"the process will get killed when first writing to the page in case of memory pressure."

According to the documentation, the returned shared array is zeroed. https://docs.python.org/3.4/library/multiprocessing.html#module-multiprocessing.sharedctypes

In that case because the entire array is written at allocation, the process is expected to get killed if allocating more memory than available. Unless I am misunderstanding something, which is entirely possible.