Re: /proc/kcore has a unreasonable size(281474974617600) in x86_64 2.6.30-rc8.

Tao Ma
2009-06-05T07:00:11Z

Andrew Morton wrote:
> On Fri, 05 Jun 2009 12:03:52 +0800 Tao Ma <tao.ma@oracle.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@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

But the kexec works.

I just checked .28, the same as .29.

Regards,
Tao