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Merged
merged 5 commits into from
Jul 18, 2025
Merged

Properly handle hanging promise rejections during prerendering #81754

merged 5 commits into from
Jul 18, 2025
+272 −103

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unstubbable
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@unstubbable unstubbable commented Jul 17, 2025 •
edited
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We are using hanging promises for excluding request-specific data from a prerender. When prerendering is aborted, we reject all hanging promises. In dev mode, React uses these rejections to construct more detailed owner stacks. This allows us to provide better errors during the prerender validation.

For this to work reliably, we need to ensure that all hanging promises are rejected after React's rendering is aborted. However, some hanging promises are created before React starts rendering (when creating the RSC component tree). Furthermore, for memory reasons, the first hanging promise adds a single abort listener that's shared with all subsequent hanging promises (see #77480). In this case, the shared abort listener for rejections is added before React can add its own abort listener.

When using the same abort signal for both the React render and the hanging promises, the hanging promises would be rejected too early, preventing React from properly constructing the owner stacks.

To ensure that the order of operations is correct, we now use a separate abort signal for React's rendering that is aborted before the "render signal" 1, which is used by the hanging promises, is aborted. For parity, we're doing this not only in dev mode but also in production mode, so that the hanging promise rejection handling is always the same.

Technically, I don't think this change is necessary for the SSR prerender pass, but it felt cleaner to apply it there as well. However, we could revisit that when we properly split the two prerender stores. For example, the cacheSignal and prerenderResumeDataCache also don't need to be present on the client prerender store.

Reverts #81501.

Footnotes

  1. This is an unfortunate name clash. We could also call this one "cache signal", which would be in line with React.cacheSignal() – its potential successor. But that clashes with our current cacheSignal, which tracks the cache reads. We might revisit this naming problem in a future PR. ↩

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ijjk commented Jul 17, 2025 •
edited
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Stats from current PR

Default Build (Increase detected ⚠️)
General Overall increase ⚠️
vercel/next.js canary vercel/next.js hl/fix-hanging-promise-timing Change
buildDuration 18.5s 16.9s N/A
buildDurationCached 16s 13.8s N/A
nodeModulesSize 441 MB 441 MB ⚠️ +171 kB
nextStartRea..uration (ms) 417ms 411ms N/A
Client Bundles (main, webpack) Overall increase ⚠️
vercel/next.js canary vercel/next.js hl/fix-hanging-promise-timing Change
194b18f3-HASH.js gzip 54.1 kB 54.1 kB ✓
2192.HASH.js gzip 169 B 169 B ✓
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webpack-HASH.js gzip 1.71 kB 1.71 kB N/A
Overall change 134 kB 135 kB ⚠️ +670 B
Legacy Client Bundles (polyfills)
vercel/next.js canary vercel/next.js hl/fix-hanging-promise-timing Change
polyfills-HASH.js gzip 39.4 kB 39.4 kB ✓
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Client Pages
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_app-HASH.js gzip 193 B 193 B ✓
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Client Build Manifests
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Rendered Page Sizes
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Edge SSR bundle Size
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edge-ssr.js gzip 121 kB 121 kB N/A
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Overall change 0 B 0 B ✓
Middleware size
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middleware-b..fest.js gzip 678 B 676 B N/A
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middleware.js gzip 32.4 kB 32.4 kB N/A
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Next Runtimes Overall increase ⚠️
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app-page-exp...dev.js gzip 277 kB 277 kB ⚠️ +203 B
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app-page.run..prod.js gzip 148 kB 148 kB N/A
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build cache
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Diff details
Diff for page.js

