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. 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"... 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@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