I'm not so familiar with other operating systems, but on Linux and presumably other unixes, the only thing holding back the initial/main "process stack" is ulim

I'm not so familiar with other operating systems, but on Linux and presumably other unixes, the only thing holding back the initial/main "process stack" is ulimit. Try "ulimit -s unlimited". (On macOS that increases it from 8MB to 64MB, but on linux it seems to really go unlimited)