Mark Shannon added the comment:

There are two parts to this fix.

First, we raise a runtime exception if the other dict is modified during the 
update/merge.
Second, refcounts must be incremented around the PyDict_GetItem and insertdict 
calls in case the key or value is otherwise deallocated.
 
Patch attached.

----------
keywords: +patch
Added file: http://bugs.python.org/file39860/24407.patch

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