core(gather): handle crash if CDP target crashes

cli/test/smokehouse/config/exclusions.js

@@ -26,6 +26,8 @@ const exclusions = {
     'metrics-tricky-tti', 'metrics-tricky-tti-late-fcp', 'screenshot',
     // Disabled because of differences that need further investigation
     'byte-efficiency', 'byte-gzip', 'perf-preload',
+    // Disabled because a renderer crash also breaks devtools frontend
+    'crash',
   ],
 };
 

cli/test/smokehouse/core-tests.js

@@ -7,6 +7,7 @@
 import a11y from './test-definitions/a11y.js';
 import byteEfficiency from './test-definitions/byte-efficiency.js';
 import byteGzip from './test-definitions/byte-gzip.js';
+import crash from './test-definitions/crash.js';
 import cspAllowAll from './test-definitions/csp-allow-all.js';
 import cspBlockAll from './test-definitions/csp-block-all.js';
 import dbw from './test-definitions/dobetterweb.js';
@@ -65,6 +66,7 @@ const smokeTests = [
   a11y,
   byteEfficiency,
   byteGzip,
+  crash,
   cspAllowAll,
   cspBlockAll,
   dbw,

cli/test/smokehouse/test-definitions/crash.js

@@ -0,0 +1,41 @@
+/**
+ * @license
+ * Copyright 2024 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+const config = {
+  extends: 'lighthouse:default',
+  settings: {
+    maxWaitForLoad: 5000,
+    onlyAudits: [
+      'first-contentful-paint',
+    ],
+  },
+};
+
+/**
+ * @type {Smokehouse.ExpectedRunnerResult}
+ */
+const expectations = {
+  lhr: {
+    requestedUrl: 'chrome://crash',
+    finalDisplayedUrl: 'about:blank',
+    runtimeError: {code: 'TARGET_CRASHED'},
+    runWarnings: [
+      'Browser tab has unexpectedly crashed.',
+    ],
+    audits: {
+      'first-contentful-paint': {
+        scoreDisplayMode: 'error',
+        errorMessage: 'Browser tab has unexpectedly crashed.',
+      },
+    },
+  },
+};
+
+export default {
+  id: 'crash',
+  expectations,
+  config,
+};

core/gather/driver.js

@@ -8,6 +8,7 @@ import log from 'lighthouse-logger';
 
 import {ExecutionContext} from './driver/execution-context.js';
 import {TargetManager} from './driver/target-manager.js';
+import {LighthouseError} from '../lib/lh-error.js';
 import {Fetcher} from './fetcher.js';
 import {NetworkMonitor} from './driver/network-monitor.js';
 
@@ -47,6 +48,12 @@ class Driver {
     this._fetcher = undefined;
 
     this.defaultSession = throwingSession;
+
+    // Poor man's Promise.withResolvers()
+    /** @param {Error} _ */
+    let rej = _ => {};
+    const promise = /** @type {Promise<never>} */ (new Promise((_, theRej) => rej = theRej));
+    this.fatalRejection = {promise, rej};
   }
 
   /** @return {LH.Gatherer.Driver['executionContext']} */
@@ -86,11 +93,30 @@ class Driver {
     this._networkMonitor = new NetworkMonitor(this._targetManager);
     await this._networkMonitor.enable();
     this.defaultSession = this._targetManager.rootSession();
+    this.listenForCrashes();
     this._executionContext = new ExecutionContext(this.defaultSession);
     this._fetcher = new Fetcher(this.defaultSession);
     log.timeEnd(status);
   }
 