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Diff for middleware.js

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Diff for edge-ssr.js

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+      __webpack_exports__,
+      __webpack_require__
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-      /***/
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+      __unused_webpack_exports,
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+      (window.__NEXT_P = window.__NEXT_P || []).push([
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+
+      /***/
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-    /***/ 2514: /***/ (
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+          ((_config_qualities = config.qualities) == null
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+      // We use this to determine if the import is the default loader
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+        // But this can cause us to leak a cleanup-ref into user code (e.g. via `<Link legacyBehavior>`),
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+        // (because it hasn't been updated for React 19)
+        // which can then cause things to blow up, because a cleanup-returning ref gets called with `null`.
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+        return (0, _react.useCallback)(
+          (current) => {
+            if (current === null) {
+              const cleanupFnA = cleanupA.current;
+              if (cleanupFnA) {
+                cleanupA.current = null;
+                cleanupFnA();
+              }
+              const cleanupFnB = cleanupB.current;
+              if (cleanupFnB) {
+                cleanupB.current = null;
+                cleanupFnB();
+              }
+            } else {
+              if (refA) {
+                cleanupA.current = applyRef(refA, current);
+              }
+              if (refB) {
+                cleanupB.current = applyRef(refB, current);
+              }
+            }
+          },
+          [refA, refB]
+        );
+      }
+      function applyRef(refA, current) {
+        if (typeof refA === "function") {
+          const cleanup = refA(current);
+          if (typeof cleanup === "function") {
+            return cleanup;
+          } else {
+            return () => refA(null);
+          }
+        } else {
+          refA.current = current;
+          return () => {
+            refA.current = null;
+          };
+        }
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=use-merged-ref.js.map
+
+      /***/
+    },
+
+    /***/ 3353: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5526);
+
+      /***/
+    },
+
+    /***/ 3594: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      // ESM COMPAT FLAG
+      __webpack_require__.r(__webpack_exports__);
+
+      // EXPORTS
+      __webpack_require__.d(__webpack_exports__, {
+        __N_SSP: () => /* binding */ __N_SSP,
+        default: () => /* binding */ pages_image,
+      });
+
+      // EXTERNAL MODULE: ./node_modules/.pnpm/[email protected]/node_modules/react/jsx-runtime.js
+      var jsx_runtime = __webpack_require__(5640);
+      // EXTERNAL MODULE: ./node_modules/.pnpm/next@[email protected][email protected][email protected]/node_modules/next/image.js
+      var next_image = __webpack_require__(3353);
+      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
+      /* harmony default export */ const nextjs = {
+        src: "/_next/static/media/nextjs.cae0b805.png",
+        height: 1347,
+        width: 1626,
+        blurDataURL:
+          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
+        blurWidth: 8,
+        blurHeight: 7,
+      }; // ./pages/image.js
+      function ImagePage(props) {
+        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
+          children: [
+            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
+              children: "next/image example",
+            }),
+            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
+              src: nextjs,
+              placeholder: "blur",
+            }),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const pages_image = ImagePage;
+
+      /***/
+    },
+
+    /***/ 3854: /***/ (
       __unused_webpack_module,
       exports,
       __webpack_require__
@@ -34,9 +217,9 @@
           return getImgProps;
         },
       });
-      const _warnonce = __webpack_require__(5127);
-      const _imageblursvg = __webpack_require__(4287);
-      const _imageconfig = __webpack_require__(2795);
+      const _warnonce = __webpack_require__(3603);
+      const _imageblursvg = __webpack_require__(7835);
+      const _imageconfig = __webpack_require__(6799);
       const VALID_LOADING_VALUES =
         /* unused pure expression or super */ null && [
           "lazy",
@@ -463,55 +646,69 @@
       /***/
     },
 
-    /***/ 3444: /***/ (
+    /***/ 5526: /***/ (
       __unused_webpack_module,
-      __webpack_exports__,
+      exports,
       __webpack_require__
     ) => {
       "use strict";
-      // ESM COMPAT FLAG
-      __webpack_require__.r(__webpack_exports__);
 
