Hi , Sorry about re posting this as i did not find solution ... I m facing a issue where on #crash /data/linux-2.6.30.8/vmlinux /proc/vmcore crash 6.1.6 Copyright (C) 2002-2013 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011 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) 7.3.1 Copyright (C) 2011 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 "i686-pc-linux-gnu"... crash: read error: kernel virtual address: c127a9c8 type: "cpu_possible_mask" I did follow few threads around , I have a case similar to https://www.redhat.com/archives/crash-utility/2010-August/msg00029.html Both the System Kernel and the Debug Kernel are the same. My current config for CONFIG_PHYSICAL_START=0x1000000 CONFIG_RELOCATABLE=y CONFIG_PHYSICAL_ALIGN=0x400000 The /proc/kallsyms is diffrent between the System Kernel and Debug Kernel. On the System Kernel it starts from 0x400000 .On the Debug kernel it starts from 0x1000000 . if i change the CONFIG_PHYSICAL_START=0x400000 . It does NOT core dump. my crashkernel=128M is the setting on grub. Let me know if you need more info Anand
