From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262801AbTJULLP (ORCPT ); Tue, 21 Oct 2003 07:11:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262927AbTJULLP (ORCPT ); Tue, 21 Oct 2003 07:11:15 -0400 Received: from MAIL.13thfloor.at ([212.16.62.51]:9615 "EHLO mail.13thfloor.at") by vger.kernel.org with ESMTP id S262801AbTJULLN (ORCPT ); Tue, 21 Oct 2003 07:11:13 -0400 Date: Tue, 21 Oct 2003 13:11:12 +0200 From: Herbert Poetzl To: Emmanuel Fleury Cc: linux-kernel@vger.kernel.org Subject: Re: Unable to handle kernel... Message-ID: <20031021111112.GC4663@DUK2.13thfloor.at> Mail-Followup-To: Emmanuel Fleury , linux-kernel@vger.kernel.org References: <1065623368.15369.35.camel@rade7.s.cs.auc.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1065623368.15369.35.camel@rade7.s.cs.auc.dk> User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 08, 2003 at 04:29:28PM +0200, Emmanuel Fleury wrote: > Hi, > > I am pretty new in coding for the kernel and I was wandering what is the > _deep_ meaning of: > > "Unable to handle kernel paging request at virtual address XXXX" some page was requested, (probably via a pointer dereference, read or write), which led to a page fault, which in turn could not be satisfied by loading/providing the requested page, because it simply isn't there (usually wrong address) > and > "Unable to handle kernel NULL pointer dereference". some pointer (value = NULL) was dereferenced, which should be considered an error, this caused the oops which (probably) follows those lines (reg/stackdump) int *test = NULL; int v = test[0]; // bad! > If somebody could explain this to me, I would be very pleased ! :) probably there are better explanations, HTH, Herbert > PS: I know already how to trace an Oops by using ksymoops. But these two > errors are puzzling me and I would like to understand more about it. > > Regards > -- > Emmanuel > > The tradition of open science has done more to build the modern > economy than Microsoft ever will. > -- Linus Torvalds > > - > 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/