RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1238589 - iothreadinfo cannot be used
Summary: iothreadinfo cannot be used
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Peter Krempa
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-07-02 08:39 UTC by Luyao Huang
Modified: 2015-11-19 06:47 UTC (History)
5 users (show)

Fixed In Version: libvirt-1.2.17-2.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-19 06:47:57 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:2202 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2015-11-19 08:17:58 UTC

Description Luyao Huang 2015-07-02 08:39:26 UTC 
Description of problem:
iothreadinfo cannot be used

Version-Release number of selected component (if applicable):
libvirt-1.2.17-1.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.prepare a running guest with iothread 
# virsh dumpxml test4
<domain type='kvm' id='8'>
  <name>test4</name>
  <uuid>b1e7936b-104b-430e-9211-d6c61b8df313</uuid>
  <memory unit='KiB'>1024000</memory>
  <currentMemory unit='KiB'>1024000</currentMemory>
  <vcpu placement='static' current='2'>4</vcpu>
  <iothreads>2</iothreads>
  <cputune>
    <emulatorpin cpuset='2'/>
    <iothreadpin iothread='1' cpuset='3'/>
  </cputune>


2. use iothreadinfo

# virsh iothreadinfo test4
error: Unable to get domain IOThreads information
error: Unable to encode message payload

3.

Actual results:
iothreadinfo cannot be used in new version

Expected results:
can get output

Additional info:

V1 of this issue's patch:
https://www.redhat.com/archives/libvir-list/2015-June/msg01523.html
Comment 1 Peter Krempa 2015-07-02 14:55:43 UTC 
Improved patchset:

http://www.redhat.com/archives/libvir-list/2015-July/msg00138.html
Comment 2 Peter Krempa 2015-07-08 09:07:37 UTC 
Fixed upstream:

commit e8c5f61e91025f244bb022b1774a3fc6484625f8
Author: Peter Krempa <pkrempa>
Date:   Thu Jul 2 16:46:46 2015 +0200

    util: bitmap: Don't alloc overly large binary bitmaps
    
    Optimize the virBitmap to array-of-char bitmap conversion by skipping
    trailing zero bytes.
    
    This also fixes a regression when requesting iothread information from a
    live VM since after commit 825df8c3158cfaf5f398418471f10f4ff3c3515a the
    bitmap returned from virProcessGetAffinity is too big to be formatted
    properly via RPC. A user would get the following error:
    
    error: Unable to get domain IOThreads information
    error: Unable to encode message payload
Comment 5 Han Han 2015-09-11 07:08:46 UTC 
Hi Peter, I can reproduce it on libvirt-1.2.17-1.el7.x86_64
Verify it on libvirt-1.2.17-8.el7.x86_64

Step1:
Define a domain fllowing in xml:
...
 <vcpu placement='static' current='2'>4</vcpu>
  <iothreads>2</iothreads>
  <cputune>
    <emulatorpin cpuset='2'/>
    <iothreadpin iothread='1' cpuset='3'/>
  </cputune>
...


Step2:
When domain shutoff, run iothreadinfo:
# virsh iothreadinfo t38
 IOThread ID     CPU Affinity   
---------------------------------------------------
 1               3
 2               0-7


Step3:
Start domain and run iothreadinfo with --live:

# virsh start t38
Domain t38 started

# virsh iothreadinfo t38 --live
 IOThread ID     CPU Affinity   
---------------------------------------------------
 1               3
 2               0-7
Comment 7 errata-xmlrpc 2015-11-19 06:47:57 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/RHBA-2015-2202.html
Note You need to log in before you can comment on or make changes to this bug.