-      // EXPORTS
-      __webpack_require__.d(__webpack_exports__, {
-        __N_SSP: () => /* binding */ __N_SSP,
-        default: () => /* binding */ pages_image,
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
       });
-
-      // EXTERNAL MODULE: ./node_modules/.pnpm/[email protected]/node_modules/react/jsx-runtime.js
-      var jsx_runtime = __webpack_require__(5640);
-      // EXTERNAL MODULE: ./node_modules/.pnpm/next@[email protected][email protected][email protected]/node_modules/next/image.js
-      var next_image = __webpack_require__(6359);
-      var image_default = /*#__PURE__*/ __webpack_require__.n(next_image); // ./pages/nextjs.png
-      /* harmony default export */ const nextjs = {
-        src: "/_next/static/media/nextjs.cae0b805.png",
-        height: 1347,
-        width: 1626,
-        blurDataURL:
-          "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAHCAMAAAACh/xsAAAAD1BMVEX////x8fH6+vrb29vo6Oh8o70bAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAH0lEQVR4nGNgwARMjIyMjCAGCzMzMwsTRISJCcRABwAEcAAkLCQfgAAAAABJRU5ErkJggg==",
-        blurWidth: 8,
-        blurHeight: 7,
-      }; // ./pages/image.js
-      function ImagePage(props) {
-        return /*#__PURE__*/ (0, jsx_runtime.jsxs)(jsx_runtime.Fragment, {
-          children: [
-            /*#__PURE__*/ (0, jsx_runtime.jsx)("h1", {
-              children: "next/image example",
-            }),
-            /*#__PURE__*/ (0, jsx_runtime.jsx)(image_default(), {
-              src: nextjs,
-              placeholder: "blur",
-            }),
-          ],
+      0 && 0;
+      function _export(target, all) {
+        for (var name in all)
+          Object.defineProperty(target, name, {
+            enumerable: true,
+            get: all[name],
+          });
+      }
+      _export(exports, {
+        default: function () {
+          return _default;
+        },
+        getImageProps: function () {
+          return getImageProps;
+        },
+      });
+      const _interop_require_default = __webpack_require__(1532);
+      const _getimgprops = __webpack_require__(3854);
+      const _imagecomponent = __webpack_require__(8350);
+      const _imageloader = /*#__PURE__*/ _interop_require_default._(
+        __webpack_require__(1206)
+      );
+      function getImageProps(imgProps) {
+        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
+          defaultLoader: _imageloader.default,
+          // This is replaced by webpack define plugin
+          imgConf: {
+            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
+            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
+            path: "/_next/image",
+            loader: "default",
+            dangerouslyAllowSVG: false,
+            unoptimized: false,
+          },
         });
+        // Normally we don't care about undefined props because we pass to JSX,
+        // but this exported function could be used by the end user for anything
+        // so we delete undefined props to clean it up a little.
+        for (const [key, value] of Object.entries(props)) {
+          if (value === undefined) {
+            delete props[key];
+          }
+        }
+        return {
+          props,
+        };
       }
-      var __N_SSP = true;
-      /* harmony default export */ const pages_image = ImagePage;
+      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
 
       /***/
     },
 
-    /***/ 4287: /***/ (__unused_webpack_module, exports) => {
+    /***/ 7835: /***/ (__unused_webpack_module, exports) => {
       "use strict";
       /**
        * A shared function, used on both client and server, to generate a SVG blur placeholder.
@@ -566,85 +763,7 @@
       /***/
     },
 
-    /***/ 4985: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "useMergedRef", {
-        enumerable: true,
-        get: function () {
-          return useMergedRef;
-        },
-      });
-      const _react = __webpack_require__(148);
-      function useMergedRef(refA, refB) {
-        const cleanupA = (0, _react.useRef)(null);
-        const cleanupB = (0, _react.useRef)(null);
-        // NOTE: In theory, we could skip the wrapping if only one of the refs is non-null.
-        // (this happens often if the user doesn't pass a ref to Link/Form/Image)
-        // But this can cause us to leak a cleanup-ref into user code (e.g. via `<Link legacyBehavior>`),
-        // and the user might pass that ref into ref-merging library that doesn't support cleanup refs
-        // (because it hasn't been updated for React 19)
-        // which can then cause things to blow up, because a cleanup-returning ref gets called with `null`.
-        // So in practice, it's safer to be defensive and always wrap the ref, even on React 19.
-        return (0, _react.useCallback)(
-          (current) => {
-            if (current === null) {
-              const cleanupFnA = cleanupA.current;
-              if (cleanupFnA) {
-                cleanupA.current = null;
-                cleanupFnA();
-              }
-              const cleanupFnB = cleanupB.current;
-              if (cleanupFnB) {
-                cleanupB.current = null;
-                cleanupFnB();
-              }
-            } else {
-              if (refA) {
-                cleanupA.current = applyRef(refA, current);
-              }
-              if (refB) {
-                cleanupB.current = applyRef(refB, current);
-              }
-            }
-          },
-          [refA, refB]
-        );
-      }
-      function applyRef(refA, current) {
-        if (typeof refA === "function") {
-          const cleanup = refA(current);
-          if (typeof cleanup === "function") {
-            return cleanup;
-          } else {
-            return () => refA(null);
-          }
-        } else {
-          refA.current = current;
-          return () => {
-            refA.current = null;
-          };
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=use-merged-ref.js.map
-
-      /***/
-    },
-
-    /***/ 5898: /***/ (module, exports, __webpack_require__) => {
+    /***/ 8350: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -666,17 +785,17 @@
         __webpack_require__(7897)
       );
       const _head = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5207)
+        __webpack_require__(8843)
       );
-      const _getimgprops = __webpack_require__(2514);
-      const _imageconfig = __webpack_require__(2795);
-      const _imageconfigcontextsharedruntime = __webpack_require__(2349);
-      const _warnonce = __webpack_require__(5127);
-      const _routercontextsharedruntime = __webpack_require__(3556);
+      const _getimgprops = __webpack_require__(3854);
+      const _imageconfig = __webpack_require__(6799);
+      const _imageconfigcontextsharedruntime = __webpack_require__(3905);
+      const _warnonce = __webpack_require__(3603);
+      const _routercontextsharedruntime = __webpack_require__(6712);
       const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
+        __webpack_require__(1206)
       );
-      const _usemergedref = __webpack_require__(4985);
+      const _usemergedref = __webpack_require__(1765);
       // This is replaced by webpack define plugin
       const configEnv = {
         deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
@@ -1001,132 +1120,13 @@
 
