From owner-freebsd-net@FreeBSD.ORG Wed May 21 20:26:11 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 3205D106564A for ; Wed, 21 May 2008 20:26:11 +0000 (UTC) (envelope-from jfvogel@gmail.com) Received: from wa-out-1112.google.com (wa-out-1112.google.com [209.85.146.183]) by mx1.freebsd.org (Postfix) with ESMTP id 069B48FC0C for ; Wed, 21 May 2008 20:26:10 +0000 (UTC) (envelope-from jfvogel@gmail.com) Received: by wa-out-1112.google.com with SMTP id j4so2845504wah.3 for ; Wed, 21 May 2008 13:26:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=pbl/UojuUhUuzALd7iZZV5mO0rCozM0ixhFxTHZrqZQ=; b=WxFIQhieZ9wAh4Ahrm6IB+1QfHsb3KAaefay+i94cew5bVlZkyNCZ295uVs3BBqpdAMioUSBZ8QGElP6gAhTNtvt3qOP2l42t9ujz5nGSA6rsEuA2DlPhgUz5zA9REUao4Mge2SFlxHyWk+eOU0sdJ5Po7PdUJEvXb4Zkq29GzE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=EdK1g014w4s0quTV62X0OIdY23o0BxEYmVe0g4hPMX+LnhrpTb4bmW8EhLK0Uh+Zjq31jr3Cyj6ORARpLVicVPddApXILW/LDekKKpjUXDd8mbPtQkhHbnu/Ih5gp2Sf6pegR7076ZMmtk3937woaT9D8+EAvKiP6ONPJ2lV9JA= Received: by 10.114.210.2 with SMTP id i2mr1263096wag.18.1211401570051; Wed, 21 May 2008 13:26:10 -0700 (PDT) Received: by 10.114.177.4 with HTTP; Wed, 21 May 2008 13:26:09 -0700 (PDT) Message-ID: <2a41acea0805211326v74baa017tc03fcd329a764ef5@mail.gmail.com> Date: Wed, 21 May 2008 13:26:09 -0700 From: "Jack Vogel" To: "Neil Hoggarth" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: Cc: freebsd-net@freebsd.org Subject: Re: [em][panic] recursed on non-recursive mutex em0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 May 2008 20:26:11 -0000 On Wed, May 21, 2008 at 12:11 PM, Neil Hoggarth wrote: > Hi Folks, > > I opened PR kern/122928 last month, describing my problems with Intel > PRO/1000 MT adaptor on 7-STABLE, with v6.7.3 of the em driver: every > so often the machine would get into a state where it would repeatedly > watchdog timeout the em0 interface, and the interface would stop > receiving packets. > > A few weeks ago I cvsupped a newer version of the 7-STABLE source > tree, after v6.9.0 of the em driver was MFCed. Since I started running > on the newer build watchdog timeouts appear to be followed by a system > panic rather than the freezing up of the interface. I have no hard > evidence but it "feels like" the panics are happening under the same > sort of circumstance that was previously triggering my watchdog > problem (basically network activity combined with CPU load). A similar > observation was made by Yani Karydis on the freebsd-stable mailing > list earlier in the month: > > http://lists.freebsd.org/pipermail/freebsd-stable/2008-May/042311.html > > I've now got a serial console set up, and I'm running a kernel with > DDB support compiled in. I managed to get the information below out of > the most recent panic. Is anyone able to use this to debug the > situation? What else might I try to gather useful information? This is a helpful start, I'll stare at the code and see... sounds like some rx lock design issue. Thanks Neil, Jack