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SubjectRe: kernel BUG in munlock_vma_pages_range
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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