From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 2 May 2002 09:21:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 2 May 2002 09:21:35 -0400 Received: from h24-68-93-250.vc.shawcable.net ([24.68.93.250]:57984 "EHLO me.bcgreen.com") by vger.kernel.org with ESMTP id ; Thu, 2 May 2002 09:21:34 -0400 Message-ID: <3CD13D58.7020000@bcgreen.com> Date: Thu, 02 May 2002 06:21:28 -0700 From: Stephen Samuel Organization: Just Another Radical User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0+) Gecko/20020427 X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Userspace proglem [Fwd: Re: A CD with errors (scratches etc.) blocks the whole system while reading damadged files] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Xavier Bestel > > Le jeu 02/05/2002 à 10:26, Stephen Samuel a écrit : >> I ran a similar type of test on a 2.4.9.31 (redhat 7.1 ) kernel. >> With the CD on HDD, I could read off of HDA just peachy while >> the system was choking on a scratched (aol) cd. > > The "system grinding to a halt" happens to me too, when *ripping* > scratched cds. Note that it's when using *userspace* access to the block > device, with e.g. cdparanoia or grip (or dvd ripping tools). > > My DVD drive is on a VT82C693A/694x (ABit VP6). A very important distinction. I'm not willing to sacrifice any of my music CDs to the experiment, but if userspace reads are what block the whole system, that explains why everybody claims that everybody else is crazy. All of my tests have been pure kernel-space (fs) accesses, This is probably why I haven't seen any blockages. Moral of the story: don't rip scratched CDs on server boxes (at least -- nut until this is fixed, anyways). -- Stephen Samuel +1(604)876-0426 samuel@bcgreen.com http://www.bcgreen.com/~samuel/ Powerful committed communication, reaching through fear, uncertainty and doubt to touch the jewel within each person and bring it to life.