Re: 2.6.28-rc3 mem_cgroup panic

[Badari Pulavarty]

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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