Problem opening core file.

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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.

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