Invalid argument: Maximum call stack size exceeded, when using mixin on web

[anandsubbu007]

Restarted application in 6,545ms.

�[38;5;248m════════ Exception caught by widgets library ═══════════════════════════════════�[39;49m
�[38;5;244mThe following JSRangeError was thrown building LoginPage$(dirty, dependencies: [_InheritedProviderScope<DataUser>], state: _LoginPageState#edd0e):�[39;49m
Invalid argument: Maximum call stack size exceeded

�[38;5;244mThe relevant error-causing widget was�[39;49m
    �[38;5;248mLoginPage$�[39;49m 
 lib\main.dart
�[38;5;244mWhen the exception was thrown, this was the stack�[39;49m
�[38;5;244mpackages/website/Models/User_model.dart 10:10                                                                                  get name�[39;49m
�[38;5;244mpackages/website/Models/User_model.dart 87:29                                                                                  toString�[39;49m
�[38;5;244mC:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 710:40  str�[39;49m
�[38;5;244mpackages/website/Models/User_model.dart 87:505                                                                                 toString�[39;49m
�[38;5;244mC:/b/s/w/ir/cache/builder/src/out/host_debug/dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/operations.dart 710:40  str�[39;49m
�[38;5;244m...�[39;49m
�[38;5;248m════════════════════════════════════════════════════════════════════════════════�[39;49m

$ flutter doctor -v
[√] Flutter (Channel dev, 1.22.0-1.0.pre, on Microsoft Windows [Version 10.0.19041.508], locale en-IN)
    • Flutter version 1.22.0-1.0.pre at C:\Flutter Components\Flutter
    • Framework revision ce40de69b7 (4 weeks ago), 2020-08-20 07:31:50 -0700
    • Engine revision 81027ab0cc
    • Dart version 2.10.0 (build 2.10.0-45.0.dev)


[√] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at C:\Users\anand\AppData\Local\Android\Sdk
    • Platform android-29, build-tools 29.0.3
    • ANDROID_HOME = C:\Users\anand\AppData\Local\Android\Sdk
    • Java binary at: C:\Flutter Components\Android Studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.6)
    • Android Studio at C:\Flutter Components\Android Studio
    • Flutter plugin version 48.1.1
    • Dart plugin version 192.8052
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b04)

[√] VS Code (version 1.49.1)
    • VS Code at C:\Users\anand\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.14.1

[√] Connected device (3 available)
    • Web Server (web) • web-server • web-javascript • Flutter Tools
    • Chrome (web)     • chrome     • web-javascript • Google Chrome 85.0.4183.102
    • Edge (web)       • edge       • web-javascript • Microsoft Edge 85.0.564.51

• No issues found!

[TahaTesser]

Hi @anandsubbu007
Can you please provide flutter run --verbose logs, and a minimal complete reproducible code sample
Thank you

[anandsubbu007]

i resolved this issue. this cause due to opening hive box soo frequently.

[GyuriMajercsik]

It's happening for me as well and only on dev. I'm still figuring out why...

[szotp]

Same issue here. I'm not using Hive nor Block.

[vanlooverenkoen]

I am having this problem as well. But only on web. I think it has something to do with custom mixins looking like:

import 'package:flutter/material.dart';

abstract class SuccessNavigator {
  void showMessage(String error);
}

mixin SuccessNavigatorMixin<T extends StatefulWidget> on State<T> implements SuccessNavigator {
  static SuccessNavigatorMixin of(context, {rootNavigator = false, nullOk = false}) {
    final SuccessNavigatorMixin navigator = rootNavigator ? context.findRootAncestorStateOfType<SuccessNavigatorMixin>() : context.findAncestorStateOfType<SuccessNavigatorMixin>();
    assert(() {
      if (navigator == null && !nullOk) {
        throw FlutterError('SuccessNavigatorMixin operation requested with a context that does not include a SuccessNavigatorMixin.\n'
            'The context used to push or pop routes from the SuccessNavigatorMixin must be that of a '
            'widget that is a descendant of a SuccessNavigatorMixin widget.');
      }
      return true;
    }());
    return navigator;
    return null;
  }

  @override
  void showMessage(String error) {
   // showMessage
  }
}

[GyuriMajercsik]

Now it is reproducible on beta channel as well (Flutter 1.23.0-18.1.pre). This is pretty annoying since you cannot hot restart during development.

