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

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Message-ID: <4A28B63E.1080004@oracle.com>
Date:	Fri, 05 Jun 2009 14:07:58 +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 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.
> 
>> 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.

Regards,
Tao
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