       /***/
     },
-
-    /***/ 5970: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "default", {
-        enumerable: true,
-        get: function () {
-          return _default;
-        },
-      });
-      const DEFAULT_Q = 75;
-      function defaultLoader(param) {
-        let { config, src, width, quality } = param;
-        var _config_qualities;
-        if (false) {
-        }
-        const q =
-          quality ||
-          ((_config_qualities = config.qualities) == null
-            ? void 0
-            : _config_qualities.reduce((prev, cur) =>
-                Math.abs(cur - DEFAULT_Q) < Math.abs(prev - DEFAULT_Q)
-                  ? cur
-                  : prev
-              )) ||
-          DEFAULT_Q;
-        return (
-          config.path +
-          "?url=" +
-          encodeURIComponent(src) +
-          "&w=" +
-          width +
-          "&q=" +
-          q +
-          (src.startsWith("/_next/static/media/") && false ? 0 : "")
-        );
-      }
-      // We use this to determine if the import is the default loader
-      // or a custom loader defined by the user in next.config.js
-      defaultLoader.__next_img_default = true;
-      const _default = defaultLoader; //# sourceMappingURL=image-loader.js.map
-
-      /***/
-    },
-
-    /***/ 6359: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(8986);
-
-      /***/
-    },
-
-    /***/ 8986: /***/ (
-      __unused_webpack_module,
-      exports,
-      __webpack_require__
-    ) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      0 && 0;
-      function _export(target, all) {
-        for (var name in all)
-          Object.defineProperty(target, name, {
-            enumerable: true,
-            get: all[name],
-          });
-      }
-      _export(exports, {
-        default: function () {
-          return _default;
-        },
-        getImageProps: function () {
-          return getImageProps;
-        },
-      });
-      const _interop_require_default = __webpack_require__(1532);
-      const _getimgprops = __webpack_require__(2514);
-      const _imagecomponent = __webpack_require__(5898);
-      const _imageloader = /*#__PURE__*/ _interop_require_default._(
-        __webpack_require__(5970)
-      );
-      function getImageProps(imgProps) {
-        const { props } = (0, _getimgprops.getImgProps)(imgProps, {
-          defaultLoader: _imageloader.default,
-          // This is replaced by webpack define plugin
-          imgConf: {
-            deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
-            imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
-            path: "/_next/image",
-            loader: "default",
-            dangerouslyAllowSVG: false,
-            unoptimized: false,
-          },
-        });
-        // Normally we don't care about undefined props because we pass to JSX,
-        // but this exported function could be used by the end user for anything
-        // so we delete undefined props to clean it up a little.
-        for (const [key, value] of Object.entries(props)) {
-          if (value === undefined) {
-            delete props[key];
-          }
-        }
-        return {
-          props,
-        };
-      }
-      const _default = _imagecomponent.Image; //# sourceMappingURL=image-external.js.map
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(2198)
+      __webpack_exec__(264)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for index-HASH.js 
@@ -1,7 +1,24 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3332],
   {
-    /***/ 9418: /***/ (
+    /***/ 8230: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/",
+        function () {
+          return __webpack_require__(8696);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 8696: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -19,30 +36,13 @@
 
