linux-kernel - Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free

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Date:   Tue, 22 Nov 2016 17:14:02 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Marc MERLIN <marc@...lins.org>
Cc:     linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Tejun Heo <tj@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of
 RAM that should be free

On 11/22/2016 05:06 PM, Marc MERLIN wrote:
> On Mon, Nov 21, 2016 at 01:56:39PM -0800, Marc MERLIN wrote:
>> On Mon, Nov 21, 2016 at 10:50:20PM +0100, Vlastimil Babka wrote:
>>>> 4.9rc5 however seems to be doing better, and is still running after 18
>>>> hours. However, I got a few page allocation failures as per below, but the
>>>> system seems to recover.
>>>> Vlastimil, do you want me to continue the copy on 4.9 (may take 3-5 days) 
>>>> or is that good enough, and i should go back to 4.8.8 with that patch applied?
>>>> https://marc.info/?l=linux-mm&m=147423605024993
>>>
>>> Hi, I think it's enough for 4.9 for now and I would appreciate trying
>>> 4.8 with that patch, yeah.
>>
>> So the good news is that it's been running for almost 5H and so far so good.
> 
> And the better news is that the copy is still going strong, 4.4TB and
> going. So 4.8.8 is fixed with that one single patch as far as I'm
> concerned.
> 
> So thanks for that, looks good to me to merge.

Thanks a lot for the testing. So what do we do now about 4.8? (4.7 is
already EOL AFAICS).

- send the patch [1] as 4.8-only stable. Greg won't like that, I expect.
  - alternatively a simpler (againm 4.8-only) patch that just outright
prevents OOM for 0 < order < costly, as Michal already suggested.
- backport 10+ compaction patches to 4.8 stable
- something else?

Michal? Linus?

[1] https://marc.info/?l=linux-mm&m=147423605024993

> Marc
>