When a build step times out, CircleCI generates a “Too long with no output” message in the output. If you’re viewing the build page when this occurs, you can see the output that the step generated prior to this message. However, if you load a build page where the timeout has already occurred, the only visible output is the “Too long with no output” message. Any of the output that may have helped you to diagnose the issue is irretrievably gone.
Test case here: https://circleci.com/gh/jfirebaugh/circle-ci-output-bug/2. I’ve been watching this build since it started, and can see the “A first hello” output. But all you will see is “Too long with no output”.