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

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Message-ID: <Pine.LNX.4.64.0704282300080.2223@blonde.wat.veritas.com>
Date:	Sat, 28 Apr 2007 23:06:21 +0100 (BST)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Tilman Schmidt <tilman@...p.cc>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative!
 (-1)

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.

Hugh
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