Bug 1147494

Summary:	libvirtd crashes when starting a domain with 0 cpu shares
Product:	Red Hat Enterprise Linux 7	Reporter:	Ján Tomko <jtomko>
Component:	libvirt	Assignee:	Ján Tomko <jtomko>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.1	CC:	dyuan, honzhang, jdenemar, jmiao, lmiksik, mzhan, rbalakri
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	libvirt-1.2.8-5.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 07:45:54 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 Ján Tomko 2014-09-29 11:53:52 UTC

Description of problem:
libvirtd crashes when starting a domain with 0 cpu shares

Version-Release number of selected component (if applicable):
libvirt-1.2.8-4.el7

How reproducible:
100 %

Steps to Reproduce:
1. Start a domain with <cputune><shares>0</shares></cputune>

Actual results:
Crash.

Expected results:
No crash.

Comment 1 Ján Tomko 2014-09-29 11:55:46 UTC

Upstream patch:
https://www.redhat.com/archives/libvir-list/2014-September/msg01676.html

Comment 2 Ján Tomko 2014-09-29 12:02:17 UTC

Fixed upstream:
commit e26bbf49cc051b5d5c2a86c572f55953e617e872
Author:     Ján Tomko <jtomko>
CommitDate: 2014-09-29 13:58:43 +0200

    Fix crash cpu_shares change event crash on domain startup
    
    Introduced by commit 0dce260.
    
    qemuDomainEventQueue was called with qemuDomainObjPrivatePtr instead
    of virQEMUDriverPtr.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1147494

git describe: v1.2.9-rc1-21-ge26bbf4

Comment 5 Jincheng Miao 2014-10-15 10:12:17 UTC

This bug could be reproduced in libvirt-1.2.8-4.el7:
# rpm -q libvirt
libvirt-1.2.8-4.el7.x86_64

# virsh edit r6
...
  <cputune>
    <shares>0</shares>
  </cputune>
...

# virsh start r6
error: Failed to start domain r6
error: End of file while reading data: Input/output error
error: Failed to reconnect to the hypervisor


But in latest libvirt-1.2.8-5.el7, it works:
# rpm -q libvirt
libvirt-1.2.8-5.el7.x86_64

# virsh edit r6
...
  <cputune>
    <shares>0</shares>
  </cputune>
...

# virsh start r6
Domain r6 started

So change the status to VERIFIED.

Comment 7 errata-xmlrpc 2015-03-05 07:45:54 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://rhn.redhat.com/errata/RHSA-2015-0323.html