       /***/
     },
-
-    /***/ 9532: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/",
-        function () {
-          return __webpack_require__(9418);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9532)
+      __webpack_exec__(8230)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for link-HASH.js 
@@ -1,125 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [4672],
   {
-    /***/ 1854: /***/ (
-      __unused_webpack_module,
-      __webpack_exports__,
-      __webpack_require__
-    ) => {
-      "use strict";
-      __webpack_require__.r(__webpack_exports__);
-      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
-        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
-        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
-        /* harmony export */
-      });
-      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
-        __webpack_require__(5640);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8770);
-      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
-        /*#__PURE__*/ __webpack_require__.n(
-          next_link__WEBPACK_IMPORTED_MODULE_1__
-        );
-
-      function aLink(props) {
-        return /*#__PURE__*/ (0,
-        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
-          children: [
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
-              children: "A Link page!",
-            }),
-            /*#__PURE__*/ (0,
-            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
-              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
-              {
-                href: "/",
-                children: "Go to /",
-              }
-            ),
-          ],
-        });
-      }
-      var __N_SSP = true;
-      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
-
-      /***/
-    },
-
-    /***/ 3199: /***/ (__unused_webpack_module, exports) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "errorOnce", {
-        enumerable: true,
-        get: function () {
-          return errorOnce;
-        },
-      });
-      let errorOnce = (_) => {};
-      if (false) {
-      } //# sourceMappingURL=error-once.js.map
-
-      /***/
-    },
-
-    /***/ 3568: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/link",
-        function () {
-          return __webpack_require__(1854);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 3857: /***/ (module, exports, __webpack_require__) => {
-      "use strict";
-
-      Object.defineProperty(exports, "__esModule", {
-        value: true,
-      });
-      Object.defineProperty(exports, "getDomainLocale", {
-        enumerable: true,
-        get: function () {
-          return getDomainLocale;
-        },
-      });
-      const _normalizetrailingslash = __webpack_require__(4869);
-      const basePath =
-        /* unused pure expression or super */ null && (false || "");
-      function getDomainLocale(path, locale, locales, domainLocales) {
-        if (false) {
-        } else {
-          return false;
-        }
-      }
-      if (
-        (typeof exports.default === "function" ||
-          (typeof exports.default === "object" && exports.default !== null)) &&
-        typeof exports.default.__esModule === "undefined"
-      ) {
-        Object.defineProperty(exports.default, "__esModule", {
-          value: true,
-        });
-        Object.assign(exports.default, exports);
-        module.exports = exports.default;
-      } //# sourceMappingURL=get-domain-locale.js.map
-
-      /***/
-    },
-
-    /***/ 3947: /***/ (module, exports, __webpack_require__) => {
+    /***/ 591: /***/ (module, exports, __webpack_require__) => {
       "use strict";
       /* __next_internal_client_entry_do_not_use__  cjs */
       Object.defineProperty(exports, "__esModule", {
@@ -146,17 +28,17 @@
       const _react = /*#__PURE__*/ _interop_require_wildcard._(
         __webpack_require__(148)
       );
-      const _resolvehref = __webpack_require__(3161);
-      const _islocalurl = __webpack_require__(2309);
-      const _formaturl = __webpack_require__(3768);
-      const _utils = __webpack_require__(5554);
-      const _addlocale = __webpack_require__(7591);
-      const _routercontextsharedruntime = __webpack_require__(3556);
-      const _useintersection = __webpack_require__(5624);
-      const _getdomainlocale = __webpack_require__(3857);
-      const _addbasepath = __webpack_require__(4356);
-      const _usemergedref = __webpack_require__(4985);
-      const _erroronce = __webpack_require__(3199);
+      const _resolvehref = __webpack_require__(5837);
+      const _islocalurl = __webpack_require__(5953);
+      const _formaturl = __webpack_require__(6212);
+      const _utils = __webpack_require__(6950);
+      const _addlocale = __webpack_require__(6467);
+      const _routercontextsharedruntime = __webpack_require__(6712);
+      const _useintersection = __webpack_require__(9692);
+      const _getdomainlocale = __webpack_require__(6850);
+      const _addbasepath = __webpack_require__(4928);
+      const _usemergedref = __webpack_require__(1765);
+      const _erroronce = __webpack_require__(8659);
       const prefetched = new Set();
       function prefetch(router, href, as, options) {
         if (false) {
@@ -545,7 +427,17 @@
       /***/
     },
 
