If one slave is taking a long time to finish a build and other newer builds have finished since the slow slave began its build, the TestFailures page will show failures from the build before the not-yet-finished build, rather than showing failures from the most-recently-finished build.
Created attachment 94848 [details] Don't assume that builds finish in the order they were started
Committed r87380: <http://trac.webkit.org/changeset/87380>
<rdar://problem/9515584>