From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754409Ab0IPPM5 (ORCPT ); Thu, 16 Sep 2010 11:12:57 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:48294 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752266Ab0IPPM4 (ORCPT ); Thu, 16 Sep 2010 11:12:56 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: paulmck@linux.vnet.ibm.com Cc: Subrata Modak , linux-kernel , Peter Zijlstra , Li Zefan , Linuxppc-dev , sachinp , DIVYA PRAKASH Subject: Re: 2.6.35-stable/ppc64/p7: suspicious rcu_dereference_check() usage detected during 2.6.35-stable boot In-Reply-To: Your message of "Mon, 09 Aug 2010 09:12:00 PDT." <20100809161200.GC3026@linux.vnet.ibm.com> From: Valdis.Kletnieks@vt.edu References: <1280739132.15317.9.camel@subratamodak.linux.ibm.com> <20100809161200.GC3026@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1284649951_6055P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Thu, 16 Sep 2010 11:12:31 -0400 Message-ID: <10430.1284649951@localhost> X-Mirapoint-Received-SPF: 128.173.14.107 localhost Valdis.Kletnieks@vt.edu 2 pass X-Mirapoint-IP-Reputation: reputation=neutral-1, source=Fixed, refid=n/a, actions=MAILHURDLE SPF TAG X-Junkmail-Status: score=10/50, host=dagger.cc.vt.edu X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A020205.4C9233E0.0043,ss=1,fgs=0, ip=0.0.0.0, so=2009-09-22 00:05:22, dmn=2009-09-10 00:05:08, mode=single engine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1284649951_6055P Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable On Mon, 09 Aug 2010 09:12:00 PDT, =22Paul E. McKenney=22 said: > On Mon, Aug 02, 2010 at 02:22:12PM +0530, Subrata Modak wrote: > > Hi, > > > > The following suspicious rcu_dereference_check() usage is detected > > during 2.6.35-stable boot on my ppc64/p7 machine: > > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D > > =5B INFO: suspicious rcu_dereference_check() usage. =5D > > --------------------------------------------------- > > kernel/sched.c:616 invoked rcu_dereference_check() without protection= =21 > > other info that might help us debug this: > Thank you for locating this one=21 This looks like the same issue that= > Ilia Mirkin located. Please see below for my analysis -- no fix yet, > as I need confirmation from cgroups experts. I can easily create a > patch that suppresses the warning, but I don't yet know whether this is= > the right thing to do. Ping? I just hit it on 2.6.36-rc4-mmotm0915. Just wanted to make sure t= he issue hadn't been lost/forgotten. --==_Exmh_1284649951_6055P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFMkjPfcC3lWbTT17ARAuvZAKCh4ydqf/ApMNSrY0b1/RMlnA6ucQCg6awG qG+TLw5VQ8RKFcRb7NP0F3A= =R13/ -----END PGP SIGNATURE----- --==_Exmh_1284649951_6055P--