From owner-freebsd-wireless@FreeBSD.ORG  Sat Aug 18 06:15:10 2012
Return-Path: <owner-freebsd-wireless@FreeBSD.ORG>
Delivered-To: freebsd-wireless@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 2A285106564A
	for <freebsd-wireless@freebsd.org>;
	Sat, 18 Aug 2012 06:15:10 +0000 (UTC)
	(envelope-from adrian.chadd@gmail.com)
Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com
	[209.85.210.54])
	by mx1.freebsd.org (Postfix) with ESMTP id F16CC8FC12
	for <freebsd-wireless@freebsd.org>;
	Sat, 18 Aug 2012 06:15:09 +0000 (UTC)
Received: by dadr6 with SMTP id r6so1245648dad.13
	for <freebsd-wireless@freebsd.org>;
	Fri, 17 Aug 2012 23:15:09 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
	h=mime-version:sender:in-reply-to:references:date
	:x-google-sender-auth:message-id:subject:from:to:content-type;
	bh=8/CaZj+tfqWC+Q6oYiqsoHW3/qS0XYIGChMUR3L/Ov8=;
	b=pFNXtLf/er21gCUsyoWIu005UFrD29K6RYNGIUdVP2x6sNoAt5hjZn0jB8t893yY4n
	yr9lWIswprfwqymieJogQ6ewgOsdaF/jXR4CRtiZGTxvayASncZOJBPWgs5hjM6KoSDh
	qpj3d6ZQYohi/ZIhB9hJCfeyOw4hnrFF9eiN6M34PBB0D7b+67pBKeIzW6pV7uO8remV
	ECiQ7B9CwN1qRDqYsoWQocY5Gh5Uq2ho6TPTnUuYHv/XMpcgK+nWkJZaHU6u2pOIqAYE
	+fZSNnTJwWD9A9a/tRhEWDatXSsFniS9icuOUQiDVyZL7T7JjVxny5HNCkODWNlgLkeC
	eM5Q==
MIME-Version: 1.0
Received: by 10.68.236.102 with SMTP id ut6mr17187904pbc.113.1345270509321;
	Fri, 17 Aug 2012 23:15:09 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.68.43.169 with HTTP; Fri, 17 Aug 2012 23:15:09 -0700 (PDT)
In-Reply-To: <CAJ-Vmok8wTVoy5UWh9QsKkLj8HWO0qfL=7UK-xtqezcK7OZgew@mail.gmail.com>
References: <CAJ-Vmok8wTVoy5UWh9QsKkLj8HWO0qfL=7UK-xtqezcK7OZgew@mail.gmail.com>
Date: Fri, 17 Aug 2012 23:15:09 -0700
X-Google-Sender-Auth: Vw01HheKtbwI4WhcMY8-4VCmXKU
Message-ID: <CAJ-VmokqTt84eawJXypJ9i_rM+9mCM0gtAj-ZzfVUK5-4krDdg@mail.gmail.com>
From: Adrian Chadd <adrian@freebsd.org>
To: freebsd-wireless@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1
Subject: Re: net80211/driver LORs: http://wiki.freebsd.org/WiFiDebugging
X-BeenThere: freebsd-wireless@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Discussions of 802.11 stack,
	tools device driver development." <freebsd-wireless.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-wireless>, 
	<mailto:freebsd-wireless-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-wireless>
List-Post: <mailto:freebsd-wireless@freebsd.org>
List-Help: <mailto:freebsd-wireless-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-wireless>, 
	<mailto:freebsd-wireless-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 18 Aug 2012 06:15:10 -0000

.. so the first LOR is between node table lock and comlock - the
former in ieee80211_timeout_stations() and the latter in
ieee80211_set_tim().

So, something is holding the comlock when the node table lock is being
grabbed. Where is that happening? Would someone like to tackle that
particular issue?

Eg, what about printing out a witness backtrace if the comlock is held
when the node table lock is held? And vice versa? Just to try and
figure out who is holding things incorrectly?


Adrian