linux-kernel - Re: Revert c5ad33184354260be6d05de57e46a5498692f6d6 "mm/swap.c: flush lru pvecs on compound page arrival" from stable tree? Was:[osstest-admin@...project.org: [Xen-devel] [linux-4.1 bisection] complete test-amd64-i386-qemut-rhel6hvm-amd]

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Date:	Thu, 21 Jul 2016 16:23:28 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Ian Jackson <ian.jackson@...citrix.com>
Cc:	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Odzioba, Lukasz" <lukasz.odzioba@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
	"david.vrabel@...rix.com" <david.vrabel@...rix.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Sebastian Gottschall <s.gottschall@...wrt.com>
Subject: Re: Revert c5ad33184354260be6d05de57e46a5498692f6d6 "mm/swap.c:
 flush lru pvecs on compound page arrival" from stable tree?
 Was:[osstest-admin@...project.org: [Xen-devel] [linux-4.1 bisection]
 complete test-amd64-i386-qemut-rhel6hvm-amd]

On Thu 21-07-16 13:45:40, Ian Jackson wrote:
> I see that linux-4.1.y is still at 5880876e9469 which has the serious
> bug introduced by the backport c5ad33184354 "mm/swap.c: flush lru
> pvecs on compound page arrival".
> 
> The analogous problem is also still affecting at least linux-3.18.y.
> 
> Is there some problem with reverting this patch in the stable
> branches ?

Sasha has mentioned he queued up the follow up fix. I am not sure who is
the 3.18 maintainer but he should do the same.

I am slightly worried that Sasha's email is bouncing for several days
and I am not sure who is his backup. For the time being I would just
suggest doing a local revert or apply Steven's patch from
http://www.spinics.net/lists/stable/msg138760.html
-- 
Michal Hocko
SUSE Labs