From owner-freebsd-net@FreeBSD.ORG  Mon Mar 24 19:07:15 2008
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 060CF1065677
	for <net@freebsd.org>; Mon, 24 Mar 2008 19:07:15 +0000 (UTC)
	(envelope-from sam@freebsd.org)
Received: from ebb.errno.com (ebb.errno.com [69.12.149.25])
	by mx1.freebsd.org (Postfix) with ESMTP id AB0698FC25
	for <net@freebsd.org>; Mon, 24 Mar 2008 19:07:14 +0000 (UTC)
	(envelope-from sam@freebsd.org)
Received: from trouble.errno.com (trouble.errno.com [10.0.0.248])
	(authenticated bits=0)
	by ebb.errno.com (8.13.6/8.12.6) with ESMTP id m2OISUcr040464
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Mon, 24 Mar 2008 11:28:32 -0700 (PDT) (envelope-from sam@freebsd.org)
Message-ID: <47E7F2CE.503@freebsd.org>
Date: Mon, 24 Mar 2008 11:28:30 -0700
From: Sam Leffler <sam@freebsd.org>
Organization: FreeBSD Project
User-Agent: Thunderbird 2.0.0.9 (X11/20071125)
MIME-Version: 1.0
To: Robert Jenssen <robertjenssen@ozemail.com.au>
References: <200803232052.07111.robertjenssen@ozemail.com.au>
In-Reply-To: <200803232052.07111.robertjenssen@ozemail.com.au>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-DCC-Misty-Metrics: ebb.errno.com; whitelist
Cc: net@freebsd.org
Subject: Re: Lock order reversal in ral driver
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 24 Mar 2008 19:07:15 -0000

Robert Jenssen wrote:
> Hi,
>
> Since upgrading to FreeBSD 7 I have been experiencing some frustrating 
> problems with my RAL wifi card. In particular, it seems to me that dhclient 
> fails when the ral device driver times out while scanning for my access 
> point. At the same time my HP PDA with Spectec WiFi SDIO card has no problems 
> finding my access point.
>
> Today I made a kernel with the following options:
>
> makeoptions     DEBUG=-g
> options         INVARIANTS
> options         INVARIANT_SUPPORT
> options         WITNESS
> options         DEBUG_LOCKS
> options         DEBUG_VFS_LOCKS
> options         DIAGNOSTIC
> options         SOCKBUF_DEBUG
> options         DDB
> options         KDB
>
> Upon rebooting the dmesg immediately showed a lock order reversal in the ral 
> driver in ieee80211_scan.c and rt2560.c (see below). Does this correspond to 
> my symptoms? Is there a wizard out there who understands what is happening?
>   
    <...stuff snipped...>

The LOR is unrelated to any issues you are seeing and can be safely 
ignored.  Try providing a description of your setup and a log that 
indicates the problem.  For the latter look at wlandebug(8).

    Sam