Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756441Ab2ESKUw (ORCPT ); Sat, 19 May 2012 06:20:52 -0400 Received: from mail-wg0-f44.google.com ([74.125.82.44]:38558 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755607Ab2ESKUt (ORCPT ); Sat, 19 May 2012 06:20:49 -0400 Date: Sat, 19 May 2012 12:20:41 +0200 From: Ingo Molnar To: Josh Boyer Cc: "H. Peter Anvin" , "H.J. Lu" , Ingo Molnar , Linus Torvalds , Greg KH , Linux Kernel Mailing List , Jarkko Sakkinen Subject: Re: Urgent: x86-32 and GNU ld 2.22.52.0.1 Message-ID: <20120519102041.GA22271@gmail.com> References: <4FB67146.9080804@zytor.com> <4FB676E0.9070206@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1760 Lines: 43 * Josh Boyer wrote: > On Fri, May 18, 2012 at 12:20 PM, H. Peter Anvin wrote: > > On 05/18/2012 09:14 AM, H.J. Lu wrote: > >> On Fri, May 18, 2012 at 8:56 AM, H. Peter Anvin wrote: > >>> I need an urgent opinion. ?It seems we have an epic mess on our hands. > >>> > >>> GNU ld 2.22.52.0.1 silently changed the semantics of section-relative > >>> symbols that are part of otherwise empty sections, and silently changes > >>> them to absolute. ?We rely on section-relative symbols staying > >>> section-relative, and actually have several sections in the linker > >>> script solely for this purpose. > >> > >> That is I talked to you a couple days ago: > >> > >> http://sourceware.org/bugzilla/show_bug.cgi?id=14052 > >> > > > > I know, which was a very good thing... otherwise we'd probably not have > > tracked this down anywhere near as quickly. ?Thank you. > > > > The problem is that this version of binutils made it into Fedora 17, and > > so we now have a large number of users with a known bad binutils in the > > field... > > We've not seen many kernel bugs that would seem to be blamed > on this as of yet. It does seem like a problem waiting to hit > us once F17 goes GA though. My limited 32-bit F17 machine > collection definitely shows the __init_{begin,end} symbols > being absolute, but they boot fine. Likely because the kernel > isn't relocated on them. Relocation is rare, it typically happens with crashdump kernels. Thanks, Ingo -- 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/