Tim Mitchell added the comment:

Here is my patch for parts 3 and 4.
Core issue for part 4 appears to be dk_lookup calling arbitrary python code may 
free the key.
dk_lookup is also used in _PyDict_LoadGlobal not sure if this bug can occur 
here.

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nosy: +Tim Mitchell
Added file: 
http://bugs.python.org/file44587/0001-Issue-27945-Fixed-segfaults-in-dict.fromkeys-when-it.patch

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