On Wed, Aug 29, Andrew Cooper wrote: > Architecturally speaking, handing #MC back is probably the closest we > can get to sensible behaviour, but it is still a bug that Linux is > touching the ballooned out page in the first place.
Well, the issue is that a read crosses a page boundary. If that would be forbidden, load_unaligned_zeropad() would not exist. It can not know what is in the following page. And such page crossing happens also in the unballooned case. Sadly I can not trigger the reported NFS bug myself. But it can be enforced by ballooning enough pages so that an allocated readdir reply eventually is right in front of a ballooned page. Olaf
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