<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <tt>Bernhard Walle wrote:</tt> <blockquote TYPE=CITE><tt>Hello,</tt><tt></tt> <tt>* Dave Anderson <anderson@redhat.com> [2006-11-08 22:26]:</tt> <tt>> Olaf Hering wrote:</tt> <tt>> > On Wed, Nov 08, Dave Anderson wrote:</tt> <tt>> > > Olaf Hering wrote:</tt> <tt>> > ></tt> <tt>> > > > crash 4.0-3.9 can not read a dump file from an ia64 box running 2.6.5.</tt> <tt>> > > > Is this supposed to work?</tt> <tt>> > > ></tt> <tt>> > > > crash -s boot/System.map-2.6.5-7.267-sn2 boot/Kerntypes-2.6.5-7.267-sn2 dump.3</tt> <tt>> > ></tt> <tt>> > > Well, if it did work, it would be news to me. I've certainly never run crash</tt> <tt>> > > with a "Kerntypes" file as a substitute for a -g built vmlinux file.</tt> <tt>> ></tt> <tt>> > Thats all we have right now. And sadly, I have been told that gcc will</tt> <tt>> > generate different asm depending on what host the kernel is compiled</tt> <tt>> > (memory config etc.). So getting the exact vmlinux again may be a</tt> <tt>> > challenge with gcc3.2.</tt> <tt>></tt> <tt>> Well, that's always been the case, and that's OK. In that case,</tt> <tt>> all you have to do is compile the identical kernel source code</tt> <tt>> with -g, but also pass the System.map file of the "real" dumped</tt> <tt>> vmlinux on the command line, as in:</tt> <tt>></tt> <tt>> # crash vmlinux-rebuilt-with-g System.map-of-dumped-vmlinux dumpfile</tt> <tt>></tt> <tt>> That's the sole purpose of the System.map argument, which should</tt> <tt>> *only* be used in such a case.</tt><tt></tt> <tt>I get this output here:</tt><tt></tt> <tt> # crash ./vmlinux-2.6.5-7.282-debug map.4 dump.4</tt><tt></tt> <tt> crash 4.0-53.1</tt> <tt> Copyright (C) 2002, 2003, 2004, 2005, 2006 Red Hat, Inc.</tt> <tt> Copyright (C) 2004, 2005, 2006 IBM Corporation</tt> <tt> Copyright (C) 1999-2006 Hewlett-Packard Co</tt> <tt> Copyright (C) 2005 Fujitsu Limited</tt> <tt> Copyright (C) 2005 NEC Corporation</tt> <tt> Copyright (C) 1999, 2002 Silicon Graphics, Inc.</tt> <tt> Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.</tt> <tt> This program is free software, covered by the GNU General Public License,</tt> <tt> and you are welcome to change it and/or distribute copies of it under</tt> <tt> certain conditions. Enter "help copying" to see the conditions.</tt> <tt> This program has absolutely no warranty. Enter "help warranty" for details.</tt><tt></tt> <tt> crash: map.4: not a supported file format</tt><tt></tt> <tt> Usage:</tt> <tt> crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist] [dumpfile]</tt><tt></tt> <tt> Enter "crash -h" for details.</tt><tt></tt> <tt>./vmlinux-2.6.5-7.282-debug is a uncompressed kernel image without</tt> <tt>debug information (IA 64), map.4 is a normal System.map file and</tt> <tt>dump.4 is the LKCD dump file.</tt> <tt></tt> </blockquote> <tt>"vmlinux-2.6.5-7.282-debug" must have debug information right? Crash</tt> <tt>will not work without at least one debug-full vmlinux file on the command</tt> <tt>line, and since it works without the map.4, it must be debug-full.</tt> <blockquote TYPE=CITE><tt></tt> <tt>Without the map.4 argument, crash doesn't complain about the file</tt> <tt>formats.</tt></blockquote> <tt>...but the virtual addresses probably don't line up completely?</tt> <blockquote TYPE=CITE><tt></tt> <tt></tt> <tt>Any hints? Thanks!</tt> <tt></tt> </blockquote> <tt>Yes, the "map.4" file did not return successfully from the</tt> <tt>is_system_map() function in symbols.c. That function sanity-checks</tt> <tt>the first 100 entries in the file to verify that there are 3 entries</tt> <tt>in each line, that the the first entry contains a 64-bit hexadecimal</tt> <tt>address, and that the second field contains a single character.</tt><tt></tt> <tt>For example, this is an example of a 2.4 ia64 kernel</tt> <tt>System.map file:</tt><tt></tt> <tt># head /boot/System.map</tt> <tt>0000000004407f20 A phys_start</tt> <tt>e000000000000000 A v</tt> <tt>e000000004400000 A _stext</tt> <tt>e000000004400000 A _text</tt> <tt>e000000004400000 T ia64_ivt</tt> <tt>e000000004400000 t vhpt_miss</tt> <tt>e000000004400400 t itlb_miss</tt> <tt>e000000004400410 t itlb_fault</tt> <tt>e000000004400800 t dtlb_miss</tt> <tt>e000000004400810 t dtlb_fault</tt> <tt>#</tt><tt></tt> <tt>What does "head -100 map.4." show?</tt><tt></tt> <tt>Dave</tt> </html>