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Date:	Fri, 05 Jun 2009 14:56:36 +0800
From:	Tao Ma <tao.ma@...cle.com>
To:	Amerigo Wang <xiyou.wangcong@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64
 2.6.30-rc8.



Amerigo Wang wrote:
> On Fri, Jun 05, 2009 at 02:07:58PM +0800, Tao Ma wrote:
>>
>> Amerigo Wang wrote:
>>> On Fri, Jun 05, 2009 at 12:03:52PM +0800, Tao Ma 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
>>> Hmm, what is your physical RAM size on test8?
>>> /proc/kcore looks fine on my x86_64 box.
>> Only 4G.
> 
> Hmm, my x86_box has 8G mem, the size of kcore looks much
> saner than the above huge number, but it is still wrong
> according to what the man page describes...
> 
> Please do what Andrew said, it will be helpful.
> 
>>>> I just noticed this when kexec fails in "Can't find kernel text map 
>>>> area  from kcore".
>>>>
>>>> Is there something wrong?
>>> It looks like that error message is from userspace?
>> I just started kdump and get the error message.
> 
> IIRC, kdump should use /proc/vmcore, instead of /proc/kcore...
> nothing related.
in el5, when start kdump service it will do something like
/sbin/kexec --args-linux -p '--command-line=ro root=LABEL=/ rhgb quiet 
irqpoll maxcpus=1' --initrd=/boot/initrd-2.6.18-53.el5kdump.img 
/boot/vmlinuz-2.6.18-53.el5

And the error message is from there.

Regards,
Tao
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