-    /***/ 4985: /***/ (module, exports, __webpack_require__) => {
+    /***/ 1148: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(591);
+
+      /***/
+    },
+
+    /***/ 1765: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -623,7 +515,125 @@
       /***/
     },
 
-    /***/ 5624: /***/ (module, exports, __webpack_require__) => {
+    /***/ 5436: /***/ (
+      __unused_webpack_module,
+      __webpack_exports__,
+      __webpack_require__
+    ) => {
+      "use strict";
+      __webpack_require__.r(__webpack_exports__);
+      /* harmony export */ __webpack_require__.d(__webpack_exports__, {
+        /* harmony export */ __N_SSP: () => /* binding */ __N_SSP,
+        /* harmony export */ default: () => __WEBPACK_DEFAULT_EXPORT__,
+        /* harmony export */
+      });
+      /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
+        __webpack_require__(5640);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1__ =
+        __webpack_require__(1148);
+      /* harmony import */ var next_link__WEBPACK_IMPORTED_MODULE_1___default =
+        /*#__PURE__*/ __webpack_require__.n(
+          next_link__WEBPACK_IMPORTED_MODULE_1__
+        );
+
+      function aLink(props) {
+        return /*#__PURE__*/ (0,
+        react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsxs)("div", {
+          children: [
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)("h3", {
+              children: "A Link page!",
+            }),
+            /*#__PURE__*/ (0,
+            react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__.jsx)(
+              next_link__WEBPACK_IMPORTED_MODULE_1___default(),
+              {
+                href: "/",
+                children: "Go to /",
+              }
+            ),
+          ],
+        });
+      }
+      var __N_SSP = true;
+      /* harmony default export */ const __WEBPACK_DEFAULT_EXPORT__ = aLink;
+
+      /***/
+    },
+
+    /***/ 6850: /***/ (module, exports, __webpack_require__) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "getDomainLocale", {
+        enumerable: true,
+        get: function () {
+          return getDomainLocale;
+        },
+      });
+      const _normalizetrailingslash = __webpack_require__(6457);
+      const basePath =
+        /* unused pure expression or super */ null && (false || "");
+      function getDomainLocale(path, locale, locales, domainLocales) {
+        if (false) {
+        } else {
+          return false;
+        }
+      }
+      if (
+        (typeof exports.default === "function" ||
+          (typeof exports.default === "object" && exports.default !== null)) &&
+        typeof exports.default.__esModule === "undefined"
+      ) {
+        Object.defineProperty(exports.default, "__esModule", {
+          value: true,
+        });
+        Object.assign(exports.default, exports);
+        module.exports = exports.default;
+      } //# sourceMappingURL=get-domain-locale.js.map
+
+      /***/
+    },
+
+    /***/ 8659: /***/ (__unused_webpack_module, exports) => {
+      "use strict";
+
+      Object.defineProperty(exports, "__esModule", {
+        value: true,
+      });
+      Object.defineProperty(exports, "errorOnce", {
+        enumerable: true,
+        get: function () {
+          return errorOnce;
+        },
+      });
+      let errorOnce = (_) => {};
+      if (false) {
+      } //# sourceMappingURL=error-once.js.map
+
+      /***/
+    },
+
+    /***/ 9666: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/link",
+        function () {
+          return __webpack_require__(5436);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9692: /***/ (module, exports, __webpack_require__) => {
       "use strict";
 
       Object.defineProperty(exports, "__esModule", {
@@ -636,7 +646,7 @@
         },
       });
       const _react = __webpack_require__(148);
-      const _requestidlecallback = __webpack_require__(3543);
+      const _requestidlecallback = __webpack_require__(315);
       const hasIntersectionObserver =
         typeof IntersectionObserver === "function";
       const observers = new Map();
@@ -748,23 +758,13 @@
 
       /***/
     },
-
-    /***/ 8770: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(3947);
-
-      /***/
-    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(3568)
+      __webpack_exec__(9666)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for routerDirect-HASH.js 
@@ -1,7 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [188],
   {
-    /***/ 3618: /***/ (
+    /***/ 76: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -16,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -36,17 +36,7 @@
       /***/
     },
 
