From owner-freebsd-hackers@FreeBSD.ORG Fri May 29 04:54:08 2009 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1806D106566C for ; Fri, 29 May 2009 04:54:08 +0000 (UTC) (envelope-from davidn04@gmail.com) Received: from mail-qy0-f173.google.com (mail-qy0-f173.google.com [209.85.221.173]) by mx1.freebsd.org (Postfix) with ESMTP id C86018FC12 for ; Fri, 29 May 2009 04:54:07 +0000 (UTC) (envelope-from davidn04@gmail.com) Received: by qyk3 with SMTP id 3so8483928qyk.3 for ; Thu, 28 May 2009 21:54:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type:content-transfer-encoding; bh=1ldIw2Htf3u1ZOZh408gNCKkso2Eadl+BUbp5GJ9iPg=; b=d4iDKL3rKoHQv0/geBm4LmGcpipuDDawmeFxD1lqcQG17ahB2yUcP6yIghJk+YAHQi HbqpUT9ZUu0iojiAcLW6153xAK4VgDBRs3GezW2PYIeutLS98oJTGDxueHj0mgORDJXT 4nC2Wid211OgYgs32o1xlRYgBTgwof6FEew9Q= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; b=YyPYM8XBR9a2J/cuUosuOKir4hcVLYkNfHH9HUvfRPvVETwjPTPQw05r8XkuZyuOqI MdZwOl93iFphp0Q40VGXb93yNiNsTX6FXHhCD7cyoY51HC+k6Y59lX58n7W++iyOygX4 rQ91TD7CTJNEvS2su8Rd551i98M8MReWS7TtY= MIME-Version: 1.0 Received: by 10.229.84.82 with SMTP id i18mr978435qcl.90.1243571224641; Thu, 28 May 2009 21:27:04 -0700 (PDT) Date: Fri, 29 May 2009 14:27:04 +1000 Message-ID: <4d7dd86f0905282127u5215979akdd8ea286c73f090e@mail.gmail.com> From: David N To: freebsd-hackers@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Debugging via DDB X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2009 04:54:08 -0000 Hi, I know this might sound like a newbie question. I'm trying to debug a "Lockup" on 7.2-RELEASE. I've compiled DDB and KDB into the kernel and make installkernel. (Can this be called a deadlock?) The machine still response to pings, but it looks like all disk activity has stopped. I can break into the debugger using CTRL-ALT-ESC, but after that, i dont know what I'm looking for in particular. bt (backtrace) gives me the stuff like the keyboard mutex ( i assume it was the last thing that happened, but obviously it was the break) Should I be including WITNESS? Regards David N