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SubjectRe: mmap: is default non-populating behavior stable?
> (Every year or so we do wonder whether to change an extending mremap
> of a MAP_SHARED|MAP_ANONYMOUS object to extend the object itself instead
> of just SIGBUSing on the extension: but I've so far remained conservative
> about that, and Eugene appears to be thinking of more ordinary files.)

Try an mremap of a VM_GROWS* mapping and all the other things of this
nature. I would say our current behaviour is not what might be expected
by users. The extending an object case is just one example of weird


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