Bug 1267435
| Summary: | Crash tool arbitrarily rejects virsh dump files. | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Dan Zheng <dzheng> |
| Component: | libvirt | Assignee: | Libvirt Maintainers <libvirt-maint> |
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Jing Qi <jinqi> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 7.2 | CC: | dyuan, dzheng, ggopinat, gsun, huding, jdenemar, jen, juzhang, knoel, mzhan, pagupta, rbalakri, thuth, virt-maint, xfu, xuzhang, yafu |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2017-02-06 08:22:58 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Related: BZ 1304222 BZ 1373088 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 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.
|
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.