+  /**
+   * If the target crashes, we can't continue gathering.
+   *
+   * FWIW, if the target unexpectedly detaches (eg the user closed the tab), pptr will
+   * catch that and reject into our this._cdpSession.send, which we'll alrady handle appropriately
+   * @return {void}
+   */
+  listenForCrashes() {
+    this.defaultSession.on('Inspector.targetCrashed', async _ => {
+      log.error('Driver', 'Inspector.targetCrashed');
+      // Manually detach so no more CDP traffic is attempted.
+      // Don't await, else our rejection will be a 'Target closed' protocol error on cross-talk CDP calls.
+      void this.defaultSession.dispose();
+      this.fatalRejection.rej(new LighthouseError(LighthouseError.errors.TARGET_CRASHED));
+    });
+  }
+
+
   /** @return {Promise<void>} */
   async disconnect() {
     if (this.defaultSession === throwingSession) return;

core/gather/driver/navigation.js

@@ -122,7 +122,10 @@ async function gotoURL(driver, requestor, options) {
     throw new Error('Cannot wait for FCP without waiting for page load');
   }
 
-  const waitConditions = await Promise.all(waitConditionPromises);
+  const waitConditions = await Promise.race([
+    driver.fatalRejection.promise,
+    Promise.all(waitConditionPromises),
+  ]);
   const timedOut = waitConditions.some(condition => condition.timedOut);
   const navigationUrls = await networkMonitor.getNavigationUrls();
 

core/gather/driver/prepare.js

@@ -45,7 +45,7 @@ async function enableAsyncStacks(session) {
   await enable();
 
   return async () => {
-    await session.sendCommand('Debugger.disable');
+    await session.sendCommandAndIgnore('Debugger.disable');
     session.off('Debugger.paused', onDebuggerPaused);
     session.off('Page.frameNavigated', onFrameNavigated);
   };

core/gather/driver/target-manager.js

@@ -266,8 +266,9 @@ class TargetManager extends ProtocolEventEmitter {
       cdpSession.off('sessionattached', this._onSessionAttached);
     }
 
-    await this._rootCdpSession.send('Page.disable');
-    await this._rootCdpSession.send('Runtime.disable');
+    // Ignore failures on these in case the tab has crashed.
+    await this._rootCdpSession.send('Page.disable').catch(_ => {});
+    await this._rootCdpSession.send('Runtime.disable').catch(_ => {});
 
     this._enabled = false;
     this._targetIdToTargets = new Map();

core/gather/navigation-runner.js

@@ -92,7 +92,9 @@ async function _navigate(navigationContext) {
     return {requestedUrl, mainDocumentUrl, navigationError: undefined};
   } catch (err) {
     if (!(err instanceof LighthouseError)) throw err;
-    if (err.code !== 'NO_FCP' && err.code !== 'PAGE_HUNG') throw err;
+    if (err.code !== 'NO_FCP' && err.code !== 'PAGE_HUNG' && err.code !== 'TARGET_CRASHED') {
+      throw err;
+    }
     if (typeof requestor !== 'string') throw err;
 
     // TODO: Make the urls optional here so we don't need to throw an error with a callback requestor.

core/gather/session.js

@@ -100,6 +100,7 @@ class ProtocolSession extends CrdpEventEmitter {
     /** @type {NodeJS.Timer|undefined} */
     let timeout;
     const timeoutPromise = new Promise((resolve, reject) => {
+      // Unexpected setTimeout invocation to preserve the error stack. https://github.com/GoogleChrome/lighthouse/issues/13332
       // eslint-disable-next-line max-len
       timeout = setTimeout(reject, timeoutMs, new LighthouseError(LighthouseError.errors.PROTOCOL_TIMEOUT, {
         protocolMethod: method,
@@ -139,7 +140,7 @@ class ProtocolSession extends CrdpEventEmitter {
   async dispose() {
     // @ts-expect-error Puppeteer expects the handler params to be type `unknown`
     this._cdpSession.off('*', this._handleProtocolEvent);
-    await this._cdpSession.detach();
+    await this._cdpSession.detach().catch(e => log.verbose('session', 'detach failed', e.message));
   }
 }
 

core/lib/emulation.js

@@ -128,7 +128,7 @@ function enableNetworkThrottling(session, throttlingSettings) {
  * @return {Promise<void>}
  */
 function clearNetworkThrottling(session) {
-  return session.sendCommand('Network.emulateNetworkConditions', NO_THROTTLING_METRICS);
+  return session.sendCommandAndIgnore('Network.emulateNetworkConditions', NO_THROTTLING_METRICS);
 }
 
