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SubjectRe: mm/rmap.c negative page map count BUG.
Octavio Alvarez Piza <> wrote:
> > That means page->_mapcount contained 0xfffeffff when it should have
> > contained 0xffffffff. A single bit got cleared. Probably bad memory,
> > overheating, something of that kind.
> BTW, what's the first 8 in flags:0x80010008? I can't find 1<<31 in
> include/linux/page-flags.h

That's the page's zone identifier. We stuff that into the high bits of
page->flags for page_zone().
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