Red Hat Bugzilla – Full Text Bug Listing
|Summary:||virt-manager/libvirt creates Windows XP virtual machine with no explicit 'vethX' interface name leading to conflict with 'veth0' in other virtual machine|
|Product:||[Fedora] Fedora||Reporter:||Nathan Watson <nwatson>|
|Component:||libvirt||Assignee:||Daniel Veillard <veillard>|
|Status:||CLOSED WONTFIX||QA Contact:|
|Version:||7||CC:||djuran, triage, xen-maint|
|Fixed In Version:||Doc Type:||Bug Fix|
|Doc Text:||Story Points:||---|
|Last Closed:||2008-06-16 21:39:07 EDT||Type:||---|
|oVirt Team:||---||RHEL 7.3 requirements from Atomic Host:|
Description Nathan Watson 2007-06-19 03:51:41 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:126.96.36.199) Gecko/20070515 Firefox/188.8.131.52 Description of problem: I have two virtual QEMU/KVM virtual machines on a Fedora 7 x86_64 machine. Both are running "hardware-accelerated ?" (QEMU + KVM). The 'virbr0' virtual network is started by default by libvirtd et. al. (?) on machine startup. I can run both machines separately, i.e., one at a time, but cannot run both together. Whenever trying to start the second virtual machine I get a particular error which I'll describe later. One virtual machine is Fedora Core 7 running x86_64 (QEMU + KVM). The other virtual machine is Windows XP Pro SP 2 (SP 2 from install, not applied post-install), running on i686 (QEMU + KVM, I'm supposing hardware KVM works on x86_64 for i686 since the virtual machine runs fine in i686 other than this networking issue). Version-Release number of selected component (if applicable): qemu-0.9.0-2.fc7 libvirt-0.2.3-1.fc7 kvm-24-1 (libvirt-python-0.2.3-1.fc7 ??) How reproducible: Always Steps to Reproduce:  Boot machine into *.fc7 (not *.fc7xen) kernel, along with 'qemu' and 'libvirtd' daemons started at beginning  virtual network 'virbr0' started automatically, config file shown below  start either virtual machine 'BogatzaFedora7M01' or 'BogatzaWinXpProM02', both are configured to attach to 'virbr0' (this step succeeds) -- NOTE: I used virt-manager to create/install both virtual machines, and also to start/stop the virtual machines  while first virtual machine is one, try to start the other virtual machine, which also attaches to 'virbr0' virtual network (start from virt-manager) -- THIS STEP FAILS WITH ERROR SHOW IN THE "Actual Results" section Actual Results: In every case where I try to start second virtual machine I get a virt-manager error dialog box exposing an error seen at the Python level (must be virt-manager impl lang?). The dialog box has as heading: virDomainCreate() failed internal error Failed to add tap interface 'vnet0' to bridge 'virbr0': Device or resource busy ... there is a Details "button" allowing one to see more error details, the details read: Unable to start virtual machine '<class 'libvirt.libvirtError'> virDomainCreate() failed internal error Failed to add tap interface 'vnet0' to bridge 'virbr0' : Device or resource busy Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/console.py", line 348, in control_vm_run self.vm.startup() File "/usr/share/virt-manager/virtManager/domain.py", line 361, in startup self.vm.create() File "/usr/lib64/python2.5/site-packages/libvirt.py", line 217, in create if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self) libvirtError: virDomainCreate() failed internal error Failed to add tap interface 'vnet0' to bridge 'virbr0' : Device or resource busy ' There is no workaround that I can see since it's necessary and essential to attach multiple machines to the same virtual network. Expected Results: virt-manager/libvirt, etc., should start second virtual machine without complaining and without problem. (And I assume the 'veth0' is a virtual-machine-visible interface name, and that the 'veth0' apparently started by the two machines should not conflict in namespace with each other. In any case, I'll probably try to state an explicit 'veth1' for the Windows XP virtual machine definition, because (a) it's missing; and (b) it might resolve the problem by avoiding namespace/perceived-device clash.) (I might also try creating a second virtual network 'virbr1' and attaching the two machines to independent networks or to the second network and see what happens there.) Additional info: --- DIRECTORY LISTING FOR: /etc/libvirt/qemu (config dir for QEMU virt env) .: BogatzaFedora7m01.xml BogatzaWinXpProM02.xml networks ./networks: autostart