Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753668AbYHYAtT (ORCPT ); Sun, 24 Aug 2008 20:49:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752683AbYHYAtG (ORCPT ); Sun, 24 Aug 2008 20:49:06 -0400 Received: from gate.crashing.org ([63.228.1.57]:36389 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751731AbYHYAtF (ORCPT ); Sun, 24 Aug 2008 20:49:05 -0400 Subject: Re: 2.6.27-rc4-git1: Reported regressions from 2.6.26 From: Benjamin Herrenschmidt Reply-To: benh@kernel.crashing.org To: "Rafael J. Wysocki" Cc: Linux Kernel Mailing List , Adrian Bunk , Andrew Morton , Linus Torvalds , Natalie Protasevich , Kernel Testers List In-Reply-To: References: Content-Type: text/plain Date: Mon, 25 Aug 2008 10:48:21 +1000 Message-Id: <1219625301.13162.2.camel@pasglop> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1002 Lines: 26 > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=11414 > Subject : Random crashes with 2.6.27-rc3 on PPC > Submitter : Michael Buesch > Date : 2008-08-23 14:10 (1 days old) > References : http://marc.info/?l=linux-kernel&m=121950076812616&w=4 This appears to be a gcc bug when -fno-omit-stack-pointer is used (which we mostly don't need on ppc anyway except that another gcc stupidity makes it mandatory for -pg which ftrace needs). We're working on a two fold workaround: removing -fno-omit-stack-pointer in all the cases where we don't really need it, and for when we do (ie, CONFIG_FTRACE becaues of -pg), using -mno-sched-epilog which seems to work around it. The root cause in gcc hasn't been fully identified yet. Ben. -- 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/