From owner-freebsd-stable@FreeBSD.ORG Wed Aug 10 14:33:50 2011 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 313E8106564A for ; Wed, 10 Aug 2011 14:33:50 +0000 (UTC) (envelope-from prvs=1203777b38=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id B01F68FC1D for ; Wed, 10 Aug 2011 14:33:49 +0000 (UTC) X-MDAV-Processed: mail1.multiplay.co.uk, Wed, 10 Aug 2011 15:22:25 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Wed, 10 Aug 2011 15:22:25 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 ([188.220.16.49]) by mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) (MDaemon PRO v10.0.4) with ESMTP id md50014544638.msg for ; Wed, 10 Aug 2011 15:22:24 +0100 X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=1203777b38=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk X-MDaemon-Deliver-To: freebsd-stable@freebsd.org Message-ID: <47F0D04ADF034695BC8B0AC166553371@multiplay.co.uk> From: "Steven Hartland" To: Date: Wed, 10 Aug 2011 15:22:52 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6109 Subject: debugging frequent kernel panics on 8.2-RELEASE 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: Wed, 10 Aug 2011 14:33:50 -0000 We're currently experiencing a large number of kernel panics on FreeBSD 8.2-RELEASE across a large number of machines here. The base stack reported is a double fault with no additional details and CTRL+ALT+ESC fails to break to the debugger as does and NMI, even though it at least tries printing the following many times some quite jumbled:- NMI ... going to debugger We've configured the dump device but that also seems to fail to capture any details just sitting there after panic with Dumping 4465MB: The machines are single disk ZFS root install and the dump device is configured using the gptid, could this be what's preventing the dump happening? The kernel is compiled with:- options KDB # Kernel debugger related code options KDB_TRACE # Print a stack trace for a panic We have remove KVM but not remote serial on the most of the machines. Any advice on how to debug this issue? Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.