Hi, list.
 
 I use crash-utility to analyse crash dump core from ARM soc. When I
 execute command below, I get the error "crash: read error: kernel
 virtual address: c0c1e040  type: "first vmap_area va_start"". I also
 test it by gdb. It works fine. The Linux kernel's version is v3.0.8.
 
 hfli@pc1935:~/work/crash-utility$ ./crash vmlinux Vmcore
 
 crash 6.1.4
 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 "--host=i686-pc-linux-gnu
--target=arm-elf-linux"...
 
 crash: read error: kernel virtual address: c0c1e040  type: "first vmap_area
va_start"
 
 Errors like the one above typically occur when the kernel and memory source
 do not match.  These are the files being used:
 
       KERNEL: vmlinux
     DUMPFILE: Vmcore 
You've answered your own question -- you should always see errors if the vmlinux 
kernel does not match the kernel crashed system. 
If you cannot find/access the original vmlinux file that was being run
by the crashed kernel, then get the /boot/System.map file of the crashed
kernel, and enter it on the command line:
 $ crash vmlinux Vmcore System.map
The crash utility will replace all of the invalid symbol values from the
"wrong" vmlinux file with their correct values from the System.map file.
Dave