Re: [Xen-devel] Regression due to "mm/swap.c: flush lru pvecs on compound page arrival"

[Michal Hocko <mhocko@xxxxxxxxxx>]

On Wed 14-12-16 13:29:56, Ian Jackson wrote:
> osstest service owner writes ("[linux-3.18 bisection] complete 
> test-amd64-amd64-xl-qemut-win7-amd64"):
> > *** Found and reproduced problem changeset ***
> > 
> >   Bug is in tree:  linux 
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> >   Bug introduced:  a2d8c514753276394d68414f563591f174ef86cb
> >   Bug not present: 8f620446135b64ca6f96cf32066a76d64e79a388
> >   Last fail repro: http://logs.test-lab.xenproject.org/osstest/logs/103315/
> > 
> >   commit a2d8c514753276394d68414f563591f174ef86cb
> >   Author: Lukasz Odzioba <lukasz.odzioba@xxxxxxxxx>
> >   Date:   Fri Jun 24 14:50:01 2016 -0700
> >   
> >       mm/swap.c: flush lru pvecs on compound page arrival
> 
> This commit breaks the test "test-amd64-amd64-xl-qemut-win7-amd64" in
> the Xen Project CI system.

Ohh, I can see it now. This is not an upstream commit. This is a 3.18.37
backport which was wrong! You need the follow up fix 52c84a95dc6a
("4.1.28 Fix bad backport of 8f182270dfec "mm/swap.c: flush lru pvecs on
compound page arrival""). The primary problem was that __lru_cache_add
has leaked pages which would explain your OOM.
-- 
Michal Hocko
SUSE Labs

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