Add extra protection

Author: sebmarkbage

packages/react-server/src/ReactFlightReplyServer.js

@@ -131,8 +131,10 @@ ReactPromise.prototype.then = function <T>(
         let inspectedValue = chunk.value;
         // Recursively check if the value is itself a ReactPromise and if so if it points
         // back to itself. This helps catch recursive thenables early error.
+        let cycleProtection = 0;
         while (inspectedValue instanceof ReactPromise) {
-          if (inspectedValue === chunk) {
+          cycleProtection++;
+          if (inspectedValue === chunk || cycleProtection > 1000) {
             if (typeof reject === 'function') {
               reject(new Error('Cannot have cyclic thenables.'));
             }