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    SubjectRe: mm/rmap.c negative page map count BUG.
    Octavio Alvarez Piza <alvarezp@alvarezp.ods.org> 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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