Bugfix: Synchronous ping during render phase sometimes unwinds the stack, leading to crash (#25851)

acdlite · acdlite · commit 769cfc729f96 · 2022-12-22T05:02:54.000Z
I found this bug when working on a different task. `pingSuspendedRoot` sometimes calls `prepareFreshStack` to interupt the work-in-progress tree and force a restart from the root. The idea is that if the current render is already in a state where it be blocked from committing, and there's new data that could unblock it, we might as well restart from the beginning. The problem is that this is only safe to do if `pingSuspendedRoot` is called from a non-React task, like an event handler or a microtask. While this is usually the case, it's entirely possible for a thenable to resolve (i.e. to call `pingSuspendedRoot`) synchronously while the render phase is already executing. If that happens, and work loop attempts to unwind the stack, it causes the render phase to crash. DiffTrain build for [5fcf1a4](5fcf1a4) [View git log for this commit](https://github.com/facebook/react/commits/5fcf1a4b4c2150a1b9fe0de0144a82a053c63966)
diff --git a/compiled/facebook-www/REVISION b/compiled/facebook-www/REVISION
@@ -1 +1 @@
-2b1fb91a55deb9b7b60452cb57184c2f182a42fd
+5fcf1a4b4c2150a1b9fe0de0144a82a053c63966
diff --git a/compiled/facebook-www/REVISION_TRANSFORMS b/compiled/facebook-www/REVISION_TRANSFORMS
@@ -1 +1 @@
-2b1fb91a55deb9b7b60452cb57184c2f182a42fd
+5fcf1a4b4c2150a1b9fe0de0144a82a053c63966
diff --git a/compiled/facebook-www/React-dev.classic.js b/compiled/facebook-www/React-dev.classic.js
@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
 // ATTENTION
 // When adding new symbols to this file,
diff --git a/compiled/facebook-www/React-dev.modern.js b/compiled/facebook-www/React-dev.modern.js
@@ -27,7 +27,7 @@ if (
 }
           "use strict";
 
-var ReactVersion = "18.3.0-www-modern-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-modern-5fcf1a4b4-20221221";
 
 // ATTENTION
 // When adding new symbols to this file,
diff --git a/compiled/facebook-www/React-prod.classic.js b/compiled/facebook-www/React-prod.classic.js
@@ -643,4 +643,4 @@ exports.useSyncExternalStore = function(
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-www-classic-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-classic-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/React-prod.modern.js b/compiled/facebook-www/React-prod.modern.js
@@ -635,4 +635,4 @@ exports.useSyncExternalStore = function(
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-www-modern-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-modern-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/React-profiling.classic.js b/compiled/facebook-www/React-profiling.classic.js
@@ -654,7 +654,7 @@ exports.useSyncExternalStore = function(
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-www-classic-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (
diff --git a/compiled/facebook-www/React-profiling.modern.js b/compiled/facebook-www/React-profiling.modern.js
@@ -646,7 +646,7 @@ exports.useSyncExternalStore = function(
   );
 };
 exports.useTransition = useTransition;
-exports.version = "18.3.0-www-modern-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-modern-5fcf1a4b4-20221221";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (
diff --git a/compiled/facebook-www/ReactART-dev.classic.js b/compiled/facebook-www/ReactART-dev.classic.js
@@ -69,7 +69,7 @@ function _assertThisInitialized(self) {
   return self;
 }
 
-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
 var LegacyRoot = 0;
 var ConcurrentRoot = 1;
@@ -25766,8 +25766,11 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
         includesOnlyRetries(workInProgressRootRenderLanes) &&
         now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
     ) {
-      // Restart from the root.
-      prepareFreshStack(root, NoLanes);
+      // Force a restart from the root by unwinding the stack. Unless this is
+      // being called from the render phase, because that would cause a crash.
+      if ((executionContext & RenderContext) === NoContext) {
+        prepareFreshStack(root, NoLanes);
+      }
     } else {
       // Even though we can't restart right now, we might get an
       // opportunity later. So we mark this render as having a ping.
diff --git a/compiled/facebook-www/ReactART-dev.modern.js b/compiled/facebook-www/ReactART-dev.modern.js
@@ -69,7 +69,7 @@ function _assertThisInitialized(self) {
   return self;
 }
 
