Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754607AbbGFQnh (ORCPT ); Mon, 6 Jul 2015 12:43:37 -0400 Received: from mail-wi0-f181.google.com ([209.85.212.181]:36701 "EHLO mail-wi0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753695AbbGFQnf (ORCPT ); Mon, 6 Jul 2015 12:43:35 -0400 Date: Mon, 6 Jul 2015 18:43:30 +0200 From: Ingo Molnar To: Sasha Levin Cc: Denys Vlasenko , linux-kernel@vger.kernel.org, Andy Lutomirski , Brian Gerst , Peter Zijlstra , Borislav Petkov , "H. Peter Anvin" , Linus Torvalds , Oleg Nesterov , Thomas Gleixner Subject: Re: [PATCH] x86/asm/entry/64: Clean up entry_64.S Message-ID: <20150706164330.GA24890@gmail.com> References: <1433752501-15901-1-git-send-email-mingo@kernel.org> <1433752501-15901-5-git-send-email-mingo@kernel.org> <5575954F.5070408@redhat.com> <20150608185106.GA28747@gmail.com> <559A9821.4010600@oracle.com> <20150706160737.GA6462@gmail.com> <559AAA7A.7080100@oracle.com> <20150706162359.GA16523@gmail.com> <559AAE8F.1050408@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <559AAE8F.1050408@oracle.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2517 Lines: 74 * Sasha Levin wrote: > On 07/06/2015 12:23 PM, Ingo Molnar wrote: > > > > * Sasha Levin wrote: > > > >> On 07/06/2015 12:07 PM, Ingo Molnar wrote: > >>> > >>> * Sasha Levin wrote: > >>> > >>>> Hey Ingo, > >>>> > >>>> I've started seeing the fuzzer hitting the BUG() at arch/x86/kernel/nmi.c:533. git > >>>> blame pointed to this patch. I know that you didn't see any changes in the compiled > >>>> file in your testcase, but I do see changes in mine. > >>> > >>> Hm, weird - could you send me your .config please? > >> > >> Attached. > > > > It's still weird: I copied your config to 4d7321381e5c and made 'make oldconfig' - > > and it asked a couple of questions, which suggests that your config does not come > > from 4d7321381e5c? > > Right, sorry, this is my base config for -next. I just did 'yes "" | make oldconfig' > for the build test. > > I've attached it. > > > Furthermore, building 4d7321381e5c and 4d7321381e5c^1 gives me: > > > > # arch/x86/entry/entry_64.o: > > > > text data bss dec hex filename > > 11530 0 0 11530 2d0a entry_64.o.before > > 11530 0 0 11530 2d0a entry_64.o.after > > > > md5: > > 1430e793250d5d8572bc2df2997d3929 entry_64.o.before.asm > > 1430e793250d5d8572bc2df2997d3929 entry_64.o.after.asm > > > > i.e. I have trouble reproducing the discrepancy you are seeing. (I also tried > > allmodconfig/allyesconfig again for good measure - no luck.) > > With allyesconfig I don't actually see a change. Only with the config I've attached. So I still cannot reproduce it even with your latest config: # arch/x86/entry/entry_64.o: text data bss dec hex filename 11530 0 0 11530 2d0a entry_64.o.before 11530 0 0 11530 2d0a entry_64.o.after md5: 1430e793250d5d8572bc2df2997d3929 entry_64.o.before.asm 1430e793250d5d8572bc2df2997d3929 entry_64.o.after.asm but I saw this during the build: scripts/Makefile.kasan:23: CONFIG_KASAN: compiler does not support all options. Trying minimal configuration is your KASAN build more fully enabled, and does the problem reproduce with CONFIG_KASAN turned off? 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/