I've seen an argument for immediately execing and not marking the whole mutable process VA space as 'trap on write', including the thread stack that you're abou

I've seen an argument for immediately execing and not marking the whole mutable process VA space as 'trap on write', including the thread stack that you're about immediately write to if you're going to throw that work away and exec(). There's also 'I want support cheap forks on a nommu system and vforking is easier to retrofit in'.