-var ReactVersion = "18.3.0-www-modern-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-modern-5fcf1a4b4-20221221";
 
 var LegacyRoot = 0;
 var ConcurrentRoot = 1;
@@ -25455,8 +25455,11 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
         includesOnlyRetries(workInProgressRootRenderLanes) &&
         now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
     ) {
-      // Restart from the root.
-      prepareFreshStack(root, NoLanes);
+      // Force a restart from the root by unwinding the stack. Unless this is
+      // being called from the render phase, because that would cause a crash.
+      if ((executionContext & RenderContext) === NoContext) {
+        prepareFreshStack(root, NoLanes);
+      }
     } else {
       // Even though we can't restart right now, we might get an
       // opportunity later. So we mark this render as having a ping.
diff --git a/compiled/facebook-www/ReactART-prod.classic.js b/compiled/facebook-www/ReactART-prod.classic.js
@@ -8862,7 +8862,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -9827,7 +9827,7 @@ var slice = Array.prototype.slice,
       return null;
     },
     bundleType: 0,
-    version: "18.3.0-www-classic-2b1fb91a5-20221220",
+    version: "18.3.0-www-classic-5fcf1a4b4-20221221",
     rendererPackageName: "react-art"
   };
 var internals$jscomp$inline_1338 = {
@@ -9858,7 +9858,7 @@ var internals$jscomp$inline_1338 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1339 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/compiled/facebook-www/ReactART-prod.modern.js b/compiled/facebook-www/ReactART-prod.modern.js
@@ -8596,7 +8596,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -9494,7 +9494,7 @@ var slice = Array.prototype.slice,
       return null;
     },
     bundleType: 0,
-    version: "18.3.0-www-modern-2b1fb91a5-20221220",
+    version: "18.3.0-www-modern-5fcf1a4b4-20221221",
     rendererPackageName: "react-art"
   };
 var internals$jscomp$inline_1329 = {
@@ -9525,7 +9525,7 @@ var internals$jscomp$inline_1329 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1330 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/compiled/facebook-www/ReactDOM-dev.classic.js b/compiled/facebook-www/ReactDOM-dev.classic.js
@@ -40807,8 +40807,11 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
         includesOnlyRetries(workInProgressRootRenderLanes) &&
         now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
     ) {
-      // Restart from the root.
-      prepareFreshStack(root, NoLanes);
+      // Force a restart from the root by unwinding the stack. Unless this is
+      // being called from the render phase, because that would cause a crash.
+      if ((executionContext & RenderContext) === NoContext) {
+        prepareFreshStack(root, NoLanes);
+      }
     } else {
       // Even though we can't restart right now, we might get an
       // opportunity later. So we mark this render as having a ping.
@@ -42643,7 +42646,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
 function createPortal(
   children,
diff --git a/compiled/facebook-www/ReactDOM-dev.modern.js b/compiled/facebook-www/ReactDOM-dev.modern.js
@@ -40531,8 +40531,11 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
         includesOnlyRetries(workInProgressRootRenderLanes) &&
         now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
     ) {
-      // Restart from the root.
-      prepareFreshStack(root, NoLanes);
+      // Force a restart from the root by unwinding the stack. Unless this is
+      // being called from the render phase, because that would cause a crash.
+      if ((executionContext & RenderContext) === NoContext) {
+        prepareFreshStack(root, NoLanes);
+      }
     } else {
       // Even though we can't restart right now, we might get an
       // opportunity later. So we mark this render as having a ping.
@@ -42367,7 +42370,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-modern-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-modern-5fcf1a4b4-20221221";
 
