From owner-freebsd-stable@FreeBSD.ORG Mon Sep 29 00:46:17 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D2E171065686 for ; Mon, 29 Sep 2008 00:46:17 +0000 (UTC) (envelope-from bms@incunabulum.net) Received: from out2.smtp.messagingengine.com (out2.smtp.messagingengine.com [66.111.4.26]) by mx1.freebsd.org (Postfix) with ESMTP id A9CAD8FC1E for ; Mon, 29 Sep 2008 00:46:17 +0000 (UTC) (envelope-from bms@incunabulum.net) Received: from compute2.internal (compute2.internal [10.202.2.42]) by out1.messagingengine.com (Postfix) with ESMTP id 4C81916E998 for ; Sun, 28 Sep 2008 20:46:17 -0400 (EDT) Received: from heartbeat2.messagingengine.com ([10.202.2.161]) by compute2.internal (MEProxy); Sun, 28 Sep 2008 20:46:17 -0400 X-Sasl-enc: z4NPWx5dP+yXxEqaxRadCgsqUCfFCfnI2HuGa/xTDs08 1222649177 Received: from empiric.lon.incunabulum.net (82-35-112-254.cable.ubr07.dals.blueyonder.co.uk [82.35.112.254]) by mail.messagingengine.com (Postfix) with ESMTPSA id E17053B140 for ; Sun, 28 Sep 2008 20:46:16 -0400 (EDT) Message-ID: <48E02557.2020303@incunabulum.net> Date: Mon, 29 Sep 2008 01:46:15 +0100 From: Bruce M Simpson User-Agent: Thunderbird 2.0.0.14 (X11/20080514) MIME-Version: 1.0 To: FreeBSD stable X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: USB detach/attach hangs with 7.0-RELEASE and 7.1-PRERELEASE X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 29 Sep 2008 00:46:17 -0000 Hi, I've noticed some general instability with plugging in or removing USB devices with FreeBSD 7.x, even when the devices are not actively in use. I had this happen with umass and ucom devices 3 times today. The machine hangs solid, there are no obvious signs of a panic or trap to DDB. I can't provide backtraces unfortunately -- these hangs happen on both my laptop and desktop, and I usually have X running -- if I had more specific information, I'd open a PR. Again, there seems to be no reason why this should happen, the devices are off-the-shelf consumer items known to work with existing drivers, and have been repeatedly used in other OSes without these hangs happening; consider this an "anecdotal report". [For some reason my IBM laptop will often not allow me to break into DDB on a driver related panic, and will just immediately reboot -- I lack free time to track down exactly why this could be. My desktop has a USB keyboard and this appears not to be supported by DDB, I ordered a PS/2 keyboard which hasn't arrived, but that's another story.] thanks BMS