The following hangs at shutdown: (function() { const rst = new ReplSetTest({nodes: 1}); rst.startSet(); rst.initiate(); const session = rst.getPrimary().getDB( "test" ).getMongo().startSession(); const db = session.getDatabase( "test" ); for (let i = 0; i < 4; i++) { assert .commandWorked(db.coll.insert({_id: i}, {writeConcern: {w: "majority" }})); } const res = assert .commandWorked(db.runCommand( {find: "coll" , batchSize: 2, readConcern: {level: "snapshot" }, txnNumber: NumberLong(0)})); rst.stopSet(); }());