 function createPortal(
   children,
diff --git a/compiled/facebook-www/ReactDOM-prod.classic.js b/compiled/facebook-www/ReactDOM-prod.classic.js
@@ -14222,7 +14222,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -15580,7 +15580,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1770 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-classic-2b1fb91a5-20221220",
+  version: "18.3.0-www-classic-5fcf1a4b4-20221221",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2157 = {
@@ -15610,7 +15610,7 @@ var internals$jscomp$inline_2157 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2158 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -15852,4 +15852,4 @@ exports.unstable_renderSubtreeIntoContainer = function(
   );
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-next-2b1fb91a5-20221220";
+exports.version = "18.3.0-next-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/ReactDOM-prod.modern.js b/compiled/facebook-www/ReactDOM-prod.modern.js
@@ -14000,7 +14000,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -15141,7 +15141,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1738 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-2b1fb91a5-20221220",
+  version: "18.3.0-www-modern-5fcf1a4b4-20221221",
   rendererPackageName: "react-dom"
 };
 var internals$jscomp$inline_2132 = {
@@ -15172,7 +15172,7 @@ var internals$jscomp$inline_2132 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_2133 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -15360,4 +15360,4 @@ exports.unstable_flushControlled = function(fn) {
   }
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-next-2b1fb91a5-20221220";
+exports.version = "18.3.0-next-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/ReactDOM-profiling.classic.js b/compiled/facebook-www/ReactDOM-profiling.classic.js
@@ -14958,7 +14958,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -16352,7 +16352,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1844 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-classic-2b1fb91a5-20221220",
+  version: "18.3.0-www-classic-5fcf1a4b4-20221221",
   rendererPackageName: "react-dom"
 };
 (function(internals) {
@@ -16396,7 +16396,7 @@ var devToolsConfig$jscomp$inline_1844 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 });
 assign(Internals, {
   ReactBrowserEventEmitter: {
@@ -16625,7 +16625,7 @@ exports.unstable_renderSubtreeIntoContainer = function(
   );
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-next-2b1fb91a5-20221220";
+exports.version = "18.3.0-next-5fcf1a4b4-20221221";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (
diff --git a/compiled/facebook-www/ReactDOM-profiling.modern.js b/compiled/facebook-www/ReactDOM-profiling.modern.js
@@ -14726,7 +14726,7 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
       (workInProgressRootRenderLanes & 125829120) ===
         workInProgressRootRenderLanes &&
       500 > now() - globalMostRecentFallbackTime)
-      ? prepareFreshStack(root, 0)
+      ? 0 === (executionContext & 2) && prepareFreshStack(root, 0)
       : (workInProgressRootPingedLanes |= pingedLanes));
   ensureRootIsScheduled(root, wakeable);
 }
@@ -15903,7 +15903,7 @@ Internals.Events = [
 var devToolsConfig$jscomp$inline_1812 = {
   findFiberByHostInstance: getClosestInstanceFromNode,
   bundleType: 0,
-  version: "18.3.0-www-modern-2b1fb91a5-20221220",
+  version: "18.3.0-www-modern-5fcf1a4b4-20221221",
   rendererPackageName: "react-dom"
 };
 (function(internals) {
@@ -15948,7 +15948,7 @@ var devToolsConfig$jscomp$inline_1812 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "18.3.0-next-2b1fb91a5-20221220"
+  reconcilerVersion: "18.3.0-next-5fcf1a4b4-20221221"
 });
 exports.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = Internals;
 exports.createPortal = function(children, container) {
@@ -16123,7 +16123,7 @@ exports.unstable_flushControlled = function(fn) {
   }
 };
 exports.unstable_runWithPriority = runWithPriority;
-exports.version = "18.3.0-next-2b1fb91a5-20221220";
+exports.version = "18.3.0-next-5fcf1a4b4-20221221";
 
           /* global __REACT_DEVTOOLS_GLOBAL_HOOK__ */
 if (
diff --git a/compiled/facebook-www/ReactDOMServer-dev.classic.js b/compiled/facebook-www/ReactDOMServer-dev.classic.js
@@ -19,7 +19,7 @@ if (__DEV__) {
 var React = require("react");
 var ReactDOM = require("react-dom");
 
-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
 // This refers to a WWW module.
 var warningWWW = require("warning");
diff --git a/compiled/facebook-www/ReactDOMServer-dev.modern.js b/compiled/facebook-www/ReactDOMServer-dev.modern.js
@@ -19,7 +19,7 @@ if (__DEV__) {
 var React = require("react");
 var ReactDOM = require("react-dom");
 
