Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative!(-1)

From: Hugh Dickins
Date: Sat Apr 28 2007 - 18:06:53 EST

On Sat, 28 Apr 2007, Andrew Morton wrote:
> It seems wildly screwed up that we have a PageReserved() page with a pfn of
> zero (!) which claims to be in a reiserfs mapping, only it isn't attached
> to a reiserfs file. How the heck did that happen?

It's "simply" that it somehow got a spurious page table entry 00000001.
Great that it's so reproducible, I take that to mean this one is not
bad RAM. Your request for a bisection is just what we want, thanks.

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