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Bug 1182486

Summary: libvirtd crashed when updating a IPv6 <host> and a IPv4 <host> into a IPv4 <ip> element
Product: Red Hat Enterprise Linux 7 Reporter: Hu Jianwei <jiahu>
Component: libvirtAssignee: Michal Privoznik <mprivozn>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: high    
Version: 7.1CC: dyuan, honzhang, lmiksik, mzhan, rbalakri
Target Milestone: rcKeywords: Upstream
Target Release: ---   
Hardware: x86_64   
OS: All   
Whiteboard:
Fixed In Version: libvirt-1.2.8-14.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-03-05 07:49:12 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:
Attachments:
Description Flags
All back trace for the bug none

Description Hu Jianwei 2015-01-15 09:22:00 UTC 
Description of problem:
libvirtd crashed when updating a IPv6 <host> and a IPv4 <host> into a IPv4 <ip> element

Version-Release number of selected component (if applicable):
libvirt-1.2.8-12.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
[root@localhost ~]# virsh net-list 
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes

[root@localhost ~]# cat libvirt-test-API/repos/network/xmls/ip-dhcp-host.xml
<host mac="00:16:3e:77:e2:ed" name="foo.example.com" ip="192.168.122.10" />

[root@localhost ~]# cat libvirt-test-API/repos/network/xmls/ipv6-dhcp-host.xml
<host id='00:04:58:fd:e4:15:1b:09:4c:0e:09:af:e4:d3:8c:b8:ca:1e' name="redhatipv6.redhat.com" ip='2001:db8:ca2:2::119'/>

[root@localhost ~]# virsh net-dumpxml default
<network>
  <name>default</name>
  <uuid>ac3350be-5fa1-405c-b19f-cf0ef7c81263</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:15:e9:3a'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
  <ip family='ipv6' address='2001:db8:ca2:2::1' prefix='64'>
    <dhcp>
      <range start='2001:db8:ca2:2::100' end='2001:db8:ca2:2::1ff'/>
    </dhcp>
  </ip>
</network>

[root@localhost ~]# virsh net-update default add-first ip-dhcp-host libvirt-test-API/repos/network/xmls/ipv6-dhcp-host.xml --parent-index 0
Updated network default live state

[root@localhost ~]# virsh net-update default add-first ip-dhcp-host libvirt-test-API/repos/network/xmls/ip-dhcp-host.xml --parent-index 0
error: Failed to update network default
error: internal error: received hangup / error event on socket
error: Failed to reconnect to the hypervisor

Actual results:
As shown above steps.

Expected results:
Should prevent such behavior.

Additional info:
1. [root@jiahu libvirt-test-API]# virsh net-update default add-first ip-dhcp-host modify-ip-dhcp-host.xml --parent-index 1
error: Failed to update network default
error: XML error: Invalid to specify MAC address '00:16:3e:77:e2:ed' in network 'default' IPv6 static host definition
Comment 1 Hu Jianwei 2015-01-15 09:22:58 UTC 
Created attachment 980379 [details]
All back trace for the bug
Comment 5 Michal Privoznik 2015-01-15 14:48:48 UTC 
Patch proposed upstream:

https://www.redhat.com/archives/libvir-list/2015-January/msg00546.html
Comment 6 Michal Privoznik 2015-01-16 09:01:42 UTC 
I've just pushed the patch upstream:

commit 7d3ae359db604f6052247ad49d7fbce1db7ef99c
Author:     Michal Privoznik <mprivozn>
AuthorDate: Thu Jan 15 15:42:04 2015 +0100
Commit:     Michal Privoznik <mprivozn>
CommitDate: Fri Jan 16 09:57:05 2015 +0100

    virNetworkDefUpdateIPDHCPHost: Don't crash when updating network
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1182486
    
    When updating a network and adding new ip-dhcp-host entry, the deamon
    may crash. The problem is, we iterate over existing <host/> entries
    trying to compare MAC addresses to see if there's already an existing
    rule. However, not all entries are required to have MAC address. For
    instance, the following is perfectly valid entry:
    
    <host id='00:04:58:fd:e4:15:1b:09:4c:0e:09:af:e4:d3:8c:b8:ca:1e'
    name='redhatipv6.redhat.com' ip='2001:db8:ca2:2::119'/>
    
    When the checking loop iterates over this, the entry's MAC address is
    accessed directly. Well, the fix is obvious - check if the address is
    defined before trying to compare it.
    
    Signed-off-by: Michal Privoznik <mprivozn>


v1.2.11-177-g7d3ae35
Comment 7 Michal Privoznik 2015-01-16 09:04:06 UTC 
And moving to POST:

http://post-office.corp.redhat.com/archives/rhvirt-patches/2015-January/msg00360.html
Comment 9 Hu Jianwei 2015-01-22 07:43:13 UTC 
I can not reproduce it on below version.

