From owner-freebsd-current@FreeBSD.ORG Fri May 25 18:22:23 2007 Return-Path: X-Original-To: Current@freebsd.org Delivered-To: freebsd-current@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 0C97A16A421; Fri, 25 May 2007 18:22:23 +0000 (UTC) (envelope-from marcus@marcuscom.com) Received: from creme-brulee.marcuscom.com (creme-brulee.marcuscom.com [24.172.16.118]) by mx1.freebsd.org (Postfix) with ESMTP id 9E50413C483; Fri, 25 May 2007 18:22:22 +0000 (UTC) (envelope-from marcus@marcuscom.com) Received: from [10.2.1.101] (vpn-client-101.marcuscom.com [10.2.1.101]) by creme-brulee.marcuscom.com (8.14.1/8.14.1) with ESMTP id l4PIMWNM087459; Fri, 25 May 2007 14:22:32 -0400 (EDT) (envelope-from marcus@marcuscom.com) Message-ID: <46572970.5080201@marcuscom.com> Date: Fri, 25 May 2007 14:22:40 -0400 From: Joe Marcus Clarke Organization: MarcusCom, Inc. User-Agent: Thunderbird 2.0.0.0 (Macintosh/20070326) MIME-Version: 1.0 To: Attilio Rao References: <1179962663.75721.6.camel@shumai.marcuscom.com> <20070523165051.G9443@10.0.0.1> <4655D5C1.2010905@FreeBSD.org> <1180022919.10757.24.camel@shumai.marcuscom.com> <3bbf2fe10705240930o10f37febt9fb5f0a46bd193c3@mail.gmail.com> <4657267C.2070306@marcuscom.com> <3bbf2fe10705251116h1a4606fg6250d917247a5143@mail.gmail.com> In-Reply-To: <3bbf2fe10705251116h1a4606fg6250d917247a5143@mail.gmail.com> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-4.4 required=5.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.1.8 X-Spam-Checker-Version: SpamAssassin 3.1.8 (2007-02-13) on creme-brulee.marcuscom.com Cc: Jeff Roberson , Current@freebsd.org Subject: Re: Panic on -CURRENT after LDT changes X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 25 May 2007 18:22:23 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Attilio Rao wrote: > 2007/5/25, Joe Marcus Clarke : >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Attilio Rao wrote: >> > 2007/5/24, Joe Marcus Clarke : >> >> On Thu, 2007-05-24 at 20:13 +0200, Attilio Rao wrote: >> >> > Jeff Roberson wrote: >> >> > > Thanks, Attilio and I will look at this right away. >> >> > > >> >> > > Jeff >> >> > > >> >> > > On Wed, 23 May 2007, Joe Marcus Clarke wrote: >> >> > > >> >> > >> On a -CURRENT build today with Jeff's LDT locking changes, I >> get an >> >> > >> instant, reproducible panic by doing: >> >> > >> >> >> > >> # cd /usr/src >> >> > >> # make -DNO_CLEAN buildworld >> >> > >> >> >> > >> Backing out the LDT changes to /sys/i386/i386/*machdep* >> corrects the >> >> > >> problem. Here is a dmesg and backtrace. In frame 6, it appears >> >> mdp is >> >> > >> NULL (i.e. td->td_proc->p_md = 0x0). >> >> > >> >> > Did you enable WITNESS/INVARIANTS/INVARIANT_SUPPORT? >> >> >> >> No, this kernel does not have WITNESS or INVARIANTS. I can enable >> those >> >> tomorrow if that would give you more useful information. >> > >> > It would be very appreciated, since I've been unable to reproduce your >> > panic on a centrino dual core. >> >> I'm stopped in the debugger now with WITNESS and friends enabled. Same >> backtrace as before. I did a "show locks" and I see: >> >> exclusive spin mutex descriptor tables r = 0 (0xc08369f8) locked @ >> /usr/src/sys/i386/i386/sys_machdep.c:629 >> >> Please let me know what else you'd like to see while I'm at the >> debugger. FYI: this is a Pentium 4 with "options SMP" disabled. > > This is a multicore? do you have PREEMPTION/FULL_PREEMPTION installed? No, single core with PREEMPTION enabled only. Joe > > Attilio > > - -- PGP Key : http://www.marcuscom.com/pgp.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGVylwb2iPiv4Uz4cRAvDaAJ0eD4swI1OvZ6vINo3TlPjnfqEUMwCgg2jo 9wB314PFlbbLLcwuX2qyOy8= =qmFu -----END PGP SIGNATURE-----