linux-kernel - Re: getting oom/stalls for ltp test cpuset01 with latest/4.9 kernel

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Date:   Tue, 17 Jan 2017 09:13:09 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Ganapatrao Kulkarni <gpkulkarni@...il.com>
Cc:     Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: getting oom/stalls for ltp test cpuset01 with latest/4.9 kernel

On 01/16/2017 02:22 PM, Vlastimil Babka wrote:
>>>
>>>  no_zone:
>>> --
>>> 2.11.0
>>>
>>
>> this patch did not fix the issue.
>> issue still exists!
> 
> Hmm, that's unfortunate.
> 
>> i did bisect and this test passes in 4.4,4.5 and 4.6
>> test failing since 4.7-rc1
> 
> 4.7 would match the commit I was trying to fix. But I don't see other
> problems now. Could you bisect to a single commit then, to be sure? Thanks.

Ah, nevermind, I can reproduce the issue easily. After some more poking
I now think the bisect would lead to the OOM rework, but it would be a
red herring. Seems like this is an interaction between bind mempolicy
and cpuset and I see several potential bugs in that area. Which also
means there's a non-null nodemask and thus the code in the commit I
originally suspected (replacing NULL nodemask with cpuset's
mems_allowed) doesn't trigger at all here.

Thanks,
Vlastimil

>> thanks
>> Ganapat
>>>
>>>
>>>
> 
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