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== Comment: #0 - Ping Tian Han - 2016-03-31 02:19:27 ==
---Problem Description---
With the kexec-tools comes from https://bugzilla.linux.ibm.com/show_bug.cgi?id=136588#c58 , we have dumpped a vmcore for bug 139815 after quiting from xmon. But when trying to analyse with crash:

% sudo crash /usr/lib/debug/boot/vmlinux-4.4.0-15-generic
/var/crash/201603310043/dump.201603310043

crash 7.1.4
Copyright (C) 2002-2015  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 "powerpc64le-unknown-linux-gnu"...

please wait... (gathering module symbol data)
crash: invalid structure member offset: module_num_symtab
       FILE: kernel.c  LINE: 3450  FUNCTION: module_init()

[/usr/bin/crash] error trace: 1008af0c => 10124250 => 10179bd0 =>
10083378

  10083378: (undetermined)
  10179bd0: OFFSET_verify+80
  10124250: module_init+1104
  1008af0c: main_loop+764

%

== Comment: #4 - Hari Krishna Bathini - 2016-03-31 08:20:39 ==
(In reply to comment #2)
> Hi, 
> 
> Crash failing with 4.4+ kernels is a known issue which is fixed by the
> upstream patch 
> 
> commit 6f1f78e33474d00d5f261d7ed9d835c558b34d61
> Author: Dave Anderson <anderson@xxxxxxxxxx>
> Date:   Wed Jan 20 09:56:36 2016 -0500
> 
>     Fix for the changes made to the kernel module structure introduced by
>     this kernel commit for Linux 4.5 and later kernels:
>     
>       commit 7523e4dc5057e157212b4741abd6256e03404cf1
>       module: use a structure to encapsulate layout.
>     
>     Without the patch, the crash session fails during initialization
>     with the error message: "crash: invalid structure member offset:
>     module_init_text_size".
>     (sebott@xxxxxxxxxxxxxxxxxx)
> 

We also need the below upstream patch along with the patch mentioned
above to fix this issue

commit 098cdab16dfa6a85e9dad2cad604dee14ee15f66
Author: Dave Anderson <anderson@xxxxxxxxxx>
Date:   Fri Feb 12 14:32:53 2016 -0500

    Fix for the changes made to the kernel module structure introduced by
    this kernel commit for Linux 4.5 and later kernels:
    
      commit 8244062ef1e54502ef55f54cced659913f244c3e
      modules: fix longstanding /proc/kallsyms vs module insertion race.
    
    Without the patch, the crash session fails during initialization
    with the error message: "crash: invalid structure member offset:
    module_num_symtab".
    (anderson@xxxxxxxxxx)

Thanks
Hari

== Comment: #9 - Hendrik Brueckner - 2016-03-31 11:47:13 ==
Problem also exists on s390x:

** Affects: crash (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-all bugnameltc-139847 severity-high targetmilestone-inin1604
-- 
ISST-LTE:pVM:thymelp2:ubuntu 16.04: cannot analyse vmcore with crash (s390x, ppc64)
https://bugs.launchpad.net/bugs/1564487
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