Bug 1464838

Summary:	qemu records an undocumented field "=keyvalue-pairs" in overlay image of a RBD volume after snapshot
Product:	Red Hat Enterprise Linux 7	Reporter:	Han Han <hhan>
Component:	qemu-kvm-rhev	Assignee:	Virtualization Maintenance <virt-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.4	CC:	coli, dyuan, pkrempa, rbalakri, virt-maint, xuzhang, yanqzhan
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-06-26 06:48:21 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:

Description Han Han 2017-06-26 02:56:40 UTC

Description of problem:
As subject

Version-Release number of selected component (if applicable):
libvirt-3.2.0-15.el7a.x86_64
qemu-kvm-rhev-2.9.0-14.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
According to the last sentence in https://bugzilla.redhat.com/show_bug.cgi?id=1461638#c16, I file this bug.
1. Run a VM with rbd backend
2. Create external snapshot for the rbd disk
3. Do blockcommit. You will find <host/> missing in VM's xml.

Actual results:
As step3

Expected results:
<host/> is not missing

Additional info:

Comment 2 Han Han 2017-06-26 03:02:49 UTC

Hi Peter,
Since time is tight to fix it in 7.4, we should add this as known issue of release note and offer https://bugzilla.redhat.com/show_bug.cgi?id=1461638#c17 as workaround. What do you think?

Comment 3 Peter Krempa 2017-06-26 06:33:16 UTC

It might be a good idea to do this. This is a bug in qemu though so I'll move it.

Comment 4 Peter Krempa 2017-06-26 06:36:11 UTC

The string recorded in the overlay image by qemu after a snapshot is:

json:{"driver": "raw", "file": {"pool": "rbd", "image": "V", "driver": "rbd", "=keyvalue-pairs": "[\"auth_supported\", \"none\", \"mon_host\", \"10.73.75.52\"]"}}

As seen, this does not contain the 'server' section, but contains an undocumented "=keyvalue-pairs".

Comment 5 Han Han 2017-06-26 06:48:21 UTC

Since the bug moved to qemu, duplicated with BZ1464837

*** This bug has been marked as a duplicate of bug 1464837 ***