Serhiy Storchaka added the comment:

There is a problem with this patch. Py_XDECREF can execute arbitrary Python 
code and this code can call set_panel_userptr. Here is a reproducer (it causes 
segfault).

----------
resolution: fixed -> 
stage: committed/rejected -> commit review
status: closed -> open
Added file: http://bugs.python.org/file30606/userptr-segfault.py

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<http://bugs.python.org/issue18113>
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