From owner-freebsd-stable@FreeBSD.ORG Tue Oct 14 09:53:48 2008 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 94815106568E; Tue, 14 Oct 2008 09:53:48 +0000 (UTC) (envelope-from gerrit@pmp.uni-hannover.de) Received: from mrelay1.uni-hannover.de (mrelay1.uni-hannover.de [130.75.2.106]) by mx1.freebsd.org (Postfix) with ESMTP id 1B4508FC16; Tue, 14 Oct 2008 09:53:47 +0000 (UTC) (envelope-from gerrit@pmp.uni-hannover.de) Received: from www.pmp.uni-hannover.de (www.pmp.uni-hannover.de [130.75.117.2]) by mrelay1.uni-hannover.de (8.14.2/8.14.2) with ESMTP id m9E9rXF4025741; Tue, 14 Oct 2008 11:53:35 +0200 Received: from pmp.uni-hannover.de (arc.pmp.uni-hannover.de [130.75.117.1]) by www.pmp.uni-hannover.de (Postfix) with SMTP id 2C41972; Tue, 14 Oct 2008 11:53:33 +0200 (CEST) Date: Tue, 14 Oct 2008 11:53:33 +0200 From: Gerrit =?ISO-8859-1?Q?K=FChn?= To: John Baldwin Message-Id: <20081014115333.3d3e41ab.gerrit@pmp.uni-hannover.de> In-Reply-To: <200810131027.40630.jhb@freebsd.org> References: <20080807132947.061d24eb.gerrit@pmp.uni-hannover.de> <200810101122.16492.jhb@freebsd.org> <20081013090946.0e0ba33e.gerrit@pmp.uni-hannover.de> <200810131027.40630.jhb@freebsd.org> Organization: Albert-Einstein-Institut (MPI =?ISO-8859-1?Q?f=FCr?= Gravitationsphysik & IGP =?ISO-8859-1?Q?Universit=E4t?= Hannover) X-Mailer: Sylpheed 2.4.8 (GTK+ 2.12.11; i386-portbld-freebsd7.0) Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-PMX-Version: 5.4.1.325704, Antispam-Engine: 2.6.0.325393, Antispam-Data: 2008.10.14.93120 Cc: freebsd-stable@freebsd.org, Jeremy Chadwick , d@delphij.net, jeff@freebsd.org Subject: Re: Regression 7.0R -> 7-stable? 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, 14 Oct 2008 09:53:48 -0000 On Mon, 13 Oct 2008 10:27:40 -0400 John Baldwin wrote about Re: Regression 7.0R -> 7-stable?: JB> On Monday 13 October 2008 03:09:46 am Gerrit K=FChn wrote: JB> > JB> Ok, can you run gdb on your kernel.debug and do JB> > JB> 'l *0xffffffff804608c0' JB> > 0xffffffff804608c0 is in scheduler (/usr/src/sys/vm/vm_glue.c:670). JB> > [...lines 665-674...] JB> I was afraid of that, it basically means that it finished the entire JB> boot process. =20 I already thought so because I saw a grey (not white) cursor afterwards. JB> The next step is that init (pid 1) should be scheduled JB> and try to execute. You can maybe add some printf's to the code to JB> start up init to see how far it gets. The routine in question is JB> 'start_init()' in sys/kern/init_main.c. Let me see... I added my first printf in line 619 (and several after that), right after the "Need just enough stack..." comment. This was never reached, the system hangs before that. After that I added printf before and after vfs_mountroot(). Now the things runs just a bit further for the first time. I see my new printfs and between them the message "Trying to mount root from ufs:/dev/ad0s1a". After that come all my printfs I had added before, followed by "start_init: trying /sbin/init". Then it hangs again. I am a bit puzzled because I did not see the "Trying to mount..." and "start_init:..." messages before. Just trying again to boot with the same setup hangs in vfs_mountroot() (printf before is displayed, printf after not). It appears to me as if the hang is caused by some kind of "parallel task", and what I am seeing on the console stops a bit earlier or later depending on that. As I am seeing this only with the ULE-scheduler: Is the scheduler already in action at this point, and may the hang depend on what it is deciding to do? cu Gerrit