[Crash-utility] how to analyze a 32bit dump with a 64bit crash

[Dave Anderson]

Ming Zhang wrote:

> On Tue, 2007-03-27 at 10:17 -0500, Dave Anderson wrote:
> > Ming Zhang wrote:
> > > Hi All
> > >
> > > My laptop has 64bit fc6 and crash utility. One of the development
> > > machine is 32bit RHEL4. whenever i try to open the dump generated
> > > by
> > > that box, I got a unknown format error. i can analyze the dump with
> > > the
> > > crash from that RHEL4, and also my laptop can analyze the dump from
> > > another 64bit RHEL4.
> > >
> > > so my question is how to allow the crash in a 64bit box to open a
> > > dump
> > > from a 32bit box?
> > >
> > > Thanks!
> > >
> > > Ming
> > >
> > >
> > >
> > Try copying a 32-bit crash utility to the 64-bit laptop,
> > and running it from there.
>
> i thought about this. could u enlighten us why single crash cannot do
> that? implementation limitation or more deeper reason?
>

Most definitely an implementation limitation.  The source only
builds in the machine-specific source code based upon the
host machine type.

>
> >
> > Here's an example:
> >
> > # uname -m
> > x86_64
> > # file ./crash
> > ./crash: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for
> > GNU/Linux 2.2.5, dynamically linked (uses shared libs), not stripped
> > # ./crash /tmp/vm*
> >
> > crash 4.0-3.21
> > 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, 2007  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"...
> >
> >       KERNEL: /tmp/vmlinux
> > DEBUG KERNEL: /tmp/vmlinux-2.4.21-1.1931.2.421.ent.debug
> >     DUMPFILE: /tmp/vmcore
> >         CPUS: 1
> >         DATE: Tue Sep  9 18:02:05 2003
> >       UPTIME: 05:04:13
> > LOAD AVERAGE: 9.96, 10.56, 10.89
> >        TASKS: 72
> >     NODENAME: moe.lab.boston.redhat.com
> >      RELEASE: 2.4.21pre1
> >      VERSION: #3 Tue Sep 9 14:13:17 EDT 2003
> >      MACHINE: i686  (501 Mhz)
> >       MEMORY: 128 MB
> >        PANIC: "Oops: 0002" (check log for details)
> >          PID: 3701
> >      COMMAND: "sh"
> >         TASK: c791c000
> >          CPU: 0
> >        STATE: TASK_RUNNING (PANIC)
> >
> > crash>
> >
> > Dave
> >