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 7824: /***/ (
+    /***/ 1810: /***/ (
       __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
@@ -54,7 +44,7 @@
       (window.__NEXT_P = window.__NEXT_P || []).push([
         "/routerDirect",
         function () {
-          return __webpack_require__(3618);
+          return __webpack_require__(76);
         },
       ]);
       if (false) {
@@ -62,13 +52,23 @@
 
       /***/
     },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(7824)
+      __webpack_exec__(1810)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for script-HASH.js 
@@ -1,24 +1,17 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [1209],
   {
-    /***/ 1984: /***/ (
-      __unused_webpack_module,
+    /***/ 2227: /***/ (
+      module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/script",
-        function () {
-          return __webpack_require__(5769);
-        },
-      ]);
-      if (false) {
-      }
+      module.exports = __webpack_require__(5984);
 
       /***/
     },
 
-    /***/ 5769: /***/ (
+    /***/ 3043: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -33,7 +26,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(8293);
+        __webpack_require__(2227);
       /* harmony import */ var next_script__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_script__WEBPACK_IMPORTED_MODULE_1__
@@ -66,12 +59,19 @@
       /***/
     },
 
-    /***/ 8293: /***/ (
-      module,
+    /***/ 3642: /***/ (
+      __unused_webpack_module,
       __unused_webpack_exports,
       __webpack_require__
     ) => {
-      module.exports = __webpack_require__(900);
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/script",
+        function () {
+          return __webpack_require__(3043);
+        },
+      ]);
+      if (false) {
+      }
 
       /***/
     },
@@ -81,7 +81,7 @@
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(1984)
+      __webpack_exec__(3642)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
Diff for withRouter-HASH.js 
@@ -1,34 +1,7 @@
 (self["webpackChunk_N_E"] = self["webpackChunk_N_E"] || []).push([
   [3263],
   {
-    /***/ 4631: /***/ (
-      module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      module.exports = __webpack_require__(7086);
-
-      /***/
-    },
-
-    /***/ 9216: /***/ (
-      __unused_webpack_module,
-      __unused_webpack_exports,
-      __webpack_require__
-    ) => {
-      (window.__NEXT_P = window.__NEXT_P || []).push([
-        "/withRouter",
-        function () {
-          return __webpack_require__(9803);
-        },
-      ]);
-      if (false) {
-      }
-
-      /***/
-    },
-
-    /***/ 9803: /***/ (
+    /***/ 1089: /***/ (
       __unused_webpack_module,
       __webpack_exports__,
       __webpack_require__
@@ -43,7 +16,7 @@
       /* harmony import */ var react_jsx_runtime__WEBPACK_IMPORTED_MODULE_0__ =
         __webpack_require__(5640);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1__ =
-        __webpack_require__(4631);
+        __webpack_require__(9413);
       /* harmony import */ var next_router__WEBPACK_IMPORTED_MODULE_1___default =
         /*#__PURE__*/ __webpack_require__.n(
           next_router__WEBPACK_IMPORTED_MODULE_1__
@@ -61,13 +34,40 @@
 
       /***/
     },
+
+    /***/ 3962: /***/ (
+      __unused_webpack_module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      (window.__NEXT_P = window.__NEXT_P || []).push([
+        "/withRouter",
+        function () {
+          return __webpack_require__(1089);
+        },
+      ]);
+      if (false) {
+      }
+
+      /***/
+    },
+
+    /***/ 9413: /***/ (
+      module,
+      __unused_webpack_exports,
+      __webpack_require__
+    ) => {
+      module.exports = __webpack_require__(5282);
+
+      /***/
+    },
   },
   /******/ (__webpack_require__) => {
     // webpackRuntimeModules
     /******/ var __webpack_exec__ = (moduleId) =>
       __webpack_require__((__webpack_require__.s = moduleId));
     /******/ __webpack_require__.O(0, [636, 6593, 8792], () =>
-      __webpack_exec__(9216)
+      __webpack_exec__(3962)
     );
     /******/ var __webpack_exports__ = __webpack_require__.O();
     /******/ _N_E = __webpack_exports__;
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Commit: 116846c

@unstubbable unstubbable marked this pull request as ready for review July 17, 2025 10:04
@unstubbable unstubbable requested review from sebmarkbage and gnoff July 17, 2025 10:04
sebmarkbage
sebmarkbage reviewed Jul 17, 2025
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ijjk commented Jul 17, 2025 •
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sebmarkbage
sebmarkbage previously approved these changes Jul 17, 2025
View reviewed changes
@unstubbable unstubbable dismissed sebmarkbage’s stale review July 17, 2025 18:30

Based on a faulty version.

