From owner-freebsd-stable@FreeBSD.ORG Tue Jan 13 10:30:57 2009 Return-Path: Delivered-To: freebsd-stable@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id CC7C810656EB for ; Tue, 13 Jan 2009 10:30:57 +0000 (UTC) (envelope-from gavin@FreeBSD.org) Received: from mail-gw0.york.ac.uk (mail-gw0.york.ac.uk [144.32.128.245]) by mx1.freebsd.org (Postfix) with ESMTP id 62AFE8FC23 for ; Tue, 13 Jan 2009 10:30:56 +0000 (UTC) (envelope-from gavin@FreeBSD.org) Received: from mail-gw6.york.ac.uk (mail-gw6.york.ac.uk [144.32.129.26]) by mail-gw0.york.ac.uk (8.13.6/8.13.6) with ESMTP id n0DAUsVX001034; Tue, 13 Jan 2009 10:30:54 GMT Received: from buffy-128.york.ac.uk ([144.32.128.160] helo=buffy.york.ac.uk) by mail-gw6.york.ac.uk with esmtps (TLSv1:AES256-SHA:256) (Exim 4.68) (envelope-from ) id 1LMgXu-0006TJ-27; Tue, 13 Jan 2009 10:30:54 +0000 Received: from buffy.york.ac.uk (localhost [127.0.0.1]) by buffy.york.ac.uk (8.14.2/8.14.2) with ESMTP id n0DAUrCm070660; Tue, 13 Jan 2009 10:30:53 GMT (envelope-from gavin@FreeBSD.org) Received: (from ga9@localhost) by buffy.york.ac.uk (8.14.2/8.14.2/Submit) id n0DAUrlj070659; Tue, 13 Jan 2009 10:30:53 GMT (envelope-from gavin@FreeBSD.org) X-Authentication-Warning: buffy.york.ac.uk: ga9 set sender to gavin@FreeBSD.org using -f From: Gavin Atkinson To: Pete French In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Tue, 13 Jan 2009 10:30:53 +0000 Message-Id: <1231842653.70382.8.camel@buffy.york.ac.uk> Mime-Version: 1.0 X-Mailer: Evolution 2.22.2 FreeBSD GNOME Team Port X-York-MailScanner: Found to be clean X-York-MailScanner-From: gavin@freebsd.org Cc: freebsd-stable@FreeBSD.org Subject: Re: Big problems with 7.1 locking up :-( X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Jan 2009 10:30:58 -0000 On Mon, 2009-01-12 at 19:00 +0000, Pete French wrote: > > I'm not sure if you've done this already, but the normal suggestions apply: > > have you compiled with INVARIANTS/WITNESS/DDB/KDB/BREAK_TO_DEBUGGER, and do > > any results / panics / etc result? Sometimes these debugging tools are able > > to convert hangs into panics, which gives us much more ability to debug them. > > OK, I have now had a machine hand again, with the correct debug options in > the kernel. The screen looked like this when I went to restart it: > > http://toybox.twisted.org.uk/~pete/71_lor2.png > > It had not, however, dropped into any kind of debugger. Also there appear > to me console messages after the lock order reversal - is that normal ? > > The machine did stay up for a signifanct amount of time before doing this. I > notice that it is more or less identical to the one I posted whenI > had WITNESS_KDB in the kernel too, so maybe those results arent > entirely suprious after all ? > > Given it hasnt dropped to a debugger, is there anything else I can try ? Can you break into the debugger with Ctrl-Alt-Esc, or by sending a break over the serial line? Gavin