From owner-freebsd-hackers@FreeBSD.ORG Wed Aug 1 00:20:02 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 84074106568C for ; Wed, 1 Aug 2012 00:20:02 +0000 (UTC) (envelope-from asmrookie@gmail.com) Received: from mail-lpp01m010-f54.google.com (mail-lpp01m010-f54.google.com [209.85.215.54]) by mx1.freebsd.org (Postfix) with ESMTP id EE0D78FC12 for ; Wed, 1 Aug 2012 00:20:01 +0000 (UTC) Received: by laai10 with SMTP id i10so5273872laa.13 for ; Tue, 31 Jul 2012 17:20:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=DZXamykAOUDBansMTgbiVkPUpOBHpQY1gP+6p312by8=; b=MrnbAHTSSlSWr0trTLEh8qyaMrS6rwcPL6MWO+qA9t6IoI0+/UdeVLARXEKs6hJg6a Yn1+PbPfGsD8BXBFOhuAbeMsTQxMJUnMB/sZQOFEIlZ/MUvLAYZ/R8orUXRTMLB+epiC 7LgpZudghRxNuqXzsK7K+oGHQHrFkw0VXwIddLhEPrd82OFOL/F9xJ+AzmJ0Zvpf4/fY p6gW7BeLoxhL7Jt2boDC3u8ttDX3uDbhfntiFmOJ7ZRRLuL+Yq6WlyMq7Ka3zZtnjPUf IMOXReExMIF9LPdgro2p/JJJrJFwbd0EwXd6Je279WgySDYCgZG8gzcCBfdsmwjTYndt mY+Q== MIME-Version: 1.0 Received: by 10.152.131.9 with SMTP id oi9mr16253679lab.39.1343780400600; Tue, 31 Jul 2012 17:20:00 -0700 (PDT) Sender: asmrookie@gmail.com Received: by 10.112.27.65 with HTTP; Tue, 31 Jul 2012 17:20:00 -0700 (PDT) In-Reply-To: <501871FD.601@rawbw.com> References: <501871FD.601@rawbw.com> Date: Wed, 1 Aug 2012 01:20:00 +0100 X-Google-Sender-Auth: QCHKeXJY4Ef5q-geETA-dFUUqjo Message-ID: From: Attilio Rao To: Yuri Content-Type: text/plain; charset=UTF-8 Cc: freebsd-hackers@freebsd.org Subject: Re: How to diagnose system freezes? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: attilio@FreeBSD.org List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Aug 2012 00:20:02 -0000 On 8/1/12, Yuri wrote: > One of my 9.1-BETA1 systems periodically freezes. If sound was playing, > it would usually cycle with a very short period. And system stops being > sensitive to keyboard/mouse. Also ping of this system doesn't get a > response. > I would normally think that this is the faulty memory. But memory was > recently replaced and tested with memtest+ for hours both before and > after freezes and it passes all tests. > One out of the ordinary thing that is running on this system is nvidia > driver. But the freezes happen even when there is no graphics activity. > Another out of the ordinary thing is that the kernel is built for > DTrace. But DTrace was never used in the sessions that had a freeze. > > What is the way to diagnose this problem? Start by adding SW_WATCHDOG to your machine with a reasonably low timeout. Also, can you use a serial console? If yes you may consider going with a serial break. Attilio -- Peace can only be achieved by understanding - A. Einstein