From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263141AbTJJXBU (ORCPT ); Fri, 10 Oct 2003 19:01:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263151AbTJJXBU (ORCPT ); Fri, 10 Oct 2003 19:01:20 -0400 Received: from fw.osdl.org ([65.172.181.6]:36770 "EHLO mail.osdl.org") by vger.kernel.org with ESMTP id S263141AbTJJXBQ (ORCPT ); Fri, 10 Oct 2003 19:01:16 -0400 Date: Fri, 10 Oct 2003 15:52:08 -0700 From: "Randy.Dunlap" To: "Amir Hermelin" Cc: linux-kernel@vger.kernel.org Subject: Re: Format of an 'oops' call trace (in show_trace) Message-Id: <20031010155208.4705ef26.rddunlap@osdl.org> In-Reply-To: <028001c38e89$a5ca7b00$1401a8c0@CARTMAN> References: <20031008100603.53c1cf75.rddunlap@osdl.org> <028001c38e89$a5ca7b00$1401a8c0@CARTMAN> Organization: OSDL X-Mailer: Sylpheed version 0.9.4 (GTK+ 1.2.10; i686-pc-linux-gnu) X-Face: +5V?h'hZQPB9kW Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Install ksymoops. Its man page has info on module debugging and ooops reporting. ~Randy On Thu, 9 Oct 2003 19:20:28 +0200 "Amir Hermelin" wrote: | Thanks Randy. | | Since the information doesn't tell me much other than which function | dropped, is there any way I could get more than a hunch of where the fault | occurred, assuming this is a loadable module? | | Thanks, | Amir. | | | | -----Original Message----- | From: Randy.Dunlap [mailto:rddunlap@osdl.org] | Sent: Wednesday, October 08, 2003 7:06 PM | To: Amir Hermelin | Cc: linux-kernel@vger.kernel.org | Subject: Re: Format of an 'oops' call trace (in show_trace) | | | On Wed, 8 Oct 2003 13:25:44 +0200 "Amir Hermelin" wrote: | | | Oops, | | I forgot that part :) It's RH 2.4.20-8 | | | | Thanks, | | Amir. | | | | | | On Tue, 7 Oct 2003 17:56:38 +0200 "Amir Hermelin" | | wrote: | | | | | Hi, | | | Can someone please point me to a description of what I see in the | | | Call | | | of the oops dump? I tried looking into show_trace and lookup_symbol | | | functions, but I couldn't understand some things. For example, in | | | this following trace: | | The basic format (in RH 2.4.20-8) is: | | [
] symbol_name [module_name] 0xoffset_from_symbol (where address is | on stack) | | offset_from_symbol is hex bytes from symbol to
, so 0x0 is an exact | match. | | | | joji kernel: [] reqrdata [mymod] 0x0 (0xd5543fb4)) joji | | | kernel: [] mymod [mymod] 0x0 (0xd5543fe0)) | | | | I don't understand the relevance to reqrdata (since it's not a | | | function, | | but | | | a data structure, and isn't the parameter to the mymod function). | | It looks for any addresses in the kernel text (code) space and tries to find | symbol names for them. | | | | And could | | | someone please explain what the 0x0 in the lines mean? From the code | | | I understood it to be the offset of the symbol within the module, | | | but that can't be right if both symbols translate to the same offset | | | - so I must've understood it wrong. | | See above. | | | | joji kernel: printing eip: | | | joji kernel: e01b090b | | | joji kernel: *pde = 00000000 | | | joji kernel: Oops: 0002 | | | joji kernel: CPU: 0 | | | joji kernel: EIP: 0060:[] Not tainted | | | joji kernel: EFLAGS: 00010282 | | | joji kernel: | | | joji kernel: EIP is at rtp_recv [mymod] 0x5b (2.4.20-8custom) | | | joji kernel: eax: 00000000 ebx: d5542000 ecx: 00000001 | | | edx: c0374c88 | | | joji kernel: esi: e01bae00 edi: d76aa400 ebp: d5543fcc | | | esp: d5543f98 | | | joji kernel: ds: 0068 es: 0068 ss: 0068 | | | joji kernel: Process mymod (pid: 6978, stackpage=d5543000) | | | | | joji kernel: Stack: e01bae00 d76aa400 d5542000 00000000 d76aa400 | | | ffffffff e01a5308 e01bae00 | | | joji kernel: d76aa400 d5543fcc d5542000 d5542000 | | | dbd15900 00000000 d54f3fd0 d5533fd0 | | | joji kernel: d5542000 00000000 e01a5220 00000000 | | | 00000000 00000000 c010742d d76aa400 | | | joji kernel: Call Trace: | | | [] reqrdata [mymod] 0x0 (0xd5543f98)) | | | joji kernel: [] mymod [mymod] 0xe8 (0xd5543fb0)) | | | | | joji kernel: [] reqrdata [mymod] 0x0 (0xd5543fb4)) | | | | | | joji kernel: [] mymod [mymod] 0x0 (0xd5543fe0)) joji | | | kernel: [] kernel_thread_helper [kernel] 0x5 (0xd5543ff0)) | | HTH. | | -- | ~Randy