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Good to see it translates into something logical : ) > > So I guess I am correct, if we can find two VMAs (except at the edge of the high addr boundary) > with a gap of greater than MAP_CHUNK_SIZE then there is a bug in mmap(). No haha, not at all!! Firstly fixed addressed override a lot of this, secondly the 256 page gap (which is configurable btw) is only applicable for mappings below a stack (in stack grow down arch). This assumption is totally incorrect, sorry. I'd suggest making assertions about this is really not all that useful, as things vary by arch and kernel configuration.