From owner-freebsd-stable@FreeBSD.ORG Fri May 23 19:57:59 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 C0E5F106567C for ; Fri, 23 May 2008 19:57:59 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from elvis.mu.org (elvis.mu.org [192.203.228.196]) by mx1.freebsd.org (Postfix) with ESMTP id 8EA9F8FC25 for ; Fri, 23 May 2008 19:57:59 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (server.baldwin.cx [208.65.91.234]) by elvis.mu.org (Postfix) with ESMTP id 0D4991A4D82; Fri, 23 May 2008 12:57:58 -0700 (PDT) Received: from localhost.corp.yahoo.com (john@localhost [127.0.0.1]) (authenticated bits=0) by server.baldwin.cx (8.14.2/8.14.2) with ESMTP id m4NJvj02019389; Fri, 23 May 2008 15:57:46 -0400 (EDT) (envelope-from jhb@freebsd.org) From: John Baldwin To: Kostik Belousov Date: Fri, 23 May 2008 12:38:10 -0400 User-Agent: KMail/1.9.7 References: <720051dc0805220159n23eb6205yfcf9450be7af5c77@mail.gmail.com> <200805230829.09524.jhb@freebsd.org> <20080523132645.GO29770@deviant.kiev.zoral.com.ua> In-Reply-To: <20080523132645.GO29770@deviant.kiev.zoral.com.ua> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200805231238.10786.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [127.0.0.1]); Fri, 23 May 2008 15:57:46 -0400 (EDT) X-Virus-Scanned: ClamAV 0.91.2/7222/Fri May 23 08:53:12 2008 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-4.1 required=4.2 tests=ALL_TRUSTED,AWL,BAYES_00, DATE_IN_PAST_03_06 autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: freebsd-stable@freebsd.org, James Seward , Mark Kirkwood Subject: Re: BTX loader hangs after version info 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: Fri, 23 May 2008 19:57:59 -0000 On Friday 23 May 2008 09:26:45 am Kostik Belousov wrote: > On Fri, May 23, 2008 at 08:29:09AM -0400, John Baldwin wrote: > > On Friday 23 May 2008 07:53:11 am Kostik Belousov wrote: > > > On Fri, May 23, 2008 at 01:22:55PM +1200, Mark Kirkwood wrote: > > > > James Seward wrote: > > > > >Hello, > > > > > > > > > >Two days ago I csup'd my desktop at home, which was running RELENG_7 > > > > >from about 7.0-RELEASE time, to bring it up-to-date (still on > > > > >RELENG_7). I followed my usual buildkernel/world procedure (the usual > > > > >one) which has worked fine all the way since 5.x. After installing > > > > >kernel and restarting in single user, it was working fine. However, > > > > >following installworld it will not boot. > > > > > > > > > >It stops immediately after "BTX loader 1.00 BTX version 1.02", but > > > > >with the cursor on the line *above* the first "B". Nothing futher > > > > >happens, but the system responds to Ctrl-Alt-Del. > > > > > > > > > >I have managed to start it using the install CD and csup'd back to a > > > > >version just before the commit to BTX that moved it to 1.02 (March > > > > >18th, I think). However, that version too hangs after "BTX loader 1.00 > > > > >BTX version 1.01". > > > > > > > > > >My desktop is currently building RELENG_7_0 to see if that will work, > > > > >but I won't know that until later as I'm at work and it is at home :) > > > > > > > > > >The install CD (BTX 1.00/1.01) boots fine. Nothing else changed on my > > > > >system between the last successful boot and the unsuccessful one. > > > > > > > > > >Any suggestions/advice for what I can try next, or what I can do to > > > > >help the troubleshooting process? > > > > > > > > > >My desktop is an Athlon64 but I am using i386, on an Asus A8V-E Deluxe > > > > >board. > > > > > > > > FWIW - I am seeing this too, on a Supermicro P3TDDE. 7-STABLE src from > > > > 28-Feb is fine, but Mar, Apr, May code all hangs after printing "loading > > > > /boot/defaults/loader.conf" - presumably reading my /boot/loader.conf? > > > > > > > > Interestingly I can usually get it to boot by escaping to the loader > > > > prompt and then just pressing return. > > > > > > > > Oddly some other machines (Supermicro P3TDER and Asus PRO31J Laptop) > > > > behave normally with src from Mar->May. > > > > > > > > In all cases the canonical procedure from UPDATING was used (buildworld, > > > > kernel, reboot single, mergemaster -p, installworld, delete-old, > > > > mergemaster, reboot). > > > > > > > > I happy to help collect some debug info (how do you switch this on for > > > > the loader?), tho the machine exhibiting the problem is my workstation > > > > (of course)! > > > > > > Try to install new bootblock. > > > > I would be wary of that as it might make things worse? These problems are all > > from starting /boot/loader. boot2 is still working fine and thus there is > > still the possiblity of using boot2 to load /boot/loader.old as a workaround. > > If you update boot2 and it breaks you can't fix that w/o booting off of some > > other media such as a CD. > > > > Debugging these hangs is not easy to do remotely. If you know assembly then > > there are some things you can play with. For example, in the case where it > > hangs after printing out the BTX version (from btxldr.S) you could start > > adding debugging to btx.S to print out '.' characters in various places and > > see how many get printed out before it hangs. However, doing this requires > > familiarity with assembly and is a lot easier with physical access to a box. > > When I worked on my version of the realbtx, I sometimes experienced hangs when > vm86 btx run before real-mode btx. I did not investigated it then, only noted > the issue. We could get a hang if a vm86 request was ever done with interrupts disabled for some reason. I'll see if I can add some assertions to make BTX explicitly panic if that happens. -- John Baldwin