[Crash-utility] Crash Setup

Hi, I am new to crash utility. I want to run crash ( crash 4.0-2.18.1) on dual-core AMD Opteron (x86_64) cluster. The cluster nodes are running xen 3.0 the proc/version gives the following output : 2.6.16.13-xen i am running xen 3.0 which has been installed on fc5. I guess the kernel was not built with debugging info on Running crash gives the following output: crash 4.0-2.18.1 Copyright (C) 2002, 2003, 2004, 2005, 2006 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005 Fujitsu Limited Copyright (C) 2005 NEC Corporation Copyright (C) 1999, 2002 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. WARNING: cannot read linux_banner string crash: /boot/vmlinux-syms-2.6.16.13-xen and /dev/mem do not match! I read up on the previous threads that this is because /dev/mem returns all zereos. I think I need something like a patch for installing the /dev/crash module. I am new to this so can anyone help me out with a detailed procedure of what needs to be done. Thank You. Aditya Krishnan