Interface vif(d).2> goes down directly after starting up

Interface vif(d).2> goes down directly after starting up

[Rickard Borgmäster]

Hello,

I'm trying to get 6 interfaces to work inside the domU's of a
xen-unstable host. Using something like:
xm create -c crab-domU.cfg name=test vif=bridge=xenbr0 vif=bridge=xenbr1
vif=bridge=xenbr2 vif=bridge=xenbr3 vif=bridge=xenbr4 vif=bridge=xenbr5

When the domU is booted, only eth0 eth1 and eth2 is visible. On the
dom0, same thing (vif(d).0 vif(d).1 and vif(d).2). Examining the logs
gave me this interesting output: (sorted for readability)

vif-bridge: online XENBUS_PATH=backend/vif/9/0
vif-bridge: Successful vif-bridge online for vif9.0, bridge xenbr0.
vif-bridge: Writing backend/vif/9/0/hotplug-status connected to xenstore.

vif-bridge: online XENBUS_PATH=backend/vif/9/1
vif-bridge: Successful vif-bridge online for vif9.1, bridge xenbr1.
vif-bridge: Writing backend/vif/9/1/hotplug-status connected to xenstore.

vif-bridge: online XENBUS_PATH=backend/vif/9/2
vif-bridge: Successful vif-bridge online for vif9.2, bridge xenbr2.
vif-bridge: Writing backend/vif/9/2/hotplug-status connected to xenstore.

vif-bridge: online XENBUS_PATH=backend/vif/9/3
vif-bridge: Successful vif-bridge online for vif9.3, bridge xenbr3.
vif-bridge: Writing backend/vif/9/3/hotplug-status connected to xenstore.
vif-bridge: offline XENBUS_PATH=backend/vif/9/3
vif-bridge: brctl delif xenbr0 vif9.3 failed
vif-bridge: ifconfig vif9.3 down failed
vif-bridge: Successful vif-bridge offline for vif9.3, bridge xenbr0.

vif-bridge: online XENBUS_PATH=backend/vif/9/4
vif-bridge: Successful vif-bridge online for vif9.4, bridge xenbr4.
vif-bridge: Writing backend/vif/9/4/hotplug-status connected to xenstore.
vif-bridge: offline XENBUS_PATH=backend/vif/9/4
vif-bridge: brctl delif xenbr0 vif9.4 failed
vif-bridge: ifconfig vif9.4 down failed
vif-bridge: Successful vif-bridge offline for vif9.4, bridge xenbr0.

vif-bridge: online XENBUS_PATH=backend/vif/9/5
vif-bridge: Successful vif-bridge online for vif9.5, bridge xenbr5.
vif-bridge: Writing backend/vif/9/5/hotplug-status connected to xenstore.
vif-bridge: offline XENBUS_PATH=backend/vif/9/5
vif-bridge: brctl delif xenbr0 vif9.5 failed
vif-bridge: ifconfig vif9.5 down failed
vif-bridge: Successful vif-bridge offline for vif9.5, bridge xenbr0.

As you can see, the interface 3, 4 and 5 are brought up just like 0, 1
and 2. But for some reason, they are taken down right after that.

What's causing this? I've tried to backtrack the operations to see if
there is something calling vif-bridge offline but I didn't find any.

Is this a bug or am I doing something wrong? Please give me a hint on
how to troubleshoot this.

Best regards
Rickard Borgmäster