From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754736Ab3AMEOJ (ORCPT ); Sat, 12 Jan 2013 23:14:09 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:57893 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754583Ab3AMEOH (ORCPT ); Sat, 12 Jan 2013 23:14:07 -0500 Message-ID: <1358050431.4514.57.camel@deadeye.wl.decadent.org.uk> Subject: Re: INFO: rcu_bh detected stall on CPU 3 (t=0 jiffies) From: Ben Hutchings To: Steven Rostedt Cc: paulmck@linux.vnet.ibm.com, linux-kernel@vger.kernel.org Date: Sun, 13 Jan 2013 04:13:51 +0000 In-Reply-To: <1357174163.10284.8.camel@gandalf.local.home> References: <20130102190920.GD29452@charite.de> <20130102205630.GA5594@home.goodmis.org> <20130102212948.GA25701@linux.vnet.ibm.com> <1357174163.10284.8.camel@gandalf.local.home> Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-2uGM+KPxiV04/f+BddX/" X-Mailer: Evolution 3.4.4-1 Mime-Version: 1.0 X-SA-Exim-Connect-IP: 2001:470:1f08:1539:21c:bfff:fe03:f805 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-2uGM+KPxiV04/f+BddX/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2013-01-02 at 19:49 -0500, Steven Rostedt wrote: > On Wed, 2013-01-02 at 13:29 -0800, Paul E. McKenney wrote: > > On Wed, Jan 02, 2013 at 03:56:30PM -0500, Steven Rostedt wrote: > > > On Wed, Jan 02, 2013 at 08:09:20PM +0100, Ralf Hildebrandt wrote: > > > > This happened of a virtual guest (Linux mail 3.2.0-35-virtual #55-U= buntu SMP Wed Dec 5 18:02:05 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux) > > >=20 > > > 3.2 is rather old and this looks to be a stock Ubuntu kernel. May wan= t > > > to file a Bugzilla (or whatever they call it) with them. > > >=20 > > > >=20 > > > > Jan 2 13:24:08 mail kernel: [3531872.484283] INFO: rcu_bh detected= stall on CPU 3 (t=3D0 jiffies) > > >=20 > > > 0 jiffies? > >=20 > > One possibility is that they are missing commit a10d206e (rcu: Fix > > day-one dyntick-idle stall-warning bug), at least assuming that > > CONFIG_PREEMPT=3Dn. This went into 3.6, IIRC. >=20 > If that does fix the issue, we probably should send that off to Ben for > inclusion into 3.2 stable. If I read the Ubuntu changelog correctly, Ralf's machine is running a version based on 3.2.34, which already has this change (I applied it in 3.2.32). Ben. --=20 Ben Hutchings Klipstein's 4th Law of Prototyping and Production: A fail-safe circuit will destroy others= . --=-2uGM+KPxiV04/f+BddX/ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIVAwUAUPI0f+e/yOyVhhEJAQq8QxAAtlj2De1+fN2ZPSBFpya8ng7TSAwPigNO b0XfYYJgJoCPdS4NxmwRRTUtF1ZQpHhYWK9aAh/lPEYHhCsqq7tdZG5+ZevKmLLi wvPeH69ec26+biVJQbIcfNzap2MumRbA74jkKWpWicwphcVRxEDf0Xi7wtmnlkex rIDY6Jtw/3bHS5Dh2b67QIsRN+SDLnwFuUmqMP6UuY5m1X5LfnnVZ4k47hWha8AU CbA52vXmIdXFSiGdMrGEGpuICaiE4fhdIITvp+o1IjDhd59moUwIsVE0zBtb4nTr PO3kFxlvS+M3by/tzt2vyxrtQHUNecLergruDErsIdwIF8Z74ImOEyIkQ75Us6Pz xmD6l9igQIZKawYwVmOzDh5k9i5udk4moY7K9cRDvl03tzpWfcZZKtVPE9G+uCnf aY75ywAFsBJDPnt5Nmt1YxEE6MkoLDswrOtYAt4YwPBQdF58O7Q2MDLjxUnqzlmD 29/Av/Z5WhXQplSbIRYHh9v93VtBpoFGJL6Y47gKKsFugz0sRIG0q8YgyPnMWOQn Y0xQGZFVxbK3+u22h5uRdmWNsKbMRqB+Q6V/LrnRFITaWLz1Gf8rdEMCrbaRjo3t h9XXm9rVhboYK5qbI0MNkFVzlly9+J0xR9h0A94atjzHekdCyPK755/0VJaaMUDr mSmTMoA3Vv4= =BdDG -----END PGP SIGNATURE----- --=-2uGM+KPxiV04/f+BddX/--