How can I debug (potentially C-library related) memory issues using 64-bit Python on Windows?

I've found the tools discussed here very helpful: http://mg.pov.lt/blog/hunting-python-memleaks.html.

I had a similar sort of problem tracking down a severe memory leak in a numpy/scipy heavy code where none of the usual Python memory management tools and diagnostics detected the leak or hinted at its source.

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