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

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Date:	Wed, 2 May 2007 13:07:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Greg KH <gregkh@...e.de>, Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: 2.6.21-rc7-mm2 crash: Eeek! page_mapcount(page) went negative!
 (-1)

On Wed, 02 May 2007 19:36:03 +0200
Tilman Schmidt <tilman@...p.cc> wrote:

> Am 02.05.2007 09:52 schrieb Greg KH:
> > Tilman, here's a patch, can you try this on top of your tree that dies?
> 
> 2.6.21-git3 plus that patch comes up fine.
> 
> (Except for a UDP problem I seem to remember I already saw reported
> on lkml and which I'll ignore for now in order not to blur the
> picture.)

Thanks.

> Started to git-bisect mainline now, but that will take some time.
> It's more than 800 patches to check and I don't get more than 2-3
> iterations per day out of that machine.

I don't think there's much point in you doing that.  We know what the bug is.

Switching to 8k stacks will probably fix things up too.
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