[Pkg-libvirt-maintainers] Bug#803264: Bug#803264: libvirt-daemon: macvtap interface for a VM won't get up

[Guido Günther]

tags 803264 +moreinfo
thanks

Hi,
On Wed, Oct 28, 2015 at 02:35:04PM +0100, Thomas SILVESTRE wrote:
> Package: libvirt-daemon
> Version: 1.2.9-9+deb8u1
> Severity: normal
> 
> Dear Maintainer,
> 
> I'm using libvirt to virtualize a VM on my laptop, this vm has to be bridged on
> the network and I'm using macvtap technology (trough virt-manager)
> 
> here is the xml part of the domain regarding network:
> <interface type='direct'>
>       <mac address='52:54:00:7f:de:65'/>
>       <source dev='eth0' mode='bridge'/>
>       <target dev='macvtap0'/>
>       <model type='virtio'/>
>       <alias name='net0'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
>     </interface>
>     <interface type='network'>
>       <mac address='52:54:00:49:cb:48'/>
>       <source network='priv'/>
>       <target dev='vnet0'/>
>       <model type='virtio'/>
>       <alias name='net1'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x07'
> function='0x0'/>
>     </interface>
> 
> When the laptop boot and I start the VM, there's no problem.
> But when I put the laptop to sleep, the macvtap interface will never get up
> again.
> 
> I even tried to stop the vm, libvirt, unload modules (macvtap, vhost_net,
> vhost, e1000e), but nothing help.
> 
> The only way to get it back working is to reboot the host os (like Windows,
> booohooo :-( )
> 
> *** Reporter, please consider answering these questions, where appropriate ***
> 
>    * What led up to the situation?
> 
> I'm not sure, either unplug/plug the ethernet connection (like removing the
> laptop from its docking station), or put laptop on sleep and wake him.
> 
> 
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
> 
> Appart a reboot, nothing effective.
> 
>    * What was the outcome of this action?
>    * What outcome did you expect instead?
> 
> When the system is wokring, the macvtap interface is "UP", but when the problem
> occurs the interface is "DOWN". Of course a "ip link set macvtap0 up" or delete
> interface and recreate them did not help.
> 
> The only thing I founded in the log is this message:
> IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready

It is unlikely that this is a libvirt issue. I'd try to reproduce
without libvirt (qemu/kvm only). Please see if this happens then either.
If this still happens we can reassign to the proper component.

Also please attach your vm/network coniguration xml.
CHeers,
 -- Guido