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

[Don Slutz <dslutz@xxxxxxxxxxx>]

I was able to reproduce this. The issue that I found is that the file offset was
being truncated to a long (32bits...). The attached patch fixes my test case.

-Don Slutz

On 06/09/14 21:50, Zhangwei (FF) wrote:
> 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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Attachment: 0001-xendump-Use-off_t-not-long-for-32bit-code.patch
Description: Text Data

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