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Message-ID: <1567699853.5576.98.camel@lca.pw>
Subject: Re: [RFC PATCH] mm, oom: disable dump_tasks by default
From: Qian Cai <cai@lca.pw>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, Tetsuo
 Handa <penguin-kernel@I-love.SAKURA.ne.jp>, David Rientjes
 <rientjes@google.com>,  LKML <linux-kernel@vger.kernel.org>
Date: Thu, 05 Sep 2019 12:10:53 -0400
In-Reply-To: <20190903151307.GZ14028@dhcp22.suse.cz>
References: <20190903144512.9374-1-mhocko@kernel.org>
	 <1567522966.5576.51.camel@lca.pw> <20190903151307.GZ14028@dhcp22.suse.cz>
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On Tue, 2019-09-03 at 17:13 +0200, Michal Hocko wrote:
> On Tue 03-09-19 11:02:46, Qian Cai wrote:
> > On Tue, 2019-09-03 at 16:45 +0200, Michal Hocko wrote:
> > > From: Michal Hocko <mhocko@suse.com>
> > >=20
> > > dump_tasks has been introduced by quite some time ago fef1bdd68c81
> > > ("oom: add sysctl to enable task memory dump"). It's primary purpos=
e is
> > > to help analyse oom victim selection decision. This has been certai=
nly
> > > useful at times when the heuristic to chose a victim was much more
> > > volatile. Since a63d83f427fb ("oom: badness heuristic rewrite")
> > > situation became much more stable (mostly because the only selectio=
n
> > > criterion is the memory usage) and reports about a wrong process to
> > > be shot down have become effectively non-existent.
> >=20
> > Well, I still see OOM sometimes kills wrong processes like ssh, syste=
md
> > processes while LTP OOM tests with staight-forward allocation pattern=
s.
>=20
> Please report those. Most cases I have seen so far just turned out to
> work as expected and memory hogs just used oom_score_adj or similar.

Here is the one where oom01 should be one to be killed.

