[Crash-utility] Error when running crash utility - crash: read error: kernel virtual address: c1399f10 type: "xtime"

[Mani]

Hello,

I am trying to analyse the dump created by the kdump utility. This is what I
did
I took 2.6.25.14 vanilla version of kernel and made two copies of the kernel
named vmlinuz-2.6.25.14-main (Production kernel)  and
vmlinuz-2.6.25.14-kdump (Crash kernel) by following the procedure mentioned
in the following website
*http://www.dedoimedo.com/computers/kdump.html*

When I run crash utility using the following command
*crash /usr/src/linux-2.6.25.14-main/vmlinux
/var/crash/2009-08-08-23:32/vmcore*

I get the following error
*
crash /usr/src/linux-2.6.25.14-main/vmlinux
/var/crash/2009-08-08-23:32/vmcore

crash 4.0-6.0.5
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008  Red Hat, Inc.
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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,
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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
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Type "show copying" to see the conditions.
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This GDB was configured as "i686-pc-linux-gnu"...

crash: read error: kernel virtual address: c1399f10  type: "xtime"

*
I checked for the error and found this link which mentions few
work-around/fixes for the issue with reading of /dev/mem
*http://www.mail-archive.com/crash-utility@redhat.com/msg01553.html*

I tried adding CONFIG_STRICT_DEVMEM to the .config file (This parameter was
not already present in the config file)
I got the following error while compiling the kernel

*scripts/kconfig/mconf arch/x86/Kconfig
.config:3869:warning: trying to assign nonexistent symbol STRICT_DEVMEM*

I tried to create the kretprobe module, it works fine for do_fork() but when
I give devmem_is_allowed() as the functioin name I get the following error

*[root at buzzsaw kprobes]# insmod kretprobe_devmem.ko
insmod: error inserting 'kretprobe_devmem.ko': -1 Operation not permitted*

I am new to the area of kernel debugging. Please let me know how I can solve
this issue. Thanks

-- 
Regards,
Mani
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