@mflatt does this look like a transient issue to you: https://github.com/racket/racket/runs/3356275908?check_suite_focus=true#step:4:5053 ? Here’s a second instance recently, but it doesn’t happen every time: https://github.com/racket/racket/runs/3356275908?check_suite_focus=true#step:4:5052

I think github actions CI is back to an ok state now.

This looks like an actual bug somewhere: https://github.com/racket/racket/runs/3355028717?check_suite_focus=true#step:13:42 Maybe caused by set iteration order?

I’m not sure. I’ve pushed a change that may help or may indirectly give us more information.