From owner-freebsd-current@FreeBSD.ORG Fri May 25 18:35:23 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 45CE116A421 for ; Fri, 25 May 2007 18:35:23 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.169]) by mx1.freebsd.org (Postfix) with ESMTP id AA50A13C4C3 for ; Fri, 25 May 2007 18:35:22 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: by ug-out-1314.google.com with SMTP id u2so378195uge for ; Fri, 25 May 2007 11:35:21 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=Alggxu6Z+Jy5/HKdexZ4iBWjOgdNrk06iz/1DdtC9Qy1f3TPxXnPtkS0+YtoQ5IAraKIRZM/uZHQsiy4oQdm7fdn5lwB5tTQtFZiKykXhliqSyzX9k+RYLQhdEFaF4vHO4C7m1SuPjSPUxRgCehb8NCu2x/ZswDoS189pwcWsoU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=RtpqvhSr9fNzOQ2oXD7n+xJhdvh0cc02Wk3VA5bNL0BMXnJ4qZkZGoUBw5Al9Kskcd7hTkF4SXDNeD1jo42yHM5OnHFhlqf/JxIpoxZGGZje1G4GobmZ6nmHdjdgbGUeQ/XxNrJCgRrQy+7uBmJAwzVepmrNsbZIuJQc41iAuks= Received: by 10.78.159.7 with SMTP id h7mr1029793hue.1180118121236; Fri, 25 May 2007 11:35:21 -0700 (PDT) Received: by 10.78.97.18 with HTTP; Fri, 25 May 2007 11:35:21 -0700 (PDT) Message-ID: <3bbf2fe10705251135j2b858529l964bf22285d5554e@mail.gmail.com> Date: Fri, 25 May 2007 20:35:21 +0200 From: "Attilio Rao" Sender: asmrookie@gmail.com To: "Joe Marcus Clarke" In-Reply-To: <46572970.5080201@marcuscom.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline 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> <46572970.5080201@marcuscom.com> X-Google-Sender-Auth: c3131f12e3433a9f 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 18:35:23 -0000 2007/5/25, Joe Marcus Clarke : > -----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. Very strange. Could you disable PREEMPTION and see if the error persists? Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein