Hi guys, 

First, thanks for the prompt replies. 

@matrixise: If there is i can't find it, but i am happy to accept it as a possibility. Equally, maybe there is an assumption about memory in the cpython implementation somewhere that goes against my memory allocator -> this is obviously not cpythons fault. The point of this 'issue' is to ask the community to suggest how i can go about finding where the problem is. As i said, there is a lot of code :)

@pablogsal: Yeah. I had a look in there. In cpython, i have made all allocations from obmalloc use my memory allocation functions, including the arenas. 

Perhaps a starting point would be if anyone has ideas about how to go about debugging this??

best, 

Paul