Hi,
>
> Well, that's your first mistake...
>
Thanks for pointing it out :)
..
[snip]
..
> Like the error message indicates, the vmlinuz-2.6.32.12-crash-crash
> file is not a supported file format. Never has been, never will
> be...
>
I tried with vmlinux and it seems ok. But got another error
hltncra110731:/home/adil # crash linux-2.6.32.12-0.7/vmlinux
/var/crash/2012-02-08-14\:13/vmcore
--------------------
crash 5.0.1
Copyright (C) 2002-2010 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: seek error: kernel virtual address: ffffffff81827aa0 type:
"kernel_config_data"
WARNING: cannot read kernel_config_data
crash: seek error: kernel virtual address: ffffffff8181a660 type:
"cpu_possible_mask"
hltncra110731:/home/adil #
----------------------------------
> Also, do yourself a favor, and upgrade your crash utility version
> from crash-5.0.1, which is two years old.
I am using for learning purpose. So i guess this version should be Ok
to use for learning purpose.
No, that's really not true. crash-5.0.1 is two years old, which is ancient
by crash standards. And it's very easy to upgrade:
$ wget
...
$ cd crash-6.0.3
$ make
...
$
As far as the "seek errors" you're seeing, I don't know what's
happening,
other than crash can't find the physical address page associated with those
unity-mapped kernel virtual addresses in the vmcore. But I'm sorry -- I don't
spend time debugging issues encountered with obsolete crash versions. If you
can upgrade, and then post the output of:
$ crash -d8 linux-2.6.32.12-0.7/vmlinux /var/crash/2012-02-08-14\:13/vmcore
there will be a plethora of debug output that can help determine the
problem.
Dave