From owner-freebsd-stable@FreeBSD.ORG Fri Jul 29 12:54:59 2005 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8EF4416A41F; Fri, 29 Jul 2005 12:54:59 +0000 (GMT) (envelope-from scrappy@hub.org) Received: from hub.org (hub.org [200.46.204.220]) by mx1.FreeBSD.org (Postfix) with ESMTP id 22D8843D45; Fri, 29 Jul 2005 12:54:59 +0000 (GMT) (envelope-from scrappy@hub.org) Received: from localhost (unknown [200.46.204.144]) by hub.org (Postfix) with ESMTP id A317CA247A8; Fri, 29 Jul 2005 09:54:53 -0300 (ADT) Received: from hub.org ([200.46.204.220]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 31463-07; Fri, 29 Jul 2005 12:54:53 +0000 (GMT) Received: from ganymede.hub.org (blk-224-176-51.eastlink.ca [24.224.176.51]) by hub.org (Postfix) with ESMTP id 39F0EA24629; Fri, 29 Jul 2005 09:54:53 -0300 (ADT) Received: by ganymede.hub.org (Postfix, from userid 1000) id CE7DA34F92; Fri, 29 Jul 2005 09:55:00 -0300 (ADT) Received: from localhost (localhost [127.0.0.1]) by ganymede.hub.org (Postfix) with ESMTP id C742934253; Fri, 29 Jul 2005 09:55:00 -0300 (ADT) Date: Fri, 29 Jul 2005 09:55:00 -0300 (ADT) From: "Marc G. Fournier" To: Robert Watson In-Reply-To: <20050729092127.V74149@fledge.watson.org> Message-ID: <20050729095407.O997@ganymede.hub.org> References: <20050728231728.E968@ganymede.hub.org> <20050729092127.V74149@fledge.watson.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Virus-Scanned: by amavisd-new at hub.org Cc: freebsd-stable@freebsd.org Subject: Re: Consistent file system hang with RELENG_6 of today ... 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, 29 Jul 2005 12:54:59 -0000 Oh, before I forget ... how do you break to DDB from a serial console? I'll be running a Portmaster for this ... On Fri, 29 Jul 2005, Robert Watson wrote: > > On Thu, 28 Jul 2005, Marc G. Fournier wrote: > >> 'k, I'm starting to play with 6.x, for our new server ... my priority right >> now is to just have it run the existing 'jail' environments from my 4.x >> machine, while I work on getting all of our servers up to 6.x, and then >> will worry about the jail's themselves ... >> >> When I try and startup the 4.x jail on my 6.x machine, it "hangs" the file >> system that the jail directory hierarchy happens to be mounted on though >> ... twice in a row so far ... >> >> Now, I'm suspecting (and am going to try without it) that it might be >> because I'm mounting devfs within the 4.x jail, but even then, it shouldn't >> hang things up, only generate a whack of errors ... >> >> I have a good dump (CTL-ALT-ESC -> panic), but do not have a clue what to >> offer from within there that might be of any use ... >> >> If anyone is interested ... ? > > If you can get into DDB and have serial console output, the following would > be useful: > > The output of 'show pcpu' > > The output of 'show pcpu X' for each present cpu, starting with 0. > > The output of 'ps' > > The output of 'trace' for the currently running thread, and each non-idle > thread shown in the show pcpu output > > The output of 'show lockedvnods' > > It would also be useful if, relating to the startup of the jail, you can > identify the point in the jail boot where it wedges, and if you hit Ctrl-T, > what process is shown as running and what state it is in, and using DDB, > trace that process. > > If you could show the trace output for each process listed in "show > lockevnods". > > Likely, there is a leaked lock or a low buffer condition. However, once we > have the above output we should be able to say more. The above will > hopefully tell us whether it's a vnode deadlock, and ideally, the approximate > source. > > Robert N M Watson > > ---- Marc G. Fournier Hub.Org Networking Services (http://www.hub.org) Email: scrappy@hub.org Yahoo!: yscrappy ICQ: 7615664