@unstubbable unstubbable requested a review from sebmarkbage July 17, 2025 18:37
@unstubbable
Revert "Improve reliability of owner stacks for async I/O errors (#81501
2eef409 
)"

This reverts commit 465c221.
@unstubbable
Properly handle hanging promise rejections during prerendering
dd4589e 
We are using hanging promises for excluding request-specific data from a
prerender. When prerendering is aborted, we reject all hanging promises.
In dev mode, React uses these rejections to construct more detailed
owner stacks. This allows us to provide better errors during the
prerender validation.

For this to work reliably, we need to ensure that all hanging promises
are aborted after React's rendering is aborted. However, some hanging
promises are created before React starts rendering (when creating the
RSC component tree). Furthermore, for memory reasons, the first hanging
promise adds a single abort listener that's shared with all subsequent
hanging promises (see #77480). In this case, the shared abort listener
for rejections is added before React can add its own abort listener.

When using the same abort signal for both the React render and the
hanging promises, the hanging promises would be rejected too early,
preventing React from properly constructing the owner stacks.

To ensure that the order of operations is correct, we now use a separate
abort signal for the hanging promises that is only aborted after the
render signal is aborted. For parity, we're doing this not only in dev
mode but also in production mode, so that the hanging promise rejection
handling is always the same.

Reverts #81501.
@unstubbable
Don't add a separate signal to the work unit store
30f716f
@unstubbable
Add an orchestrating controller to fix sync IO aborts
ab59d02
@unstubbable
Set up proper render signal chain
b72e7e8 
This avoids the need for an orchestrating controller.
@unstubbable unstubbable force-pushed the hl/fix-hanging-promise-timing branch from 116846c to b72e7e8 Compare July 18, 2025 07:07
@unstubbable unstubbable merged commit 2256b6b into canary Jul 18, 2025
160 of 162 checks passed
@unstubbable unstubbable deleted the hl/fix-hanging-promise-timing branch July 18, 2025 07:33
alii pushed a commit to Jarred-Sumner/next.js that referenced this pull request Jul 21, 2025
@unstubbable @alii
Properly handle hanging promise rejections during prerendering (verce…
a072853 
…l#81754)

We are using hanging promises for excluding request-specific data from a
prerender. When prerendering is aborted, we reject all hanging promises.
In dev mode, React uses these rejections to construct more detailed
owner stacks. This allows us to provide better errors during the
prerender validation.

For this to work reliably, we need to ensure that all hanging promises
are rejected after React's rendering is aborted. However, some hanging
promises are created before React starts rendering (when creating the
RSC component tree). Furthermore, for memory reasons, the first hanging
promise adds a single abort listener that's shared with all subsequent
hanging promises (see vercel#77480). In this case, the shared abort listener
for rejections is added before React can add its own abort listener.

When using the same abort signal for both the React render and the
hanging promises, the hanging promises would be rejected too early,
preventing React from properly constructing the owner stacks.

To ensure that the order of operations is correct, we now use a separate
abort signal for React's rendering that is aborted before the "render
signal" [^1], which is used by the hanging promises, is aborted. For
parity, we're doing this not only in dev mode but also in production
mode, so that the hanging promise rejection handling is always the same.

Technically, I don't think this change is necessary for the SSR
prerender pass, but it felt cleaner to apply it there as well. However,
we could revisit that when we properly split the two prerender stores.
For example, the `cacheSignal` and `prerenderResumeDataCache` also don't
need to be present on the client prerender store.

Reverts vercel#81501.

[^1]: This is an unfortunate name clash. We could also call this one
"cache signal", which would be in line with `React.cacheSignal()` – its
potential successor. But that clashes with our current `cacheSignal`,
which tracks the cache reads. We might revisit this naming problem in a
future PR.
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@gnoff gnoff gnoff approved these changes

@sebmarkbage sebmarkbage Awaiting requested review from sebmarkbage

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@unstubbable @ijjk @sebmarkbage @gnoff