Re: /proc/kcore has a unreasonable size(281474974617600) in x86_642.6.30-rc8.

[Tao Ma]

Amerigo Wang wrote:
> 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@xxxxxxxxxx> 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@test8 ~]# ll /proc/kcore
> > > > -r-------- 1 root root 281474974617600 Jun  5 11:15 /proc/kcore
> > > >
> > > > [root@ocfs2-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@test8 ~]# 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..
Just did that.
Also a strange number.
high memory 18446612137615818752.

Regards,
Tao
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