1 files changed, 36 insertions, 0 deletions
diff --git a/jstests/replsets/get_more_before_initiate.js b/jstests/replsets/get_more_before_initiate.js
new file mode 100644
index 00000000000..67d9013df9a
--- /dev/null
+++ b/jstests/replsets/get_more_before_initiate.js
@@ -0,0 +1,36 @@
+/**
+ * SERVER-46365 In MongoDB v4.0, getMore commands check the featureCompatibilityVersion, but the
+ * featureCompatibiltyVersion does not get initialized in a replica set member until the replica set
+ * is initialized. The getMore command must not crash when it sees an uninitialized
+ * featureCompatibilityVersion, because it is possible to send a getMore to an uninitialized replica
+ * set member: for example, by reading the "local" database.
+ */
+(function() {
+    "use strict";
+
+    const rs = new ReplSetTest({name: "getMoreBeforeInitiateTest", nodes: 1});
+    rs.startSet();
+
+    // Before replica set initialization finishes, members reject getMore commands for any database
+    // other than the "local" database.
+    const db = rs.nodes[0].getDB("local");
+    const collName = "non_existent_collection";
+
+    // We use batch size 0 to ensure we get a cursor, even though there is no data in the
+    // collection.
+    const aggregateRes = assert.commandWorked(
+        db.runCommand({aggregate: collName, pipeline: [], cursor: {batchSize: 0}}));
+    assert(aggregateRes.hasOwnProperty("cursor"), aggregateRes);
+
+    // This getMore command will check the featureCompatibiltyVersion.
+    const getMoreRes = assert.commandWorked(
+        db.runCommand({getMore: aggregateRes.cursor.id, collection: collName}));
+
+    // This test is primarily testing that we don't crash, but we may as well also include a sanity
+    // check that we get back a correct (empty) result and exhausted cursor.
+    assert(getMoreRes.hasOwnProperty("cursor"), getMoreRes);
+    assert.eq(getMoreRes.cursor.id, 0, getMoreRes);
+    assert.eq(getMoreRes.cursor.nextBatch, [], getMoreRes);
+
+    rs.stopSet();
+}());
+\ No newline at end of file