<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> Vivek Goyal wrote: <blockquote TYPE=CITE>Hi Dave, I can't open vmcore for 2.6.20-rc2 vanilla kernel with crash. I am using latest crash version 4.0-3.16. ****************************************************************************** crash 4.0-3.16 Copyright (C) 2002, 2003, 2004, 2005, 2006 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"... WARNING: invalid linux_banner pointer: 756e694c crash: vmlinux and vmcore do not match! </blockquote> <tt>Hi Vivek,</tt><tt></tt> <tt>It has to do with how the linux_banner symbol is declared. The crash code</tt> <tt>in question does this:</tt> <tt></tt> <tt></tt> <tt> if (!(sp = symbol_search("linux_banner")))</tt> <tt> error(FATAL, "linux_banner symbol does not exist?\n");</tt> <tt> else if (sp->type == 'R')</tt> <tt> linux_banner = symbol_value("linux_banner");</tt> <tt> else</tt> <tt> get_symbol_data("linux_banner", sizeof(ulong), &linux_banner);</tt><tt></tt> <tt> if (!IS_KVADDR(linux_banner))</tt> <tt> error(WARNING, "invalid linux_banner pointer: %lx\n",</tt> <tt> linux_banner);</tt><tt></tt> <tt>Up until 2.6.20-rc2 (apparently), if the linux_banner symbol</tt> <tt>was in the readonly section ('R'), the string data was located</tt> <tt>at the address of the linux_banner symbol. Otherwise, the</tt> <tt>linux_banner symbol contained the address of the string data.</tt><tt></tt> <tt>In your kernel, what does "nm -Bn vmlinux | grep linux_banner" show?</tt> <tt>Maybe 'r' instead of 'R'?</tt><tt></tt> <tt>In any case, it should be easy enough to deal with, because you</tt> <tt>can see the string data is at the location of the linux_banner</tt> <tt>symbol:</tt><tt></tt> <tt>> WARNING: invalid linux_banner pointer: 756e694c</tt><tt></tt> <tt>and that's the string data instead of a pointer to the string</tt> <tt>data:</tt><tt></tt> <tt> crash> ascii 756e694c</tt> <tt> 756e694c: Linu</tt> <tt> crash></tt><tt></tt> <tt>Dave</tt> <tt></tt> <tt></tt> <tt></tt> <tt></tt> <tt></tt> <tt></tt> </html>