Linux pre-merge builds broken?

I am seeing a build failure in a pre-merge Linux build (premerge checks #1584), but ninja-all.log does not show any failures. I see from the buildkite history that not all Linux builds are broken, but here’s another instance (premerge checks #1591) where nothing seems to have failed looking at ninja-all.log but that step is marked as failed.

Is there some build/infrastructure issue here?

Maybe: ?

Yes, looks like. Thanks.