[Crash-utility] Redhat 5.11 dump

Hi, A production machine with Red Hat Enterprise Linux Server release 5.11 (Tikanga) kernel 2.6.18-431.el5 crashed. I received vmcore, Since I dont have access to machine, and I need to open the vmcore to analyze the dump, I have downloaded CentOS 5.11, since centos 5.11 is EOL, I downloaded the 2.6.18-431.el5 kernel manually, with debuginfo and debuginfo-common and installed them, so far - seems ok. I am trying to get call stack of the dump time, i get error: [root@centos511test kernel]# crash vmcore /usr/lib/debug/lib/modules/`uname -r`/vmlinux crash 5.1.8-3.el5.centos Copyright (C) 2002-2011 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 (GDB) 7.0 Copyright (C) 2009 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-unknown-linux-gnu"... crash: page excluded: kernel virtual address: ffffffff804d3ae0 type: "possible" WARNING: cannot read cpu_possible_map crash: page excluded: kernel virtual address: ffffffff804735e0 type: "present" WARNING: cannot read cpu_present_map crash: page excluded: kernel virtual address: ffffffff8046e260 type: "online" WARNING: cannot read cpu_online_map crash: page excluded: kernel virtual address: ffffffff80475210 type: "xtime" [root@centos511test kernel]# Any thoughts ? how can I continue ? Thanks alot