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From: Hugh Dickins <hugh@veritas.com>
To: John Heil <kerndev@sc-software.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Bug: 2.6.24-smp: Eeek! page_mapcount(page) went negative! (-1)
Date: Wed, 6 Feb 2008 19:55:36 +0000 (GMT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802061948380.32204@blonde.site> (raw)
In-Reply-To: <Pine.LNX.4.64.0802061003370.4601@sc-software.com>

On Wed, 6 Feb 2008, kerndev@sc-software.com wrote:
> 
> Before digging into this myself (don't really have enought time),
> I thought I'd submit it here...

Thanks for the report.

> Feb  6 09:09:47 sc-software kernel: Eeek! page_mapcount(page) went negative!

These very often turn out the be due to bad RAM or some such:
worth running memtest86+ overnight when you can, though its
success wouldn't be conclusive.

> (-1)
> Feb  6 09:09:47 sc-software kernel:   page pfn = 12b1b1
> Feb  6 09:09:47 sc-software kernel:   page->flags = 80080014
> Feb  6 09:09:47 sc-software kernel:   page->count = 0

That's a free page which shouldn't have appeared in the pagetable.
It could be that there's a bit error somewhere in that pfn of 12b1b1.

> Feb  6 09:09:47 sc-software kernel:   page->mapping = 00000000
> Feb  6 09:09:47 sc-software kernel:   vma->vm_ops = 0x0
> Feb  6 09:09:47 sc-software kernel: ------------[ cut here ]------------
> Feb  6 09:09:47 sc-software kernel: kernel BUG at mm/rmap.c:631!
> Feb  6 09:09:47 sc-software kernel: invalid opcode: 0000 [#2] PREEMPT SMP
> Feb  6 09:09:47 sc-software kernel: Modules linked in: shpchp pci_hotplug
> ohci1394 ieee1394
> Feb  6 09:09:47 sc-software kernel:
> Feb  6 09:09:47 sc-software kernel: Pid: 3710, comm: X Tainted: G      D

But that [#2] and that D taint both say there was already a problem
before this: anything showing in the log for that?

Hugh

  reply	other threads:[~2008-02-06 19:56 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-06 18:13 kerndev
2008-02-06 19:55 ` Hugh Dickins [this message]
2008-02-06 20:21   ` kerndev
2008-02-06 20:33     ` Pekka Enberg
2008-02-06 20:38       ` kerndev

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