Re: [Xen-devel] libxl: crash fails to load vmcore when the guest memory greater than 4G

["Zhangwei (FF)" <zw.zhang@xxxxxxxxxx>]

I'm not very sure, but if my vmlinux file is not correct, crash should load 
vmcore failed, whether the guest memory greater than 4G or not.

My vmlinux file was downloaded from: 
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/i386/Debuginfo/kernel-PAE-debuginfo-2.6.18-194.el5.i686.rpm

and I have send the vmlinux and vmcore files (good and bad one) download link 
to your email, you can use gunzip command to unzip these files.

In addition, my redhat5.5(32bit) guest os information:
[root@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-194.el5PAE #1 SMP Tue Mar 16 22:00:21 EDT 
2010 i686 i686 i386 GNU/Linux [root@localhost ~]#


---------------------------------------------------------------------
Sender: Daniel Kiper [mailto:dkiper@xxxxxxxxxxxx] 
Send Time: 2014年6月7日 5:22
To: Zhangwei (FF)
CC: Daniel Kiper; vincent.hanquez@xxxxxxxxxxxxx; 
stefano.stabellini@xxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxx; Chenguoping; 
Xuzhichuang
Topic: Re: [Xen-devel] libxl: crash fails to load vmcore when the guest memory 
greater than 4G

On Fri, Jun 06, 2014 at 02:00:40AM +0000, Zhangwei (FF) wrote:
> Hi, Daniel
> Thanks for replying.
> The latest crash tool has the same problem. Following are the results.
>
> When the guest memory greater than 4G(such as 8G), crash load vmcore failed.
>
> [root@localhost sdb]# crash vmlinux redhat_5.5_32_hvm_8G.core crash 7.0.6 
> Copyright (C) 2002-2014  Red Hat, Inc.
> Copyright (C) 2004, 2005, 2006, 2010  IBM Corporation Copyright (C) 1999-2006 
>  Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012  Fujitsu Limited 
> Copyright (C) 2006, 2007  VA Linux Systems Japan K.K.
> Copyright (C) 2005, 2011  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 (GDB) 7.6
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later 
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i686-pc-linux-gnu"...
> crash: read error: kernel virtual address: c0787540  type: "possible"
> WARNING: cannot read cpu_possible_map
> crash: read error: kernel virtual address: c06fffe0  type: "online"
> WARNING: cannot read cpu_online_map
> crash: read error: kernel virtual address: c068a340  type: "system_utsname"
> crash: vmlinux and redhat_5.5_32_hvm_8G.core do not match!
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Are you sure that you use correct vmlinux file for this vmcore file?
If yes, could you put both vmcore files (good and bad one) and vmlinux file 
somwhere for download? I will try to look at this issue in week or two.

Daniel
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