Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754766AbZGUCi7 (ORCPT ); Mon, 20 Jul 2009 22:38:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754703AbZGUCi7 (ORCPT ); Mon, 20 Jul 2009 22:38:59 -0400 Received: from relais.videotron.ca ([24.201.245.36]:54833 "EHLO relais.videotron.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754699AbZGUCi6 (ORCPT ); Mon, 20 Jul 2009 22:38:58 -0400 MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=ISO-8859-1; format=flowed Message-id: <4A652A42.4040805@gmail.com> Date: Mon, 20 Jul 2009 22:38:58 -0400 From: Marc Dionne User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 To: Linus Torvalds Cc: Krzysztof Oledzki , Greg KH , linux-kernel@vger.kernel.org, Andrew Morton , stable@kernel.org, lwn@lwn.net Subject: Re: Linux 2.6.27.27 References: <20090720040655.GA11940@kroah.com> <4A645A45.9060509@ans.pl> <20090720151008.GC10015@suse.de> <4A650219.3060003@gmail.com> <4A650DE1.20105@gmail.com> In-reply-to: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1631 Lines: 41 On 07/20/2009 09:05 PM, Linus Torvalds wrote: > > On Mon, 20 Jul 2009, Marc Dionne wrote: >>> It could be ccache too, of course. >> Actually in my case it turns out that it is ccache after all - if I remove it >> from the picture everything is fine. If I re-enable it, even with a clean >> cache, I get the problem. >> >> It might just be a coincidence that it's triggered by the -fwrapv change. > > Btw, do you find any core-files lying around if you enable them before the > build with > > ulimit -c unlimited > > or similar? > > And how did you clean ccache? There's "-c" and then there's "-C". > > Linus Unfortunately I'm not able to reproduce anymore, after clearing /var/cache/ccache completely (rm -rf). Earlier I had done ccache -C, which didn't help. I didn't think to copy the contents for more analysis. So perhaps a combination of some odd ccache state along with changing gcc, binutils (which I updated today) and the compile flag. Revving binutils and gcc back and forth didn't reproduce it. What is odd though is that when I straced a single gcc command line that produced an empty .o file, it looked normal - a series of successful writes with the correct amount of data to a temp file, close, unlink .o file, rename temp file -> .o file. But the resulting file was empty. Make me wonder if there was something filesystem/caching related to it. Marc -- 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/