Ubuntu
crash package

  1. Artful (17.10)
  2. Bug #1746088
  3. Comment #0

Comment 0 for bug 1746088

Revision history for this message
bugproxy (bugproxy) wrote :

---Problem Description---
Unable to analyze the vmcore generated by kdump on 4.13.0-26-generic kernel (Ubuntu 16.04.4)

---uname output---
Linux ltc-briggs1 4.13.0-26-generic #29~16.04.2-Ubuntu SMP Tue Jan 9 21:40:36 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux

Machine Type = 8001-22C

---Steps to Reproduce---
 This bug follow up bug of https://bugzilla.linux.ibm.com/show_bug.cgi?id=163565
The steps to create dump is as follows

Once you generate the kdump
use crash to analyze the vmcore and we get this error

================console logs ==========

root@ltc-briggs1:/var/crash/201801150227# ls
dmesg.201801150227 vmcore.201801150227
.0-26-generic vmcore.2018011502271150227# crash /usr/lib/debug/boot/vmlinux-4.13.

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)
WARNING: cannot access vmalloc'd module memory

crash: invalid structure member offset: thread_info_task
       FILE: task.c LINE: 598 FUNCTION: irqstacks_init()

[/usr/bin/crash] error trace: 1008ade0 => 1011552c => 1017d220 => 100833e0

  100833e0: (undetermined)
  1017d220: OFFSET_verify+80
  1011552c: task_init+5084
  1008ade0: main_loop+336

== Comment from Hari Krishna Bathini ==

There are quite a few commits (all available upstream) that are needed for
crash tool to work fine. I think the right thing to do here would be to use
the latest crash tool version 7.2.0 to go with the kernel update. Also, the
below commit would be needed on top of 7.2.0 crash utility:

  commit c8178eca9c74f81a7f803a58d339635cc152e8d9
  Author: Dave Anderson <email address hidden>
  Date: Thu Nov 9 11:39:05 2017 -0500

    Update for support of Linux 4.14 and later PPC64 kernels where the
    hash page table geometry accomodates a larger virtual address range.
    Without the patch, the virtual-to-physical translation of user space
    virtual addresses by "vm -p", "vtop", and "rd -u" may generate an
    invalid translation or otherwise fail.
    (<email address hidden>)

Similar thing holds true for makedumpfile tool..

Thanks
Hari