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

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Message-ID: <20090605054902.GF7962@cr0.nay.redhat.com>
Date:	Fri, 5 Jun 2009 13:49:02 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Tao Ma <tao.ma@...cle.com>
Cc:	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 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.

>
> 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?

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