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    SubjectRe: 2.6.28-rc3 mem_cgroup panic
    KAMEZAWA Hiroyuki wrote:
    > KAMEZAWA Hiroyuki said:
    >
    >> Badari Pulavarty said:
    >>
    >>> Hi Balbir,
    >>>
    >>> I was running memory remove/add tests in a continuous loop.
    >>> I get following panic in mem_cgroup migration code.
    >>>
    >>> Is this a known issue ?
    >>>
    >>>
    >> No, this is new one. We don't see panic in cpuset based migration..so..
    >> Maybe related to page_cgroup allocation/free code in memory hotplug
    >> notifier.
    >>
    >> Thank you for report. I'll try this.
    >>
    >>
    > Hmm...at quick look...
    >
    > online/offline page_cgroup's calculation for "start" is buggy..
    >
    > -start = start_pfn & (PAGES_PER_SECTION - 1);
    > +start = start_pfn & ~(PAGES_PER_SECTION - 1);
    >
    > I'm sorry I can't write patch today.
    >
    > Regards,
    > -Kame
    >
    >

    Thanks for the fix. Tests are running fine now.

    Thanks,
    Badari




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