TSAN points out a data race in the replication coordinator. I have linked a temp fix that should get eyes on by the replication team. It is possible that this is a false positive and no REAL bug exists here.

https://github.com/10gen/mongo/pull/6846/files#r961984299

https://github.com/10gen/mongo/pull/6846/files#r961984439

https://github.com/10gen/mongo/pull/6846/files#r961984617

https://github.com/10gen/mongo/pull/6846/files#r961984717

This is putting the cart before the horse in a way because the failing bf has not been generated yet and should be linked when it is.