[Crash-utility] problem with crash on upstream kernel cores

Hello, I'm having a problem using crash on cores generated by upstream kernels (in this case 2.6.20). I'm using crash 4.0-3.20, and I've built my kernel with -g. Whenever I try to open it this is the error I get [root@rh5cluster2 127.0.0.1-2007-02-23-15:09:25]# crash /root/linux-2.6/vmlinux vmcore crash 4.0-3.20 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 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 VA Linux Systems Japan K.K. Copyright (C) 2005 NEC Corporation Copyright (C) 1999, 2002 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: invalid (optional) structure member offsets: zone_struct_free_pages or zone_free_pages FILE: memory.c LINE: 11520 FUNCTION: dump_memory_nodes() [/usr/bin/crash] error trace: 8096dcc => 80baca0 => 80ba076 => 812ee1a /usr/bin/nm: /usr/bin/crash: no symbols /usr/bin/nm: /usr/bin/crash: no symbols /usr/bin/nm: /usr/bin/crash: no symbols /usr/bin/nm: /usr/bin/crash: no symbols WARNING: Because this kernel was compiled with gcc version 4.1.1, certain commands or command options may fail unless crash is invoked with the "--readnow" command line option. [root@rh5cluster2 127.0.0.1-2007-02-23-15:09:25]# file vmcore vmcore: ELF 32-bit LSB core file Intel 80386, version 1 (SYSV), SVR4-style the file is definitely a proper core. I used the --readnow option and that did not help either. Thank you, Josef