From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 28 Nov 2001 23:06:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 28 Nov 2001 23:06:01 -0500 Received: from mtiwmhc21.worldnet.att.net ([204.127.131.46]:20930 "EHLO mtiwmhc21.worldnet.att.net") by vger.kernel.org with ESMTP id ; Wed, 28 Nov 2001 23:05:51 -0500 Message-ID: <3C05B310.4030402@softhome.net> Date: Wed, 28 Nov 2001 23:01:20 -0500 From: Mark Moss User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.5) Gecko/20011012 X-Accept-Language: en-us MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: Kernal Panic while reading loop device. 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 In Kernel 2.5.1-pre3, I receive a kernal panic whenever I execute the following two commands. This panic does not occur in 2.5.1-pre1. The stock kernel has been patched with Alan Cox's pc_keyb.c patch and with the early_printk patch. I don't have time tonite to revert the early_printk patch and see if the panic still happens. If anyone thinks it is relevant, I will try this tomorrow without the early_printk patch. If anyone would like more information, please let me know. Mark Moss kc8dei@softhome.net The commands which generate the panic are: losetup /dev/loop0 /dev/scd0 cat /dev/loop0 /dev/scd0 contains a CD-RW burned using the text "This is a test." as the image. Here is my transcription of the panic message: (Apologies for any write-p's, it was transcribed by hand). --- Unable to handle kernel NULL pointer dereference at virtual address 00000000. printing eip C01865F7 *pde=00000000 Oops: 0002 CPU: 0 EIP: 0010:[] EEFlags: 00010046 eax: 00000000 ebx: 00000200 ecx:00000400 edx: 00000170 esi: C0283158 edi: 00000000 ebp:C0283158 esp: C022bcc4 dsi: 0018 esi:0018 ss:0018 Process Swapper CPU:0 Stackpage (022b0000) Stack: 0000000C 00000003 00000801 C0283158 00000000 C0283158 C018671E C0283158 00000000 00000200 00000800 C0CD16E0 00000000 C886D12C C0283158 00000000 00000800 C0CD16C0 00000800 00000800 C0283158 C886D66D C0283158 C0CD1600 Call Trace: C018671E C886D12E C886D66D C8825730 C886D4B0 C0188078 C0181FA0 C0108378 C01053B0 C010A3E9 C01053B0 C01053D3 C0105452 C0105000 Code: F3 66 6D 5B 5E 5B 5E 5F 5D C3 EB 0D 90 90 90 90 90 90 90 90 <0> Kernel Panic: Proc Killing Interrupt Handler! In Interrupt Handler - not syncing --- Modules Loaded: sg ide-scsi sr_mod cdrom smbfs 3c95x usb-uhci nls-iso8859-1 nls-cp437 msdos fat Dump of SCSI Bus: Attached Devices Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: MITSUMI Model: CR-4804-TE Rev: 2.4C Type: CD-ROM ANSI SCSI revision 02.