[root@ibm-x3850x5-06 ~]# rpm -q libvirt 
libvirt-1.2.8-15.el7.x86_64

[root@ibm-x3850x5-06 ~]# cat ip-dhcp-host.xml 
<host mac='52:54:00:cb:17:00' name='jiahu.example.com' ip='192.168.122.10'/>
[root@ibm-x3850x5-06 ~]# cat ipv6-dhcp-host.xml
<host id='00:04:58:fd:e4:15:1b:09:4c:0e:09:af:e4:d3:8c:b8:ca:1e' name="redhatipv6.redhat.com" ip='2001:db8:ca2:2::119'/>

[root@ibm-x3850x5-06 ~]# cat 123.sh 
service libvirtd status
virsh net-update default add-first ip-dhcp-host ipv6-dhcp-host.xml --parent-index 0
virsh net-update default add-first ip-dhcp-host ip-dhcp-host.xml --parent-index 0
virsh net-dumpxml default
virsh net-update default delete ip-dhcp-host ip-dhcp-host.xml --parent-index 0
virsh net-update default delete ip-dhcp-host ipv6-dhcp-host.xml --parent-index 0
virsh net-dumpxml default
service libvirtd status

[root@ibm-x3850x5-06 ~]# sh 123.sh 
Redirecting to /bin/systemctl status  libvirtd.service
libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; disabled)
   Active: active (running) since Thu 2015-01-22 14:29:32 CST; 54min ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 12683 (libvirtd)
   CGroup: /system.slice/libvirtd.service
           ├─12224 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12225 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12329 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/test1.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12330 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/test1.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           └─12683 /usr/sbin/libvirtd

Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:22:43 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Updated network default live state
Updated network default live state
<network>
  <name>default</name>
  <uuid>6d4f9a7b-d8bc-4150-a891-46019e4c99a5</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:42:e5:99'/>
  <domain name='example.com'/>
  <dns>
    <forwarder addr='8.8.8.8'/>
    <forwarder addr='8.8.4.4'/>
    <txt name='hjw' value='redhat jiahu'/>
  </dns>
  <ip address='192.168.122.1' netmask='255.255.0.0'>
    <dhcp>
      <range start='192.168.1.2' end='192.168.5.254'/>
      <host mac='52:54:00:cb:17:00' name='jiahu.example.com' ip='192.168.122.10'/>
      <host id='00:04:58:fd:e4:15:1b:09:4c:0e:09:af:e4:d3:8c:b8:ca:1e' name='redhatipv6.redhat.com' ip='2001:db8:ca2:2::119'/>
    </dhcp>
  </ip>
  <ip family='ipv6' address='2001:db8:ca2:2::1' prefix='64'>
    <dhcp>
      <range start='2001:db8:ca2:2::100' end='2001:db8:ca2:2::1ff'/>
    </dhcp>
  </ip>
</network>

Updated network default live state
Updated network default live state
<network>
  <name>default</name>
  <uuid>6d4f9a7b-d8bc-4150-a891-46019e4c99a5</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:42:e5:99'/>
  <domain name='example.com'/>
  <dns>
    <forwarder addr='8.8.8.8'/>
    <forwarder addr='8.8.4.4'/>
    <txt name='hjw' value='redhat jiahu'/>
  </dns>
  <ip address='192.168.122.1' netmask='255.255.0.0'>
    <dhcp>
      <range start='192.168.1.2' end='192.168.5.254'/>
    </dhcp>
  </ip>
  <ip family='ipv6' address='2001:db8:ca2:2::1' prefix='64'>
    <dhcp>
      <range start='2001:db8:ca2:2::100' end='2001:db8:ca2:2::1ff'/>
    </dhcp>
  </ip>
</network>

Redirecting to /bin/systemctl status  libvirtd.service
libvirtd.service - Virtualization daemon
   Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; disabled)
   Active: active (running) since Thu 2015-01-22 14:29:32 CST; 54min ago
     Docs: man:libvirtd(8)
           http://libvirt.org
 Main PID: 12683 (libvirtd)
   CGroup: /system.slice/libvirtd.service
           ├─12224 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12225 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/default.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12329 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/test1.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           ├─12330 /sbin/dnsmasq --conf-file=/var/lib/libvirt/dnsmasq/test1.conf --dhcp-script=/usr/libexec/libvirt_leaseshelper
           └─12683 /usr/sbin/libvirtd

Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /etc/hosts - 2 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq[12224]: read /var/lib/libvirt/dnsmasq/default.addnhosts - 0 addresses
Jan 22 15:24:26 ibm-x3850x5-06.qe.lab.eng.nay.redhat.com dnsmasq-dhcp[12224]: read /var/lib/libvirt/dnsmasq/default.hostsfile
[root@ibm-x3850x5-06 ~]# 

Can not hit the libvirtd crash, regarding the ipv6 <host> in wrong <ip> section, I filed a new bug to track it.
Bug 1184736 - libvirt should verify proper address family of <host> when updating network
Comment 11 errata-xmlrpc 2015-03-05 07:49:12 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