@ljs this is an image (though it is years out of date) of the main heap of some Chrome process: https://drive.google.com/file/d/1rI3mFhKzvE9L8C0szPJBJeuN-lq9XdYC/viewEvery line is 2MiB of virtual address space, and the barely visible dark stuff on the left and right is non-present PROT_NONE stuff