Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753189AbZLVWHi (ORCPT ); Tue, 22 Dec 2009 17:07:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752051AbZLVWHg (ORCPT ); Tue, 22 Dec 2009 17:07:36 -0500 Received: from mail.crca.org.au ([67.207.131.56]:52275 "EHLO crca.org.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751340AbZLVWHf (ORCPT ); Tue, 22 Dec 2009 17:07:35 -0500 X-Greylist: delayed 586 seconds by postgrey-1.27 at vger.kernel.org; Tue, 22 Dec 2009 17:07:35 EST X-Bogosity: Ham, spamicity=0.000012 Message-ID: <4B3140E8.5080104@tuxonice.net> Date: Wed, 23 Dec 2009 08:58:00 +1100 From: Nigel Cunningham Reply-To: nigel@tuxonice.net User-Agent: Thunderbird 2.0.0.23 (X11/20090817) MIME-Version: 1.0 To: Peter Zijlstra CC: Pedro Ribeiro , linux-kernel@vger.kernel.org Subject: Re: WARN_ON at line 380 in kernel/smp.c under 2.6.32.2 + TuxOnIce + KDB References: <74fd948d0912220851v354b1704xa55fc3c88e1c300c@mail.gmail.com> <1261502431.4937.38.camel@laptop> <74fd948d0912221116l477a8a71w1feadc1341fc6e21@mail.gmail.com> <1261510020.4937.73.camel@laptop> In-Reply-To: <1261510020.4937.73.camel@laptop> X-Enigmail-Version: 0.95.7 OpenPGP: id=8B613241 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1136 Lines: 30 Hi. Peter Zijlstra wrote: > On Tue, 2009-12-22 at 19:16 +0000, Pedro Ribeiro wrote: >> On Tue, Dec 22, 2009 at 5:20 PM, Peter Zijlstra wrote: > >>> If you'd enable frame pointers the strack traces would be clearer, but >>> it looks like a bug in tux on ice, doing kmap_high() with IRQs disabled >>> or something like that. > >> I enabled frame pointers, is this more useful? >> http://img684.imageshack.us/img684/5118/dsc01206m.jpg >> http://img96.imageshack.us/img96/5493/dsc01207k.jpg >> http://img33.imageshack.us/img33/7470/dsc01208lp.jpg > > Those read more clearly indeed, thanks! > > It really looks like what I said above, in that tux on ice is calling > kmap() from an inappropriate context. Ah, I know now what's going on now. You're right. In working around a reported problem, I've triggered the warning. I'll give it some more consideration. Nigel -- 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/