Debugging the linux kernel core dump

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Hello,

I have a core dump from following machine :

# uname -a
Linux sing-vto2-dst 2.6.34.8-0.2-desktop #1 SMP PREEMPT 2011-04-06 18:11:26 +0200 x86_64 x86_64 x86_64 GNU/Linux

I have opened this core in gdb

# gdb vmlinux-2.6.34.8-0.2-desktop kernel.core0
GNU gdb 6.6 (build 2009-10-05)
Copyright (C) 2006 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.
(no debugging symbols found)
Program terminated with signal 11, Segmentation fault.
#0  0xffffffff8100ba60 in default_idle ()


How can I add symbols to gdb ?
When I try to add symbols from System.map I get following error :

(gdb) add-symbol-file System.map-2.6.34.8-0.2-desktop
The address where System.map-2.6.34.8-0.2-desktop has been loaded is missing


At what address should the System.map be added ? How can I find out that address ?

Thanks for any help.

Akash
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