Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264214AbUDHIzW (ORCPT ); Thu, 8 Apr 2004 04:55:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264221AbUDHIzV (ORCPT ); Thu, 8 Apr 2004 04:55:21 -0400 Received: from cimice4.lam.cz ([212.71.168.94]:29320 "EHLO beton.cybernet.src") by vger.kernel.org with ESMTP id S264214AbUDHIzT (ORCPT ); Thu, 8 Apr 2004 04:55:19 -0400 Date: Thu, 8 Apr 2004 08:55:18 +0000 From: =?iso-8859-2?Q?Karel_Kulhav=FD?= To: linux-kernel@vger.kernel.org Subject: cat /dev/hdb > /dev/null DoS Message-ID: <20040408085518.B4607@beton.cybernet.src> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i X-Orientation: Gay Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 819 Lines: 25 Hello I have 2.8 GHz Pentium IV with 1GB RAM and 250GB ATA-133 IDE disk on /dev/hdb. I did cat /dev/hdb > /dev/null and after a while (5 minutes), the system went totally unresponsive: 1) man top takes 3 minutes to display man page 2) Switching between console and X takes also a couple of minutes 3) top shows this: Cpu(s): 1.4% us, 1.4% sy, 0.0% ni, 0.0% id, 0.0% wa, 97.3% hi, 0.0% si /dev/hdb is auxilliary disk that is not used, is not mounted and the root filesystem doesn't reside on it (of course). Kernel version is 2.6.3. Is this behaviour normal? Cl< - 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/