Harbormaster acting up?

Hi devs, Is Harbormaster acting up? I saw today two out-of-memory failures, including this one (https://phabricator.haskell.org/harbormaster/build/9150/), which happens when building the stage-1 compiler. That means that an off-the-shelf GHC is the one that's running out of memory. Separately, a comments-only patch didn't validate (https://phabricator.haskell.org/harbormaster/build/9148/). Any hints? Thanks! Richard