Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965396AbaGPP1r (ORCPT ); Wed, 16 Jul 2014 11:27:47 -0400 Received: from casper.infradead.org ([85.118.1.10]:35562 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933938AbaGPP1q (ORCPT ); Wed, 16 Jul 2014 11:27:46 -0400 Date: Wed, 16 Jul 2014 17:27:36 +0200 From: Peter Zijlstra To: Greg Donald Cc: linux-kernel@vger.kernel.org, Ingo Molnar Subject: Re: find_busiest_group divide error Message-ID: <20140716152736.GD19379@twins.programming.kicks-ass.net> References: <20140714165659.GA9289@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="B2GzrzFQbYDXIsTK" Content-Disposition: inline In-Reply-To: <20140714165659.GA9289@gmail.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --B2GzrzFQbYDXIsTK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jul 14, 2014 at 11:56:59AM -0500, Greg Donald wrote: >=20 > [1.] One line summary of the problem: >=20 > find_busiest_group divide error >=20 > [2.] Full description of the problem/report: >=20 > Around June 7th I found I could no longer boot a mainline kernel. I > posted about it here on June 9th: >=20 > http://lists.kernelnewbies.org/pipermail/kernelnewbies/2014-June/010914.h= tml >=20 > I bisected two complete times but never got to a commit that made any > sense: >=20 > https://bugzilla.kernel.org/show_bug.cgi?id=3D77711 >=20 > I see a lot of kernel/sched/fair.c patching appeared in mainline on June > 5th: >=20 > https://github.com/torvalds/linux/commits/master/kernel/sched/fair.c >=20 > So I tried checking out specific revisions and found > 09dc4ab03936df5c5aa711d27c81283c6d09f495 is the latest good revision I > can boot. The first bad revision I hit is > 51f2176d74ace4c3f58579a605ef5a9720befb00. >=20 > I have no idea how to fix it. I'm just a web developer/kernel tester :( >=20 Could you confirm if reverting caffcdd8d27ba78730d5540396ce72ad022aff2c cures things for you? Otherwise there's two very similar issues, see also: lkml.kernel.org/r/20140716145546.GA6922@wolff.to --B2GzrzFQbYDXIsTK Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJTxpnjAAoJEHZH4aRLwOS6wbsP/jshM/iKjvB08N/ccPgBZpto WTCF9ATAPw3/juX/zqrOVuWPtMM05xBBjxJOIN4s02+AFXupXw3S7Fyy6RtgfIh0 gRIl6tDi2OO7fapF2W27pCKE7gVxrp1Hlkf1rdkSxTdp2P0xejwIw8h68bOz5zgH leOQdZjDGaPzhhvkB9zbFyml90/0PipBZS574FulTbO7s/manG0dZKBvqSQ8Bk8i 8HQS8Or6114HqGCrO079FqtGoaDjZC0ns0TjvNaqVJKEg/fIedq1mBgZyHcgZ5Di c6XulTA6sTMQTzTcS8WeVSXDjlKPVtjNETf28AJdlxuANqmM8wLf/RQsq93jLRn6 3i68Xe6z90uFea/zoYipX6VpQ6urLtFjtH6APU6XKW7JEgZZ4J2veEybmwBH/ULZ +kVDc8/A8+3Gsduh5em6uLFx2s1XhU9yXAd6dtIpqmafhidWqQLzNZUkKaS+Ry4x LftqJVYNMGBPTFhSjNExaBXn7O3N8YgqWWp1z7XzV60IahDF4K/7ouifObzgqnrk 3hiInZ5oQgeFAfFy7YzBWQGux2d6waQcQigdYWQ+ZvNksV97yY2o8EK8X6oB/T3K 7jTXD7NiTA+c9EazHXGIwvGhahRtqrDs375+XCKAH6d+dJL5rBZlGd2SQUjzwm3b TKVJkidTPsZv7qb7Bbsx =45SO -----END PGP SIGNATURE----- --B2GzrzFQbYDXIsTK-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/