On the waterfall, it appears as if build 1295 of tegra2_aebl started at 6:30am and finished at 7:09am, when build 1296 started. In fact, build 1295 continued until 9:03am, when it failed. At the time of the failure, build 1295 was not visible on the waterfall because there were three other builds that had started since then and the buildbot did not display this.

I discussed this with eblake in person and we discussed three possible ways to fix this:
  1. Update the waterfall to display multiple columns for the same build target when it is running multiple builds at once.
  2. Update buildbot to only run each build target on one machine at a time.
  3. Update the buildbot config to only have one machine per build target.

Any of the above solutions would be fine with me. (Labelling as TreeCloser so that sheriffs will be aware of this issue while it is being worked on.)