[libvirt] Instances

I'm running libvirt with qemu-kvm underneath. My network stack has the eth0 interface which is bridged to a br0 interface. Usually, when a VM starts up, a new "vnet" interface is created as well by libvirt. That vnet interface has a matching HWaddr to the VM that was spun up with it, so I'm assuming they're associated somehow. Sometimes, after using libvirt's "virt-install" to create a VM, I'm unable to "virsh start" it. Virsh will print this out to stderr that it couldn't start that VM, since the connection was "Reset by peer". I've yet to find a repro case for this issue. Eventually, I am able to "virsh start" the instance, but only after several minutes. Are there any known issues with libvirt/qemu-kvm failing to instantiate network devices when it spins up VMs? This is printed to the logs as well: Mar 27 16:21:07 localhost kernel: device vnet42 entered promiscuous mode Mar 27 16:21:07 localhost kernel: br0: port 44(vnet42) entering forwarding state Mar 27 16:21:07 localhost logger: KVM: 43 guests now active Mar 27 16:21:08 localhost kernel: br0: port 44(vnet42) entering disabled state Mar 27 16:21:08 localhost kernel: device vnet42 left promiscuous mode Mar 27 16:21:08 localhost kernel: br0: port 44(vnet42) entering disabled state Mar 27 16:21:08 localhost logger: KVM: 42 guests now active