On Fri, Jun 8, 2012 at 1:15 PM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> On Fri, 8 Jun 2012, Andrew Morton wrote:
>
>> OK. I assume this bug has been there for quite some time.
>
> Well the huge pages refcount tricks caused the issue.
>
>> How serious is it? Have people been reporting it in real workloads?
>> How to trigger it? IOW, does this need -stable backporting?
>
> Possibly.
If this patch is getting back-ported then we shld also do same for
5bf5f03c271907978 (mm: fix slab->page flags corruption) which fixes
other issue related to slub and huge page sharing.
>
>> Also, someone forgot to document these:
>>
>> struct {
>> unsigned inuse:16;
>> unsigned objects:15;
>> unsigned frozen:1;
>> };
>
> So far I thouight that the field names are pretty clear on their own.
>
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