default.xml ./networks/autostart: default.xml --- config for Fedora 7 virt machine, untouched/unedited, as created/maintained by virt-manager <domain type='kvm'> <name>BogatzaFedora7m01</name> <uuid>b1b4fa10-927b-fde1-c6de-eabfbbd8ecf0</uuid> <memory>1024000</memory> <currentMemory>1024000</currentMemory> <vcpu>1</vcpu> <os> <type>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='block' device='disk'> <source dev='/dev/NoRaidVolGroupB/BogatzaFedora7m01_RootFs'/> <target dev='hda'/> </disk> <interface type='network'> <mac address='00:16:3e:56:4b:5a'/> <source network='default'/> <target dev='vnet0'/> </interface> <graphics type='vnc' port='-1'/> </devices> </domain> --- config for in XP virt machine, untouched/unedited, as created/maintained by virt-manager <domain type='kvm'> <name>BogatzaWinXpProM02</name> <uuid>2414b75d-bee1-b91d-bb64-93f3f318edeb</uuid> <memory>512000</memory> <currentMemory>512000</currentMemory> <vcpu>1</vcpu> <os> <type>hvm</type> <boot dev='hd'/> </os> <features> <acpi/> </features> <on_poweroff>destroy</on_poweroff> <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> <emulator>/usr/bin/qemu-kvm</emulator> <disk type='block' device='disk'> <source dev='/dev/NoRaidVolGroupB/BogatzaWinXpProM02_RootFs'/> <target dev='hda'/> </disk> <interface type='network'> <mac address='00:16:3e:63:42:f4'/> <source network='default'/> </interface> <graphics type='vnc' port='-1'/> </devices> </domain> --- config for 'default' network 'virbr0', edited only to change the DHCP range (and the problem occurred before ever changing this DHCP range by hand and re-booting) <network> <name>default</name> <uuid>d83670ee-a32a-4d07-9939-e83071852405</uuid> <bridge name="virbr0" /> <forward/> <ip address="192.168.122.1" netmask="255.255.255.0"> <dhcp> <range start="192.168.122.100" end="192.168.122.110" /> </dhcp> </ip> </network>
Comment 1 Nathan Watson 2007-06-19 04:10:56 EDT
One more thing: whenever I run into the problem starting the second virtual machine, if I shut down the first virtual machine and then try again to start the "second" virtual machine, it succeeds.
Comment 2 Nathan Watson 2007-06-19 04:24:25 EDT
OK ... the thing where I add an explicit 'veth1' to the Windows XP thing seems to work OK ... haven't tried the networking in the Windows XP virtual machine (i.e., I'm not sure the Win XP machine will actually find the new virtual interface), but at least both machines start up. ... with some more work ... I find that both virtual machines now can start up together, and that they both can 'ping' internal and external targets, and internet browsers can reach and pull down www.yahoo.com. Based on this I'm changing the bug title from: "Running 2nd QEMU/KVM virtual machine fails when setting up virtual networking to bridge 'virbr0'" to "virt-manager/libvirt creates Windows XP virtual machine with no explicit 'vethX' interface name leading to conflict with 'veth0' in other virtual machine" -- I believe that's what happened. I suppose the 'vethX' stuff can conflict namespace-wise at the host level and must be unique across all virtual machines (?).
Comment 3 Bug Zapper 2008-05-14 09:11:23 EDT
This message is a reminder that Fedora 7 is nearing the end of life. Approximately 30 (thirty) days from now Fedora will stop maintaining and issuing updates for Fedora 7. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as WONTFIX if it remains open with a Fedora 'version' of '7'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version prior to Fedora 7's end of life. Bug Reporter: Thank you for reporting this issue and we are sorry that we may not be able to fix it before Fedora 7 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora please change the 'version' of this bug. If you are unable to change the version, please add a comment here and someone will do it for you. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete. If possible, it is recommended that you try the newest available Fedora distribution to see if your bug still exists. Please read the Release Notes for the newest Fedora distribution to make sure it will meet your needs: http://docs.fedoraproject.org/release-notes/ The process we are following is described here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
Comment 4 Bug Zapper 2008-06-16 21:39:05 EDT
Fedora 7 changed to end-of-life (EOL) status on June 13, 2008. Fedora 7 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.