Bug 832071

Summary:	Rgmanager and libvirt updates race condition
Product:	Red Hat Enterprise Linux 6	Reporter:	CAPELLE Benoit <capelle>
Component:	rgmanager	Assignee:	Ryan McCabe <rmccabe>
Status:	CLOSED WONTFIX	QA Contact:	Cluster QE <mspqa-list>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.2	CC:	cluster-maint
Target Milestone:	rc	Keywords:	Documentation
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-08-17 18:35:59 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 CAPELLE Benoit 2012-06-14 12:50:53 UTC

Description of problem:
Libvirt was updated yesterday to version 0.9.4-23.el6_2.9. While
updating libvirt, virsh command is unavailable to rgmanager leading one node to stop two guests services:

/var/log/messages
--
Jun 13 15:01:12 kvm2 rgmanager[20461]: [vm] Cannot find 'virsh'; is it installed?
Jun 13 15:01:12 kvm2 rgmanager[6804]: status on vm "kvm2_cups_x86_64_RHEL5" returned 2 (invalid argument(s))
Jun 13 15:01:12 kvm2 rgmanager[20473]: [vm] Could not determine Hypervisor
Jun 13 15:01:12 kvm2 rgmanager[6804]: status on vm "kvm2_sam_x86_64_RHEL5" returned 2 (invalid argument(s))
Jun 13 15:01:12 kvm2 rgmanager[6804]: Stopping service vm:kvm2_cups_x86_64_RHEL5
Jun 13 15:01:12 kvm2 rgmanager[6804]: Stopping service vm:kvm2_sam_x86_64_RHEL5
Jun 13 15:01:14 kvm2 yum[19482]: Updated: libvirt-client-0.9.4-23.el6_2.9.x86_64
Jun 13 15:01:14 kvm2 yum[19482]: Updated: libvirt-python-0.9.4-23.el6_2.9.x86_64
Jun 13 15:01:20 kvm2 yum[19482]: Updated: libvirt-0.9.4-23.el6_2.9.x86_64
--


Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux Server release 6.2 (Santiago)
Kernel 2.6.32-220.17.1.el6.x86_64
rgmanager-3.0.12.1-5.el6.x86_64
libvirt-0.9.4-23.el6_2.9.x86_64

How reproducible:
While libvirt updates are installed with yum update. Behavior
observed on only one node, the other node was not affected by
updating libvirt. Maybe a rare race condition.

Steps to Reproduce:
1. yum update
2.
3.
  
Actual results:
Guests may crash and rgmanager stops vm service

Expected results:
Guests should'nt be affected by updating libvirt

Additional info:

Comment 2 Lon Hohberger 2012-07-27 18:50:47 UTC

The update of libvirt would have to occur at the same time as a status check; so this should not be common.

This can be worked around by interacting with rgmanager in a couple of ways, the most obvious is to 'freeze' all services on a host, upgrade libvirt, then unfreeze all services.

Comment 3 RHEL Program Management 2012-08-17 18:35:59 UTC

Development Management has reviewed and declined this request.
You may appeal this decision by reopening this request.