From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756855Ab2IFJF2 (ORCPT ); Thu, 6 Sep 2012 05:05:28 -0400 Received: from mga03.intel.com ([143.182.124.21]:46960 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754456Ab2IFJFZ (ORCPT ); Thu, 6 Sep 2012 05:05:25 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,379,1344236400"; d="scan'208";a="142103104" Date: Thu, 6 Sep 2012 17:05:22 +0800 From: Fengguang Wu To: Yinghai Lu Cc: Jiang Liu , Bjorn Helgaas , LKML , linux-pci@vger.kernel.org Subject: Re: PCI/e1000 BUG: unable to handle kernel paging request at 0ffff163 Message-ID: <20120906090522.GA25102@localhost> References: <20120905065118.GA9603@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Sep 05, 2012 at 11:41:04AM -0700, Yinghai Lu wrote: > On Tue, Sep 4, 2012 at 11:51 PM, Fengguang Wu wrote: > > Yinghai, > > > > There are many kernel paging errors showing up in tree: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git for-pci-for-each-res-addon-v2 > > > > The below summary shows that > > > > 1) it's a reliably reproducible bug > > 2) all paging fault happens at address 0ffff163 and in some e1000 functions > > > > I'll try to bisect if the root cause is not obvious to you. (Cannot > > do so for now because there are 3 bisections on the way and I cannot > > afford more..) > > thanks, will check that... Yinghai, I'm very sorry that it's a false report... The root cause is memory corruption by the isdnloop driver: ==> [ 9.345694] isdnloop-ISDN-driver Rev 1.11.6.7 ==> [ 9.347484] isdnloop: (loop0) virtual card added [ 9.348444] bus: 'usb': driver_probe_device: matched device 1-1:2.0 with driver cdc_acm [ 9.349773] bus: 'usb': really_probe: probing driver cdc_acm with device 1-1:2.0 [ 9.350967] cdc_acm 1-1:2.0: This device cannot do calls on its own. It is not a modem. [ 9.353255] cdc_acm 1-1:2.0: ttyACM0: USB ACM device [ 9.354137] BUG: unable to handle kernel paging request at 0ffff163 [ 9.355214] IP: [<0ffff163>] 0xffff162 [ 9.355869] *pde = 00000000 Which was recently fixed by commit 77f00f6324cb97cf1df6f9c4aaeea6ada23abdb2 Author: Wu Fengguang Commit: David S. Miller CommitDate: Fri Aug 3 16:53:22 2012 -0700 isdnloop: fix and simplify isdnloop_init() Fix a buffer overflow bug by removing the revision and printk. Thanks, Fengguang