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


    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..


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