 /**
@@ -146,7 +146,7 @@ function enableCPUThrottling(session, throttlingSettings) {
  * @return {Promise<void>}
  */
 function clearCPUThrottling(session) {
-  return session.sendCommand('Emulation.setCPUThrottlingRate', NO_CPU_THROTTLE_METRICS);
+  return session.sendCommandAndIgnore('Emulation.setCPUThrottlingRate', NO_CPU_THROTTLE_METRICS);
 }
 
 export {

core/lib/lh-error.js

@@ -91,6 +91,9 @@ const UIStrings = {
    * @example {Largest Contentful Paint} featureName
    * */
   oldChromeDoesNotSupportFeature: 'This version of Chrome is too old to support \'{featureName}\'. Use a newer version to see full results.',
+
+  /** Error message explaining that the browser tab that Lighthouse is inspecting has crashed. */
+  targetCrashed: 'Browser tab has unexpectedly crashed.',
 };
 
 const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);
@@ -423,6 +426,13 @@ const ERRORS = {
     message: UIStrings.erroredRequiredArtifact,
   },
 
+  /** The page has crashed and will no longer respond to 99% of CDP commmands. */
+  TARGET_CRASHED: {
+    code: 'TARGET_CRASHED',
+    message: UIStrings.targetCrashed,
+    lhrRuntimeError: true,
+  },
+
   // Hey! When adding a new error type, update lighthouse-result.proto too.
   // Only necessary for runtime errors, which come from artifacts or pageLoadErrors.
 };

core/lib/navigation-error.js

@@ -150,6 +150,9 @@ function getPageLoadError(navigationError, context) {
   let finalRecord;
   if (mainRecord) {
     finalRecord = NetworkAnalyzer.resolveRedirects(mainRecord);
+  } else {
+    // We have no network requests to process, use the navError
+    return navigationError;
   }
 
   if (finalRecord?.mimeType === XHTML_MIME_TYPE) {

core/test/gather/mock-driver.js

@@ -158,6 +158,13 @@ function createMockDriver() {
   const context = createMockExecutionContext();
   const targetManager = createMockTargetManager(session);
 
+  // The `fatalRejection`
+  /** @param {Error} _ */
+  let rej = _ => {};
+  const promise = new Promise((_, theRej) => {
+    rej = theRej;
+  });
+
   return {
     _page: page,
     _executionContext: context,
@@ -172,6 +179,8 @@ function createMockDriver() {
       fetchResource: fnAny(),
     },
     networkMonitor: new NetworkMonitor(targetManager.asTargetManager()),
+    listenForCrashes: fnAny(),
+    fatalRejection: {promise, rej},
 
     /** @return {Driver} */
     asDriver() {

core/test/gather/session-test.js

@@ -104,6 +104,7 @@ describe('ProtocolSession', () => {
   describe('.dispose', () => {
     it('should detach from the session', async () => {
       const detach = fnAny();
+      detach.mockResolvedValue(undefined);
       class MockCdpSession extends EventEmitter {
         constructor() {
           super();

proto/lighthouse-result.proto

@@ -61,6 +61,10 @@ enum LighthouseError {
   NOT_HTML = 21;
   // The trace did not contain a ResourceSendRequest event.
   NO_RESOURCE_REQUEST = 22;
+  // Used when any Chrome interstitial error prevents page load.
+  CHROME_INTERSTITIAL_ERROR = 23;
+  // The page has crashed and will no longer respond to 99% of CDP commmands.
+  TARGET_CRASHED = 24;
 }
 
 // The overarching Lighthouse Response object (LHR)

types/gatherer.d.ts

@@ -49,6 +49,8 @@ declare module Gatherer {
       off(event: 'protocolevent', callback: (payload: Protocol.RawEventMessage) => void): void
     };
     networkMonitor: NetworkMonitor;
+    listenForCrashes: (() => void);
+    fatalRejection: {promise: Promise<never>, rej: (reason: Error) => void}
   }
 
   interface Context<TDependencies extends DependencyKey = DefaultDependenciesKey> {