From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752786AbdBMLxU (ORCPT ); Mon, 13 Feb 2017 06:53:20 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:53868 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751679AbdBMLxT (ORCPT ); Mon, 13 Feb 2017 06:53:19 -0500 Date: Mon, 13 Feb 2017 12:53:14 +0100 From: Pavel Machek To: lkml@pengaru.com Cc: Thomas Gleixner , Woody Suwalski , "Rafael J. Wysocki" , kernel list , mingo@redhat.com, hpa@zytor.com Subject: Re: 4.10-rc1: thinkpad x60: who ate my cpu? Message-ID: <20170213115314.GA16933@amd> References: <20170114113054.GA22012@amd> <20170115095656.GA16524@amd> <1614c21c-3626-074e-e3c3-26e9cd200454@gmail.com> <3c3d35ac-e4e4-6a6c-a78e-b0478ff39726@gmail.com> <20170212195742.GA6264@amd> <161a3edb-84f1-769d-d8e9-04102ddbbe58@gmail.com> <20170213080215.GA3730@amd> <20170213094236.GA2924@amd> <20170213101851.GX3712@shells.gnugeneration.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="45Z9DzgjV8m4Oswq" Content-Disposition: inline In-Reply-To: <20170213101851.GX3712@shells.gnugeneration.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --45Z9DzgjV8m4Oswq Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon 2017-02-13 04:18:51, lkml@pengaru.com wrote: > On Mon, Feb 13, 2017 at 10:42:36AM +0100, Pavel Machek wrote: > > Hi! > >=20 > > On Mon 2017-02-13 09:48:41, Thomas Gleixner wrote: > > > On Mon, 13 Feb 2017, Pavel Machek wrote: > > > > cd /sys/devices/system/cpu/cpu1 > > > > while true; do echo 0 > online; echo 1 > online; done > > > >=20 > > > > ...crashes x60 with 4.10-rc in few minutes. [Which is bad -- it sho= uld > > > > not die, but also good -- this is easier to reproduce then running = 100 > > > > suspend cycles.] > > >=20 > > > Can you tell where it crashes? > >=20 > > I did not expect a crash, so I was in X... I have a feeling that this > > will be reproducible on a lot of hardware, but let me try. >=20 > FYI: Lockup reproduced with 4.10.0-rc7 with an X61s. >=20 > Caught a glimpse of something about an RCU stall timeout before the syste= m shut > off. Prior to that, during the loop execution, a bunch of systemd proces= ses > were experiencing watchdog timeouts, and procps `top` would start but > never refresh, leaving the CPU column all "nan". Hmm. I was not able to reproduce the lockup when I was running "while true" over ssh. Some weird stuff happened when I suspended machine with that loop running, but... I guess that was expected. Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --45Z9DzgjV8m4Oswq Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlihnioACgkQMOfwapXb+vIXlwCeJ7rk+blJ0y6Oxh/oSCV+1AZt p6kAoKQgHWFrBByAm0KZ2I28U/RY9lZv =Sy2W -----END PGP SIGNATURE----- --45Z9DzgjV8m4Oswq--