On Fri, Aug 5, 2011 at 10:53 AM, Akash [off-list ref] wrote:

I think it was not built with -g otherwise the symbols would have been there
in the vmlinux itself, right ?

Right.

That is the reason I need to add symbols externally.
Please dont ask me to rebuild the kernel, this is vanilla OpenSUSE 11.3
symbols and debug kernel should be available somewhere. I just need to know
how/where to add the symbols. The problem is not reproducible, I need to
debug the core which I have on hand.

Thanks.
Akash

I "think" System.map file is not the file which gbd understands , On
my system, i tried this:
goon:/boot # gdb -q
(gdb) symbol-file System.map-2.6.32.12-0.7-default -readnow
`/boot/System.map-2.6.32.12-0.7-default': can't read symbols: File
format not recognized.

I might be missing something else as well.

-Amit

On Thu, Aug 4, 2011 at 10:19 PM, amit mehta [off-list ref] wrote:

quoted

Not sure about the symbol table, but was your kernel compiled
with -g flag (-g to the CFLAGS variable in the kernel Makefile) ?

-Amit

On Fri, Aug 5, 2011 at 10:42 AM, Akash [off-list ref] wrote:

quoted

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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