https://www.redhat.com/archives/libvir-list/2013-July/msg00668.html

https://bugzilla.novell.com/show_bug.cgi?id=829033

https://bugs.launchpad.net/ubuntu/+source/netbase/+bug/1255516

https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/997978

[105713.011043] virbr0: port 4(vethP2MDTT) entered blocking state
[105713.011046] virbr0: port 4(vethP2MDTT) entered listening state
[105715.012039] virbr0: port 4(vethP2MDTT) entered learning state
[105717.016038] virbr0: port 4(vethP2MDTT) entered forwarding state
[105717.016046] virbr0: topology change detected, propagating
[106368.510499] device virbr0 left promiscuous mode
[106472.090144] virbr0: port 4(vethP2MDTT) entered disabled state
[106472.092441] device vethP2MDTT left promiscuous mode
[106472.092449] virbr0: port 4(vethP2MDTT) entered disabled state