No python developer has access to AIX AFAIK.  So you will likely need to debug this problem yourself or provide access to an AIX box.  Here are some questions to get you started:

 * Does this problem happen as a 32-bit exe rather than 64-bit?
 * Did you use xlc, gcc, or some other compiler?
 * What happens if you switch compilers?
 * Does this happen if you disable optimization? 
 * What happens if you build a debug version of python (./configure --with-pydebug)?
 * Do you have any memory debugging tool that you can use to track this down?

It looks like there is a problem derefencing a function pointer.  I don't know why that might happen.