linux-kernel - Re: /proc/kcore has a unreasonable size(281474974617600) in x86

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Message-ID: <20090605075614.GC8171@cr0.nay.redhat.com>
Date:	Fri, 5 Jun 2009 15:56:14 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Tao Ma <tao.ma@...cle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64
	2.6.30-rc8.

On Fri, Jun 05, 2009 at 02:59:46PM +0800, Tao Ma wrote:
>
>
> Andrew Morton wrote:
>> On Fri, 05 Jun 2009 12:03:52 +0800 Tao Ma <tao.ma@...cle.com> wrote:
>>
>>> Hi list,
>>>        In 2.6.30-rc8, /proc/kcore in x86_64's size is unreasonable 
>>> large to be 281474974617600.
>>> While in a x86 box, it is 931131392 which looks sane.
>>>
>>> [root@...t8 ~]# ll /proc/kcore
>>> -r-------- 1 root root 281474974617600 Jun  5 11:15 /proc/kcore
>>>
>>> [root@...s2-test9 ~]$ ll /proc/kcore
>>> -r-------- 1 root root 931131392 Jun  5 11:58 /proc/kcore
>>>
>>> I just noticed this when kexec fails in "Can't find kernel text map 
>>> area from kcore".
>>>
>>> Is there something wrong?
>>>
>>
>> fs/proc/kcore.c hasn't changed since October last year.  Was 2.6.29 OK?
>> Earlier kernels?
> with 2.6.29, ls shows the same output.
> [root@...t8 ~]# ll /proc/kcore
> -r-------- 1 root root 281474974617600 Jun  5 14:35 /proc/kcore


Thanks.

It looks like the value of 'high_memory' is insane.. 

Can you get its value on your machine? You can add a printk() or use
systemtap etc..
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