Comment 116 for bug 997978

So I'm sorry to report that after about 50 days of uptime on qemu-kvm (1.0+noroms-0ubuntu14.3) I had 3 VMs out of ~60 in my cluster drop off the network. It happened on different host machines, so it's not a single machine in the cluster that's a problem.

Two of the nodes were restarted (full qemu shutdown/relaunch) so I didn't have a chance to debug them.

One of them I was able to console and work on before I gave up and restarted it. The interesting things I discovered was that the workarounds I had done in the past did not work. Previously I was able to ifdown/ifup the virtual interface to restore networking. Also migrating between nodes did not restore networking.