[Crash-utility] Question about: crash: seek error: kernel virtual address: c1625ccc type: "cpu_possible_mask"

Hi, I am using KDUMP tools(version: 2.0.4) to capture kernel panic information. I configured the kernel compile para according to the kdump-tutorial, and get dump file in /var/crash/ through echo c > /proc/sysrq-trigger. but when I analyze the dump file using command: crash -d8 vmlinux dumpfile error happens as following: crash: seek error: kernel virtual address: c1625ccc type: "cpu_possible_mask" The more log can be seen in the attachment: crash.log Otherwise, I found the size of dump file(dump-incomplete) is about 25M, but my memory is 4G. why the dump file is so small? My linux version is linux Mint15, basing on Ubuntu, the kernel version is 3.8.13. v10@COS-Desktop ~ $ v10@COS-Desktop ~ $ cat /proc/cmdline BOOT_IMAGE=/boot/vmlinuz-3.8.13.13-cos-i686 root=UUID=c0bd0f62-0dfa-4425-8afa-b5ff8a00df5c ro crashkernel=384M-2G:64M,2G-:128M quiet splash v10@COS-Desktop ~ $ v10@COS-Desktop ~ $ cat /var/crash/kexec_cmd /sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-3.8.13.13-cos-i686 root=UUID=c0bd0f62-0dfa-4425-8afa-b5ff8a00df5c ro quiet splash irqpoll maxcpus=1 nousb " --initrd=/boot/initrd.img-3.8.13.13-cos-i686 /boot/vmlinuz-3.8.13.13-cos-i686 v10@COS-Desktop ~ $ v10@COS-Desktop ~ $ other log: v10@COS-Desktop ~ $ sudo crash --minimal kdump/0211/vmlinux /var/crash/201402120848/dump-incomplete [sudo] password for v10: 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"... NOTE: minimal mode commands: log, dis, rd, sym, eval, set, extend and exit crash> crash> crash>rd linux_banner 30 rd: seek error: kernel virtual address: c1622080 type: "32-bit KVADDR" crash> crash> crash> I appreciate your help. Thanks!