[Crash-utility] crash fails to load compressed RHEL5 vmcore

[marc pascual]

Hello,

I have this issue with compressed RHEL5 vmcore files, I can't get it to
loaded to the crash utility. I don't have this problem with RHEL4 vmcores
(diskdump).
The debuginfo kernel exactly matches the kernel version that generated the
vmcore

[root at test-fc12 ~]# crash
>  usr/lib/debug/lib/modules/2.6.18-92.1.10.el5debug/vmlinux
> /nas01/cores/2.6.18-92.1.10.el5.vmcore
>
> crash 4.0.9-2.fc12
> Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009  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, 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 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 "x86_64-unknown-linux-gnu"...
>
> crash: page excluded: kernel virtual address: ffffffff804f1260  type:
> "possible"
> WARNING: cannot read cpu_possible_map
> crash: usr/lib/debug/lib/modules/2.6.18-92.1.10.el5debug/vmlinux and
> /nas01/cores/2.6.18-92.1.10.el5.vmcore do not match!
>
> Usage:
>  crash [-h [opt]][-v][-s][-i file][-d num] [-S] [mapfile] [namelist]
> [dumpfile]
>
> Enter "crash -h" for details.
>

[root at test-fc12 ~]# strings
> usr/lib/debug/lib/modules/2.6.18-92.1.10.el5debug/vmlinux | grep 2.6 | head
> -2
> Linux version 2.6.18-92.1.10.el5debug (
> brewbuilder at ls20-bc2-13.build.redhat.com) (gcc version 4.1.2 20071124 (Red
> Hat 4.1.2-42)) #1 SMP Wed Jul 23 04:27:38 EDT 2008
> 2.6.18-92.1.10.el5debug SMP mod_unload gcc-4.1
>

running strings on the rhel5 vmcore file:

[root at test-fc12 cores]# strings 2.6.18-92.1.10.el5.vmcore | grep 2.6 | head
> -2
> 2X6
> 2T6(
>

does makedumpconfig's compression have something to do with this? from
kdump.conf on the machine where i got that vmcore:

...
> core_collector makedumpfile -c -d31
> ...
>

Thank you in advace!

Regards,
Marc
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