-var ReactVersion = "18.3.0-www-modern-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-modern-5fcf1a4b4-20221221";
 
 // This refers to a WWW module.
 var warningWWW = require("warning");
diff --git a/compiled/facebook-www/ReactDOMServer-prod.classic.js b/compiled/facebook-www/ReactDOMServer-prod.classic.js
@@ -3633,4 +3633,4 @@ exports.renderToString = function(children, options) {
     'The server used "renderToString" which does not support Suspense. If you intended for this Suspense boundary to render the fallback content on the server consider throwing an Error somewhere within the Suspense boundary. If you intended to have the server wait for the suspended component please switch to "renderToReadableStream" which supports Suspense on the server'
   );
 };
-exports.version = "18.3.0-www-classic-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-classic-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/ReactDOMServer-prod.modern.js b/compiled/facebook-www/ReactDOMServer-prod.modern.js
@@ -3546,4 +3546,4 @@ exports.renderToString = function(children, options) {
     'The server used "renderToString" which does not support Suspense. If you intended for this Suspense boundary to render the fallback content on the server consider throwing an Error somewhere within the Suspense boundary. If you intended to have the server wait for the suspended component please switch to "renderToReadableStream" which supports Suspense on the server'
   );
 };
-exports.version = "18.3.0-www-modern-2b1fb91a5-20221220";
+exports.version = "18.3.0-www-modern-5fcf1a4b4-20221221";
diff --git a/compiled/facebook-www/ReactDOMTesting-dev.classic.js b/compiled/facebook-www/ReactDOMTesting-dev.classic.js
@@ -29600,8 +29600,11 @@ function pingSuspendedRoot(root, wakeable, pingedLanes) {
         includesOnlyRetries(workInProgressRootRenderLanes) &&
         now() - globalMostRecentFallbackTime < FALLBACK_THROTTLE_MS)
     ) {
-      // Restart from the root.
-      prepareFreshStack(root, NoLanes);
+      // Force a restart from the root by unwinding the stack. Unless this is
+      // being called from the render phase, because that would cause a crash.
+      if ((executionContext & RenderContext) === NoContext) {
+        prepareFreshStack(root, NoLanes);
+      }
     } else {
       // Even though we can't restart right now, we might get an
       // opportunity later. So we mark this render as having a ping.
@@ -31168,7 +31171,7 @@ function createFiberRoot(
   return root;
 }
 
-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";
+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";
 
 function createPortal(
   children,
diff --git a/compiled/facebook-www/ReactDOMTesting-dev.modern.js b/compiled/facebook-www/ReactDOMTesting-dev.modern.js
diff --git a/compiled/facebook-www/ReactDOMTesting-prod.classic.js b/compiled/facebook-www/ReactDOMTesting-prod.classic.js
diff --git a/compiled/facebook-www/ReactDOMTesting-prod.modern.js b/compiled/facebook-www/ReactDOMTesting-prod.modern.js
diff --git a/compiled/facebook-www/ReactTestRenderer-dev.classic.js b/compiled/facebook-www/ReactTestRenderer-dev.classic.js
diff --git a/compiled/facebook-www/ReactTestRenderer-dev.modern.js b/compiled/facebook-www/ReactTestRenderer-dev.modern.js

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-2b1fb91a55deb9b7b60452cb57184c2f182a42fd`
	`1`	`+5fcf1a4b4c2150a1b9fe0de0144a82a053c63966`
Original file line number	Diff line number	Diff line change
`@@ -27,7 +27,7 @@ if (`
`27`	`27`	`}`
`28`	`28`	`"use strict";`
`29`	`29`
`30`		`-var ReactVersion = "18.3.0-www-classic-2b1fb91a5-20221220";`
	`30`	`+var ReactVersion = "18.3.0-www-classic-5fcf1a4b4-20221221";`
`31`	`31`
`32`	`32`	`// ATTENTION`
`33`	`33`	`// When adding new symbols to this file,`