Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932110AbVKWRt7 (ORCPT ); Wed, 23 Nov 2005 12:49:59 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932113AbVKWRt7 (ORCPT ); Wed, 23 Nov 2005 12:49:59 -0500 Received: from prgy-npn2.prodigy.com ([207.115.54.38]:60217 "EHLO oddball.prodigy.com") by vger.kernel.org with ESMTP id S932110AbVKWRt6 (ORCPT ); Wed, 23 Nov 2005 12:49:58 -0500 Message-ID: <4384AAED.3070804@tmr.com> Date: Wed, 23 Nov 2005 12:46:21 -0500 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.11) Gecko/20050729 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ashutosh Naik , Linux Kernel Mailing List Subject: Re: Over-riding symbols in the Kernel causes Kernel Panic References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1469 Lines: 34 Ashutosh Naik wrote: > Hi, > > I made e1000 ( or for that matter anything) a part of the 2.6.15-rc1 > kernel and booted the kernel. Next I compiled e1000 as a module ( > e1000.ko ), and tried to insmod it into the kernel( which already had > e1000 a compiled as a part of the kernel). I observed that > /proc/kallsyms contained two copies of all the symbols exported by > e1000, and I also got a Kernel Panic on the way. > > Is this behaviour natural and desirable ? No, trying to insert a module into a kernel built with the functionality compiled in is a vile perverted act, and probably illegal in Republican states! ;-) The other day I mentioned that reiser4 will find bugs because people will do bizarre things with it when it is more widely used. I think you have hit a "no one would ever do that" bug in the module loader, and demonstrated my point in the process. The panic isn't desirable, but I'm not sure what "correct behaviour" would be, I can't imagine that this is intended to work. The issues of removing such a module gracefully are significant. -- -bill davidsen (davidsen@tmr.com) "The secret to procrastination is to put things off until the last possible moment - but no longer" -me - 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/