linux-kernel - Re: 2.6.28.10 - kernel BUG at mm/rmap.c:725

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Date:	Fri, 25 Dec 2009 12:56:36 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	CoolCold <coolthecold@...il.com>
Cc:	Linux kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	hugh.dickins@...cali.co.uk
Subject: Re: 2.6.28.10 - kernel BUG at mm/rmap.c:725

On Thu, Dec 24, 2009 at 7:09 PM, CoolCold <coolthecold@...il.com> wrote:
> 3 days ago LA on server become very high and it was working very
> strange, so was rebooted. There are such entryies in log about kernel
> bug - kernel BUG at mm/rmap.c:725! . Googling didn't provide me with
> exact answer is it bug or hardware problems, something similar was
> here https://bugs.launchpad.net/ubuntu/+source/linux/+bug/252977/comments/56
> In general this server had number of unexpected stalls during several
> months, but there is no ipkvm, so i can't say where something on
> console or not. Hope you will help.
>
> Kernel version is 2.6.28.10 , self-builded. System - Debian stable/testing.
>
> Please reply to me directly, cuz i'm not subsribed to list.
>
> Dec 21 22:05:01 gamma kernel: Eeek! page_mapcount(page) went negative! (-1)
> Dec 21 22:05:01 gamma kernel:   page pfn = 1f2c81
> Dec 21 22:05:01 gamma kernel:   page->flags = 20000000008007c
> Dec 21 22:05:01 gamma kernel:   page->count = 2
> Dec 21 22:05:01 gamma kernel:   page->mapping = ffff8801fd870b58
> Dec 21 22:05:01 gamma kernel:   vma->vm_ops = 0xffffffff80535020
> Dec 21 22:05:01 gamma kernel:   vma->vm_ops->fault = shmem_fault+0x0/0x69
> Dec 21 22:05:01 gamma kernel:   vma->vm_file->f_op->mmap = shmem_mmap+0x0/0x2e
> Dec 21 22:05:01 gamma kernel: ------------[ cut here ]------------
> Dec 21 22:05:01 gamma kernel: kernel BUG at mm/rmap.c:725!

Hey,

commit 3dc147414cc already removed this BUG(), not sure
how serious this is...

Adding mm people into Cc.

Thanks.
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