Re: [Bug] Reproducible data corruption on i5-3340M: Please revert53a59fc67!

[Michal Hocko]

On Thu 15-08-13 16:46:00, Michal Hocko wrote:
> On Thu 15-08-13 15:40:31, Michal Hocko wrote:
> > On Thu 15-08-13 05:02:31, Linus Torvalds wrote:
> > > On Thu, Aug 15, 2013 at 2:25 AM, Ben Tebulin <tebulin@xxxxxxxxxxxxxx> wrote:
> > > >
> > > > I just cherry-picked e6c495a96ce0 into 3.9.11 and 3.7.10.
> > > > Unfortunately this does _not resolve_ my issue (too good to be true) :-(
> > > 
> > > Ho humm. I've found at least one other bug, but that one only affects
> > > hugepages. Do you perhaps have transparent hugepages enabled? But even
> > > then it looks quite unlikely.
> > 
> > __unmap_hugepage_range is hugetlb not THP if you had that one in mind.
> > And yes, it doesn't set the range which sounds buggy.
> 
> Or, did you mean tlb_remove_page called from zap_huge_pmd? That one
> should be safe as tlb_remove_pmd_tlb_entry sets need_flush and that
> means that the full range is flushed.

Dohh... But we need need_flush_all and that is not set here. So this
really looks buggy.

-- 
Michal Hocko
SUSE Labs
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