[Crash-utility] Problem opening core file.

Greetings, I am trying to open a core file but getting following error. I am sure that I am using right kernel + kernel-debuginfo package. As following command on crash log shows version on kernel in use. # cat crash-log | grep -i 2.4.21 EIP is at check_pgt_cache [kernel] 0x19 (2.4.21-47.ELsmp) ----------------------------------------snip-from-system-on-which-i-am-opening-core-file----------------------------------------- # uname -r 2.4.21-47.ELsmp # crash /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug /boot/vmlinux-2.4.21-47.ELsmp case_1843132_vmcore crash 4.0-6.3 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 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"... WARNING: invalid value: smp_num_cpus: -1070037996 crash: /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug and case_1843132_vmcore do not match! Usage: crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist] [dumpfile] Enter "crash -h" for details. ----------------------------------------snip-from-system-on-which-i-am-opening-core-file----------------------------------------- Question: Why am I getting following message if I am using right set of packages. crash: /usr/lib/debug/boot/vmlinux-2.4.21-47.ELsmp.debug and case_1843132_vmcore do not match! Any help would be greatly appreciated. Rohit.