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Bug 591438 - libvirt: daemon restart forgets <interface> targets, breaks 'virsh domifstat'
libvirt: daemon restart forgets <interface> targets, breaks 'virsh domifstat'
Product: Fedora
Classification: Fedora
Component: libvirt (Show other bugs)
All Linux
low Severity medium
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Assigned To: Daniel Veillard
Fedora Extras Quality Assurance
Depends On:
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Reported: 2010-05-12 05:14 EDT by M Nikolov
Modified: 2010-07-26 22:48 EDT (History)
7 users (show)

See Also:
Fixed In Version: libvirt-0.8.2-1.fc12
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2010-07-26 22:48:58 EDT
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Regression: ---
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description M Nikolov 2010-05-12 05:14:50 EDT
Description of problem:
If I have QEMU/KVM guest started in libvirtd and then restart libvirtd, libvirtd no longer knows mapping between guests and tun devices on host and quering virDomainInterfaceStats do not work.

Version-Release number of selected component (if applicable):
libvirt version 0.7.1 (Fedora 12 rpm: libvirt-0.7.1-15.fc12.x86_64)

also tested with Centos 5.4 and libvirt 0.6.3

How reproducible:
every time

Steps to Reproduce:
1. Start QEMU/KVM guest with: virsh start vm01
2. restart libvirtd: /sbin/service libvrtd restart
3. Get statistics with virsh domifstat vm01 vnet0
Actual results:
[root@kvm01 ~]# virsh domifstat vm01 vnet0
error: Failed to get interface stats vm01 vnet0
error: invalid argument in invalid path, 'vnet0' is not a known interface

Expected results:
[root@kvm01 ~]# virsh domifstat vm01 vnet0
vnet0 rx_bytes 83980
vnet0 rx_packets 1612
vnet0 rx_errs 0
vnet0 rx_drop 0
vnet0 tx_bytes 3546
vnet0 tx_packets 15
vnet0 tx_errs 0
vnet0 tx_drop 0

Additional info:
I found out that after libvirtd forgets mapping for virtual interfaces. Here are the output from virsh dumpxml vm01 before restart:
    <interface type='network'>
      <mac address='52:54:00:28:59:5c'/>
      <source network='default'/>
      <target dev='vnet0'/>
      <model type='virtio'/>

and after restart of libvirtd:
    <interface type='network'>
      <mac address='52:54:00:28:59:5c'/>
      <source network='default'/>
      <model type='virtio'/>

the <target dev='vnet0'/>  is missing.
Comment 1 Cole Robinson 2010-05-21 13:45:26 EDT
Thanks for the report, sounds like a real bug.
Comment 2 Fedora Update System 2010-07-12 13:16:31 EDT
libvirt-0.8.2-1.fc13 has been submitted as an update for Fedora 13.
Comment 3 Fedora Update System 2010-07-12 13:22:20 EDT
libvirt-0.8.2-1.fc12 has been submitted as an update for Fedora 12.
Comment 4 Fedora Update System 2010-07-13 03:43:51 EDT
libvirt-0.8.2-1.fc12 has been pushed to the Fedora 12 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update libvirt'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/libvirt-0.8.2-1.fc12
Comment 5 Cole Robinson 2010-07-13 08:40:35 EDT
Danpb, has this really been fixed? I don't remember an upstream patch addressing it.
Comment 6 Daniel Berrange 2010-07-13 08:54:56 EDT
Yep, in this patch:

commit 362bc09a4d9441f9abd14956546777f86d8b9d79
Author: Jiri Denemark <jdenemar@redhat.com>
Date:   Tue May 4 15:16:29 2010 +0200

    Don't wipe generated iface target in active domains
    Wipe generated interface target only when reading configuration of
    inactive domains.
Comment 7 Fedora Update System 2010-07-26 22:48:21 EDT
libvirt-0.8.2-1.fc12 has been pushed to the Fedora 12 stable repository.  If problems still persist, please make note of it in this bug report.

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