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Bug 1619866

Summary:	IO-Threads is enabled inadvertently by editing unrelated configuration
Product:	Red Hat Enterprise Virtualization Manager	Reporter:	Germano Veit Michel <gveitmic>
Component:	ovirt-engine	Assignee:	Arik <ahadas>
Status:	CLOSED ERRATA	QA Contact:	Liran Rotenberg <lrotenbe>
Severity:	urgent	Docs Contact:
Priority:	high
Version:	4.2.5	CC:	ahadas, bcholler, gveitmic, lsurette, mavital, michal.skrivanek, mtessun, Rhev-m-bugs, sborella, srevivo, tburke
Target Milestone:	ovirt-4.3.0	Keywords:	ZStream
Target Release:	4.3.0	Flags:	ahadas: needinfo-
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	ovirt-engine-4.3.0_alpha	Doc Type:	Bug Fix
Doc Text:	This release ensures that if a request occurs to disable I/O threads of a running VM, the I/O threads setting remains disabled when changing unrelated properties of a running VM.	Story Points:	---
Clone Of:
Clones:	1622994 (view as bug list)		Environment:
Last Closed:	2019-05-08 12:38:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Virt	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1622994

Description Germano Veit Michel 2018-08-22 00:31:33 UTC

Description of problem:

We have a report of a customer that does not wish to use IO-Threads and after upgrade to 4.2.5 all VMs are getting randomly IO-Threads enabled.

To reproduce:
1. Create VM with IO Threads Disabled
2. Power up the VM
3. Edit the VM, i.e. disable Memory Baloon*
4. Click OK
RESULT: IO Threads is enabled for the next-run

* Any config that triggers next-run config seems to do it. Only seem to happen if the VM is up.

Version-Release number of selected component (if applicable):
ovirt-engine-4.2.5.3-1.el7.noarch

How reproducible:
100%

Steps to Reproduce:
As above

Actual results:
IO Threads Enabled

Expected results:
IO Threads Disabled

Comment 4 Michal Skrivanek 2018-08-22 06:36:20 UTC

it should be the same root cause (and same fix eventually) as bug 1619474
But I would prefer to keep this bug opened to independently verify both flows

Comment 5 Liran Rotenberg 2018-08-26 12:16:15 UTC

Verified on:
ovirt-engine-4.2.6.4-0.0.master.20180823141941.gitb3a5b18.el7.noarch

Steps of verification:
1. Create a new VM with IO-Threads disabled.
2. Start the VM.
3. Change a VM property - for example disabled ballooning (confirm that the change require VM restart).
4. Check the VM configuration for next-run (IO-Threads should be disabled).
4. Restart the VM.
5. Check the VM IO-Threads.

Results:
The VM IO-Threads was disabled all along and didn't change when editing other VM property.

Comment 9 errata-xmlrpc 2019-05-08 12:38:08 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:1085