Re: kernel BUG in munlock_vma_pages_range

[Vlastimil Babka]

On 12/09/2013 06:05 PM, Sasha Levin wrote:
> On 12/09/2013 04:34 AM, Vlastimil Babka wrote:
> > Hello, I will look at it, thanks.
> > Do you have specific reproduction instructions?
>
> Not really, the fuzzer hit it once and I've been unable to trigger it again. Looking at
> the piece of code involved it might have had something to do with hugetlbfs, so I'll crank
> up testing on that part.

Thanks. Do you have trinity log and the .config file? I'm currently 
unable to even boot linux-next with my config/setup due to a GPF.
Looking at code I wouldn't expect that it could encounter a tail page, 
without first encountering a head page and skipping the whole huge page. 
At least in THP case, as TLB pages should be split when a vma is split. 
As for hugetlbfs, it should be skipped for mlock/munlock operations 
completely. One of these assumptions is probably failing here...

Vlastimil

> Thanks,
> Sasha

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