FYI, I just rebooted all the H* and ubuntu-* slaves to get an upgraded kernel to deal with https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1323165 periodically hanging the hell out of slaves - ubuntu-1 is offline waiting for the host to be powercycled, since it's currently hung due to that bug. My apologies for any inconvenience caused by interrupting builds, but given how thoroughly this borks build hosts, and how long a delay there can be before a host gets powercycled when it gets hung like this, I wanted to make sure we quash the problem going forward.
A.