Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752741AbaG1M2g (ORCPT ); Mon, 28 Jul 2014 08:28:36 -0400 Received: from mx1.redhat.com ([209.132.183.28]:2052 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751664AbaG1M2e (ORCPT ); Mon, 28 Jul 2014 08:28:34 -0400 To: Linus Torvalds Cc: Markus Trippelsdorf , Steven Rostedt , Alexei Starovoitov , =?us-ascii?Q?=3D=3FUTF-8=3FQ=3FMichel=5FD=3DC3=3DA4nzer=3F=3D?= , Jakub Jelinek , Linux Kernel Mailing List , Debian GCC Maintainers , Debian Kernel Team Subject: Re: Random panic in load_balance() with 3.16-rc References: <53D064C7.5050807@daenzer.net> <53D1B1EF.7030603@daenzer.net> <20140725035527.GA30108@pg-vmw-gw1> <20140725140237.GB32669@home.goodmis.org> <20140726193557.GA21842@x4> <20140726201914.GB21842@x4> From: fche@redhat.com (Frank Ch. Eigler) Date: Mon, 28 Jul 2014 08:26:59 -0400 In-Reply-To: (Linus Torvalds's message of "Sat, 26 Jul 2014 13:39:54 -0700") Message-ID: User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org torvalds wrote: > [...] > Actually, I prefer my patch that did it with cc-option checking, and > does it unconditionally. > > Because if we do it even for non-debug builds - where it ostensibly > shouldn't matter - we then have that GCC_COMPARE_DEBUG thing working > regardless of configuration. Please note that the data produced by "-g -fvar-tracking" is consumed by tools like systemtap, perf, crash, and makes a significant difference to the observability of debug AND non-debug kernels. (The presence of compiled-in DEBUG_* self-checking code is orthogonal to kernel observability via debuginfo.) Please consider only disabling var-tracking optionally/temporarily to work around this already-fixed compiler bug, but not losing high-quality dwarf data permanently. - FChE -- 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/