[Crash-utility] problem with crash utility in ubuntu

Hi , I have tried to use crash 4.1.0 in ubuntu 10.04 kernel (2.6.32.25), when I don't specify the memory dump file ,it works perfectly as it reads the memory from crash driver (crash model), it shows below: root@o:/# crash /boot/System.map-2.6.32-25-generic /home/amer/ubuntu-lucid/debian/build/build-generic/vmlinux crash 4.1.0 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb 6.1 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "i686-pc-linux-gnu"... SYSTEM MAP: /boot/System.map-2.6.32-25-generic DEBUG KERNEL: /home/amer/ubuntu-lucid/debian/build/build-generic/vmlinux (2.6.32-25-generic) DUMPFILE: */dev/crash * CPUS: 1 DATE: Wed Feb 23 11:40:40 2011 UPTIME: 09:17:34 LOAD AVERAGE: 0.89, 0.74, 0.78 TASKS: 258 NODENAME: o RELEASE: 2.6.32-25-generic VERSION: #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 MACHINE: i686 (1339 Mhz) MEMORY: 511.5 MB PID: 2703 COMMAND: "crash" TASK: cf27bfc0 [THREAD_INFO: dfbc0000] CPU: 0 STATE: TASK_RUNNING (ACTIVE) * but when I entered the dump file argument I got error (the memory image is obtained from /dev/crash by dd tool), it shows below: * root@o:/# crash /boot/System.map-2.6.32-25-generic /home/amer/ubuntu-lucid/debian/build/build-generic/vmlinux home/amer/image.dd crash 4.1.0 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005 NEC Corporation Copyright (C) 1999, 2002, 2007 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. *crash: home/amer/image.dd: not a supported file format * Usage: crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist] [dumpfile] Enter "crash -h" for details. could you please give some advice to resolve this problem. Thanks, amer