Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753631AbZLBJl4 (ORCPT ); Wed, 2 Dec 2009 04:41:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752187AbZLBJlz (ORCPT ); Wed, 2 Dec 2009 04:41:55 -0500 Received: from smtp-out003.kontent.com ([81.88.40.217]:40018 "EHLO smtp-out003.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751366AbZLBJly (ORCPT ); Wed, 2 Dec 2009 04:41:54 -0500 From: Oliver Neukum To: Ondrej Zary Subject: Re: debugging oops after disconnecting Nexio USB touchscreen Date: Wed, 2 Dec 2009 10:42:04 +0100 User-Agent: KMail/1.12.2 (Linux/2.6.32-rc6-0.1-default; KDE/4.3.1; x86_64; ; ) Cc: Alan Stern , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org References: <200912020952.09354.linux@rainbow-software.org> In-Reply-To: <200912020952.09354.linux@rainbow-software.org> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200912021042.04557.oliver@neukum.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 669 Lines: 18 Am Mittwoch, 2. Dezember 2009 09:52:08 schrieb Ondrej Zary: > It shows "prev is NULL, qh=f6581080, ehci->async=f6581000". > > The problem is that activating usbmon causes the problem to disappear. No > errors in maybe 15 attempts. It appeared on 2nd attempt after unloading > usbmon. That suggests a use after free bug, which usbmon prevents holding an additional reference. Are you using SLAB_DEBUG? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/