[92598.855697][ T2588] Swap cache stats: add 105240923, delete 105250445,=
 find
42196/101577
[92598.893970][ T2588] Free swap=C2=A0=C2=A0=3D 16383612kB
[92598.913482][ T2588] Total swap =3D 16465916kB
[92598.932938][ T2588] 7275091 pages RAM
[92598.950212][ T2588] 0 pages HighMem/MovableOnly
[92598.971539][ T2588] 1315554 pages reserved
[92598.990698][ T2588] 16384 pages cma reserved
[92599.010760][ T2588] Tasks state (memory values in pages):
[92599.036265][ T2588] [=C2=A0=C2=A0pid=C2=A0=C2=A0]=C2=A0=C2=A0=C2=A0uid=
=C2=A0=C2=A0tgid total_vm=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0rss pgtables=
_bytes
swapents oom_score_adj name
[92599.080129][ T2588]
[=C2=A0=C2=A0=C2=A01662]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A01662=C2=
=A0=C2=A0=C2=A0=C2=A029511=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01034=C2=A0=C2=A0=C2=
=A0290816=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0244=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 systemd-
journal
[92599.126163][ T2588]
[=C2=A0=C2=A0=C2=A02586]=C2=A0=C2=A0=C2=A0998=C2=A0=C2=A02586=C2=A0=C2=A0=
=C2=A0508086=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A0=
=C2=A0368640=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01838=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 polkitd
[92599.168706][ T2588]
[=C2=A0=C2=A0=C2=A02587]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02587=C2=
=A0=C2=A0=C2=A0=C2=A052786=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0421888=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0500=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 ss=
sd
[92599.210082][ T2588]
[=C2=A0=C2=A0=C2=A02588]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02588=C2=
=A0=C2=A0=C2=A0=C2=A031223=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0139264=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0195=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
irqbalance
[92599.255606][ T2588]
[=C2=A0=C2=A0=C2=A02589]=C2=A0=C2=A0=C2=A0=C2=A081=C2=A0=C2=A02589=C2=A0=C2=
=A0=C2=A0=C2=A018381=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=
=C2=A0=C2=A0167936=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0217=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-900 dbus-
daemon
[92599.303678][ T2588]
[=C2=A0=C2=A0=C2=A02590]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02590=C2=
=A0=C2=A0=C2=A0=C2=A097260=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0193=C2=A0=C2=
=A0=C2=A0372736=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0573=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
NetworkManager
[92599.348957][ T2588]
[=C2=A0=C2=A0=C2=A02594]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02594=C2=
=A0=C2=A0=C2=A0=C2=A095350=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
1=C2=A0=C2=A0=C2=A0229376=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0758=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 rn=
gd
[92599.390216][ T2588]
[=C2=A0=C2=A0=C2=A02598]=C2=A0=C2=A0=C2=A0995=C2=A0=C2=A02598=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A07364=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=
=A0=C2=A0=C2=A0=C2=A094208=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0103=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 ch=
ronyd
[92599.432447][ T2588]
[=C2=A0=C2=A0=C2=A02629]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02629=C2=
=A0=C2=A0=C2=A0106234=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0399=C2=A0=C2=A0=C2=
=A0442368=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03836=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 tuned
[92599.473950][ T2588]
[=C2=A0=C2=A0=C2=A02638]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02638=C2=
=A0=C2=A0=C2=A0=C2=A023604=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0212992=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0240=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-1000 sshd
[92599.515158][ T2588]
[=C2=A0=C2=A0=C2=A02642]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02642=C2=
=A0=C2=A0=C2=A0=C2=A010392=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0102400=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0138=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
rhsmcertd
[92599.560435][ T2588]
[=C2=A0=C2=A0=C2=A02691]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02691=C2=
=A0=C2=A0=C2=A0=C2=A021877=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0208896=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0277=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 sy=
stemd-
logind
[92599.605035][ T2588]
[=C2=A0=C2=A0=C2=A02700]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02700=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A03916=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A00=C2=A0=C2=A0=C2=A0=C2=A069632=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A045=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A00 agetty
[92599.646750][ T2588]
[=C2=A0=C2=A0=C2=A02705]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02705=C2=
=A0=C2=A0=C2=A0=C2=A023370=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0225280=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0393=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 sy=
stemd
[92599.688063][ T2588]
[=C2=A0=C2=A0=C2=A02730]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02730=C2=
=A0=C2=A0=C2=A0=C2=A037063=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0294912=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0667=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 (s=
d-pam)
[92599.729028][ T2588]
[=C2=A0=C2=A0=C2=A02922]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A02922=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A09020=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A00=C2=A0=C2=A0=C2=A0=C2=A098304=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02=
32=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A00 crond
[92599.769130][ T2588]
[=C2=A0=C2=A0=C2=A03036]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A03036=C2=
=A0=C2=A0=C2=A0=C2=A037797=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
1=C2=A0=C2=A0=C2=A0307200=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0305=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 ss=
hd
[92599.813768][ T2588]
[=C2=A0=C2=A0=C2=A03057]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A03057=C2=
=A0=C2=A0=C2=A0=C2=A037797=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
0=C2=A0=C2=A0=C2=A0303104=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0335=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 ss=
hd
[92599.853450][ T2588]
[=C2=A0=C2=A0=C2=A03065]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=C2=A0=C2=A03065=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A06343=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A01=C2=A0=C2=A0=C2=A0=C2=A086016=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A01=
63=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A00 bash
[92599.892899][ T2588] [=C2=A0=C2=A038249]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
38249=C2=A0=C2=A0=C2=A0=C2=A058330=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0293=
=C2=A0=C2=A0=C2=A0221184=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0246=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00 rsysl=
ogd
[92599.934457][ T2588] [=C2=A0=C2=A011329]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
11329=C2=A0=C2=A0=C2=A0=C2=A055131=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A073=C2=A0=C2=A0=C2=A0454656=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0396=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00=
 sssd_nss
[92599.976240][ T2588] [=C2=A0=C2=A011331]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
11331=C2=A0=C2=A0=C2=A0=C2=A054424=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A01=C2=A0=C2=A0=C2=A0434176=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0610=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A00 sssd_be
[92600.017106][ T2588] [=C2=A0=C2=A025247]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
25247=C2=A0=C2=A0=C2=A0=C2=A025746=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A01=C2=A0=C2=A0=C2=A0212992=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0300=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0-1000 systemd-udevd
[92600.060539][ T2588] [=C2=A0=C2=A025391]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
25391=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02184=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A065536=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A032=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A00 oom01
[92600.100648][ T2588] [=C2=A0=C2=A025392]=C2=A0=C2=A0=C2=A0=C2=A0=C2=A00
25392=C2=A0=C2=A0=C2=A0=C2=A0=C2=A02184=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A00=C2=A0=C2=A0=C2=A0=C2=A065536=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A039=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A00 oom01
[92600.143516][ T2588] oom-
kill:constraint=3DCONSTRAINT_NONE,nodemask=3D(null),cpuset=3D/,mems_allow=
ed=3D0-
1,global_oom,task_memcg=3D/system.slice/tuned.service,task=3Dtuned,pid=3D=
2629,uid=3D0
[92600.213724][ T2588] Out of memory: Killed process 2629 (tuned) total-
vm:424936kB, anon-rss:328kB, file-rss:1268kB, shmem-rss:0kB, UID:0
pgtables:442368kB oom_score_adj:0
[92600.297832][=C2=A0=C2=A0T305] oom_reaper: reaped process 2629 (tuned),=
 now anon-
rss:0kB, file-rss:0kB, shmem-rss:0kB


>=20
> > I just
> > have not had a chance to debug them fully. The situation could be wor=
se with
> > more complex allocations like random stress or fuzzy testing.