

>>> del sys.stdout._CHUNK_SIZE
SystemError: null argument to internal routine

So I also changed the documentation for “setter” descriptor functions and the 
tp_descr_set() method.

I only looked at the Python 3 implementation, and I understand Python 2 objects 
work differently in some cases, so I’m not sure if my changes are apropriate 
for Python 2.

----------
keywords: +patch
nosy: +martin.panter
stage: needs patch -> patch review
Added file: http://bugs.python.org/file41143/setattr.patch

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