RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1267435 - Crash tool arbitrarily rejects virsh dump files.
Summary: Crash tool arbitrarily rejects virsh dump files.
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Libvirt Maintainers
QA Contact: Jing Qi
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-09-30 03:00 UTC by Dan Zheng
Modified: 2017-02-06 08:24 UTC (History)
17 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-02-06 08:22:58 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Dan Zheng 2015-09-30 03:00:13 UTC 
Description of problem:
Crash tool arbitrarily rejects virsh dump files. This is a regression one from 
qemu-kvm-rhev-2.3.0-17.el7.ppc64le. Before that version, crash tool can accept the virsh dump file.

Version-Release number of selected component (if applicable):
kernel-3.10.0-319.el7.x86_64
libvirt-1.2.17-11.el7.x86_64
qemu-kvm-rhev-2.3.0-26.el7.x86_64
kernel-debuginfo-common-x86_64-3.10.0-319.el7.x86_64
kernel-debuginfo-3.10.0-319.el7.x86_64
crash-7.1.2-2.el7.x86_64

Guest: kernel-3.10.0-319.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Start the guest and run # virsh dump guest /tmp/001, then /tmp/001 is created.
 
2. # crash /usr/lib/debug/lib/modules/3.10.0-319.el7.x86_64/vmlinux /tmp/001

Actual results:
Crash tool rejects the virsh dump file.

crash 7.1.2-2.el7
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.
 
                                       
crash: /tmp/001: initialization failed


Expected results:
Two ways to fix when run 'virsh dump'
1. Produce an error message saying --memory-only option is required.
or 
2. Create the dump file with valid format, maybe ELF by default??

Additional info:
Refer to bug 1240497, there are different code paths for virsh dump and guest crash. And two different formats are used for the two cases. 'virsh dump' used the old qemu migration file format which seems out of date and will not developed any more. So it is suggested using 'virsh dump --memory-only' which will by default use ELF format instead of 'virsh dump'.  However, 'virsh dump' can work with qemu-kvm-rhev-2.3.0-16.el7.x86_64 and before. It is unreasonable that it fails from qemu-kvm-rhev-2.3.0-17.el7.x86_64. So two ways are suggested to fix this.
Comment 5 Jeff Nelson 2016-10-07 14:08:49 UTC 
Related:
BZ 1304222
BZ 1373088
Comment 6 Greeshma Gopinath 2017-02-03 18:25:52 UTC 
As per Lazlo Ersek's recommendations:
The following solution wouldnt work:

Two ways to fix when run 'virsh dump'
1. Produce an error message saying --memory-only option is required.
or 
2. Create the dump file with valid format, maybe ELF by default??

"because the file format that plain "virsh dump" produces (which is
basically a QEMU migration stream saved into a file) could still be
useful for various use cases."

I am reassigning the bug to the libvirt to note the new change in virsh behaviour
Comment 7 Jiri Denemark 2017-02-06 08:22:58 UTC 
This is already documented in 7.3:

commit dd14032b39c8682b822c7055db5668302686fbcf
Author:     Jaroslav Suchanek <jsuchane>
AuthorDate: Mon Jun 20 13:34:28 2016 +0200
Commit:     Martin Kletzander <mkletzan>
CommitDate: Mon Jun 20 14:37:02 2016 +0200

    docs: virsh: Added note for the dump command
    
    Crash dump in a old kvmdump format is being obsolete and cannot be loaded and
    processed by crash utility since its version 6.1.0. A --memory-only option is
    required in order to produce valid ELF file which can be later processed by the
    crash utility. A new note is added to the dump command description.
Note You need to log in before you can comment on or make changes to this bug.