Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933022AbaGWSzo (ORCPT ); Wed, 23 Jul 2014 14:55:44 -0400 Received: from mail-vc0-f181.google.com ([209.85.220.181]:60203 "EHLO mail-vc0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932557AbaGWSzn (ORCPT ); Wed, 23 Jul 2014 14:55:43 -0400 MIME-Version: 1.0 In-Reply-To: <20140723184111.GG3935@laptop> References: <20140723113021.GP12054@laptop.lan> <20140723142454.GQ12054@laptop.lan> <20140723155526.GW3935@laptop> <20140723170324.GZ3935@laptop> <20140723182518.GD3935@laptop> <20140723184111.GG3935@laptop> Date: Wed, 23 Jul 2014 11:55:42 -0700 X-Google-Sender-Auth: f0wnmGp_Ca9Dgv4HRAAbz5s7cEE Message-ID: Subject: Re: Random panic in load_balance() with 3.16-rc From: Linus Torvalds To: Peter Zijlstra Cc: Dietmar Eggemann , =?UTF-8?Q?Michel_D=C3=A4nzer?= , Ingo Molnar , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 23, 2014 at 11:41 AM, Peter Zijlstra wrote: > > OK, that leaves us agreeing we want to clean that up, but still no > closer to explaining WTH happened on Michel's machine. Weird that. So looking at that destination pointer value (ffff10043c803e8c), it *looks* like a pointer. Almost. If it was 0xffff80.. instead of 0xffff10.. it would probably be a fine pointer. Can you send me the config? I'm wondering what else might be close to that load_balance_mask percpu allocation, that migth perhaps have overflowed and written a stray byte into the pointer or something? Linus -- 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/