On 12/09/2013 12:12 PM, Vlastimil Babka wrote:
> 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...

I've attached my .config, I don't keep trinity logs because they bloat/slow down the testing too 
much (I'm usually testing in vms with 64 or over vcpus).

Thanks,
Sasha