linux-kernel - Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected)

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Message-ID: <20170201101444.GJ5977@dhcp22.suse.cz>
Date:   Wed, 1 Feb 2017 11:14:44 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Trevor Cordes <trevor@...nopolis.ca>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: mm, vmscan: commit makes PAE kernel crash nightly (bisected)

On Wed 01-02-17 03:29:28, Trevor Cordes wrote:
> On 2017-01-30 Michal Hocko wrote:
[...]
> > Testing with Valinall rc6 released just yesterday would be a good fit.
> > There are some more fixes sitting on mmotm on top and maybe we want
> > some of them in finall 4.10. Anyway all those pending changes should
> > be merged in the next merge window - aka 4.11
> 
> After 30 hours of running vanilla 4.10.0-rc6, the box started to go
> bonkers at 3am, so vanilla does not fix the bug :-(  But, the bug hit
> differently this time, the box just bogged down like crazy and gave
> really weird top output.  Starting nano would take 10s, then would run
> full speed, then when saving a file would take 5s.  Starting any prog
> not in cache took equally as long.

Could you try with to_test/linus-tree/oom_hickups branch on the same git
tree? I have cherry-picked "mm, vmscan: consider eligible zones in
get_scan_count" which might be the missing part.

Thanks!
-- 
Michal Hocko
SUSE Labs