Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752576AbaKQT7h (ORCPT ); Mon, 17 Nov 2014 14:59:37 -0500 Received: from mail-vc0-f179.google.com ([209.85.220.179]:59693 "EHLO mail-vc0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751541AbaKQT7g (ORCPT ); Mon, 17 Nov 2014 14:59:36 -0500 MIME-Version: 1.0 In-Reply-To: <20141117170359.GA1382@redhat.com> References: <20141114213124.GB3344@redhat.com> <20141115213405.GA31971@redhat.com> <20141116014006.GA5016@redhat.com> <20141117170359.GA1382@redhat.com> Date: Mon, 17 Nov 2014 11:59:34 -0800 X-Google-Sender-Auth: 4qogXnN532Ph5Ra8enEWktFsMJ8 Message-ID: Subject: Re: frequent lockups in 3.18rc4 From: Linus Torvalds To: Dave Jones , Linus Torvalds , Linux Kernel , "the arch/x86 maintainers" 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 Mon, Nov 17, 2014 at 9:03 AM, Dave Jones wrote: > > It could a completely different cause for lockup, but seeing this now > has me wondering if perhaps it's something unrelated to the kernel. > I have recollection of running late .17rc's for days without incident, > and I'm pretty sure .17 was ok too. But a few weeks ago I did upgrade > that test box to the Fedora 21 beta. Which means I have a new gcc. > I'm not sure I really trust 4.9.1 yet, so maybe I'll see if I can > get 4.8 back on there and see if that's any better. I'm not sure if I should be relieved or horrified. Horrified, I think. It really would be a wonderful thing to have some kind of "compiler bisection" with mixed object files to see exactly which file it miscompiles (and by "miscompiles" it might just be a kernel bug where we are missing a barrier or something, and older gcc's just happened to not show it - so it could still easily be a kernel problem). 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/