From owner-freebsd-stable@FreeBSD.ORG Wed Mar 29 21:00:04 2006 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 4049D16A424 for ; Wed, 29 Mar 2006 21:00:04 +0000 (UTC) (envelope-from Cy.Schubert@komquats.com) Received: from spqr.komquats.com (S0106002078125c0c.gv.shawcable.net [24.108.150.239]) by mx1.FreeBSD.org (Postfix) with ESMTP id B438143D53 for ; Wed, 29 Mar 2006 21:00:03 +0000 (GMT) (envelope-from Cy.Schubert@komquats.com) Received: from cwsys.cwsent.com (cwsys [10.1.1.1]) by spqr.komquats.com (Postfix) with ESMTP id 7C81E4C5C5 for ; Wed, 29 Mar 2006 13:00:02 -0800 (PST) Received: from cwsys (localhost [127.0.0.1]) by cwsys.cwsent.com (8.13.4/8.13.4) with ESMTP id k2TL01rA086571 for ; Wed, 29 Mar 2006 13:00:02 -0800 (PST) (envelope-from Cy.Schubert@komquats.com) Message-Id: <200603292100.k2TL01rA086571@cwsys.cwsent.com> X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 From: Cy Schubert X-os: FreeBSD X-Sender: cy@cwsent.com X-URL: http://www.komquats.com/ To: freebsd-stable@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 29 Mar 2006 13:00:01 -0800 Sender: Cy.Schubert@komquats.com Subject: Strange Panic During Reboot X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Cy Schubert List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Mar 2006 21:00:04 -0000 I'm getting the following panic during shutdown of a 6.1-PRERELEASE system cvsupped yesterday. Strangely enabling DDB in the kernel "fixes" the problem. The computer is an old P120 (which I should probably replace). It occurs every time when DDB is disabled but when DDB is enabled, it does not panic. All buffers synced. Uptime: 19m16s (da0:ahc0:0:0:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0 (da0:ahc0:0:0:0): Sense Error Code 0xe0 at block no. -1073741792 (decimal) kernel trap 12 with interrupts disabled Fatal trap 12: page fault while in kernel mode fault virtual address = 0x1c fault code = supervisor write, page not present instruction pointer = 0x20:0xc0539553 stack pointer = 0x28:0xc6da2a68 frame pointer = 0x28:0xc6da2ab4 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = resume, IOPL = 0 current process = 1728 (reboot) trap number = 12 panic: page fault Uptime: 19m16s I suspect that memory is mapped a tiny bit differently with DDB enabled and thus we don't tickle a bug somewhere. Thoughts? -- Regards, Phone: (250)387-8437 Cy Schubert Fax: (250)387-5231 Team Leader, Solaris Team Email: Cy.Schubert@osg.gov.bc.ca Open Systems Group, CITS Ministry of Labour and Citizens' Services Province of BC FreeBSD UNIX: cy@FreeBSD.org