[vanlooverenkoen]

@TahaTesser can you reopen this issue?

[GyuriMajercsik]

I managed to reproduce this in a simple project.

Indeed has something to do with mixins ( at least in my tests )

Reproducible with the mixin in a separate file

main.dart

import 'package:flutter/material.dart';

import 'after_layout.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Web issue',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: HotReloadIssue(),
    );
  }
}

class HotReloadIssue extends StatefulWidget {
  @override
  _HotReloadIssueState createState() => _HotReloadIssueState();
}

class _HotReloadIssueState extends State<HotReloadIssue> with AfterLayoutMixin {
  @override
  Widget build(BuildContext context) {
    // print('building');  // TODO uncomment this and hot restart
    return Scaffold(
      body: Center(
        child: Container(
          decoration: ShapeDecoration(
            shape: CircleBorder(
              side: BorderSide(),
            ),
          ),
          child: Container(
            width: 144,
            height: 144,
            padding: EdgeInsets.all(8),
            child: Center(
              child: Text(
                'Flutter is awesome.',
                textAlign: TextAlign.center,
                maxLines: 5,
                overflow: TextOverflow.fade,
              ),
            ),
          ),
        ),
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {
  }
}

after_layout.dart

import 'package:flutter/widgets.dart';

mixin AfterLayoutMixin<T extends StatefulWidget> on State<T> {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance
        .addPostFrameCallback((_) => afterFirstLayout(context));
  }

  void afterFirstLayout(BuildContext context);
}

Cannot reproduce with mixin inside in the main file

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Web issue',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: HotReloadIssue(),
    );
  }
}

class HotReloadIssue extends StatefulWidget {
  @override
  _HotReloadIssueState createState() => _HotReloadIssueState();
}

class _HotReloadIssueState extends State<HotReloadIssue> with AfterLayoutMixin {
  @override
  Widget build(BuildContext context) {
    // print('building');  // TODO uncomment this and hot restart
    return Scaffold(
      body: Center(
        child: Container(
          decoration: ShapeDecoration(
            shape: CircleBorder(
              side: BorderSide(),
            ),
          ),
          child: Container(
            width: 144,
            height: 144,
            padding: EdgeInsets.all(8),
            child: Center(
              child: Text(
                'Flutter is awesome.',
                textAlign: TextAlign.center,
                maxLines: 5,
                overflow: TextOverflow.fade,
              ),
            ),
          ),
        ),
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {
  }
}

mixin AfterLayoutMixin<T extends StatefulWidget> on State<T> {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance
        .addPostFrameCallback((_) => afterFirstLayout(context));
  }

  void afterFirstLayout(BuildContext context);
}

[dgadduci]

I have the same problem since I update in beta channel see. 1.23.0-18.1.pre, and it gives me the error when I mixin a state widget

[dgadduci]

I downgraded to version 1.22.1 and it stopped giving the error

[josh-burton]

@TahaTesser can this issue be reopened? It's still a problem and looks like lots of us are running into it.

[josh-burton]

have tested on the latest beta, dev and master channels and all get this error when using the AfterLayout mixin.

[dgadduci]

have tested on the latest beta, dev and master channels and all get this error when using the AfterLayout mixin.

Yes, i have too the error when usign theAfterLayout Mixing in beta but work ok in master

[no-response]

Without additional information, we are unfortunately not sure how to resolve this issue. We are therefore reluctantly going to close this bug for now. Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!
Thanks for your contribution.

[TahaTesser]

Hey everyone!
I tried to reproduce the issue on all the channels on the web.

Note: it reproduces after several runs, it doesn't reproduce initially within a new project or when we do clean
Also, it reproduces sometimes on the home widget with after_layout or sometimes with on route page which has after_layout. Sometimes it works in both situations weirdly creating a false sense of security.

complete code sample w/ after_layout on home

import 'package:after_layout/after_layout.dart';
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Web issue',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: HotReloadIssue(),
    );
  }
}

class HotReloadIssue extends StatefulWidget {
  @override
  _HotReloadIssueState createState() => _HotReloadIssueState();
}

class _HotReloadIssueState extends State<HotReloadIssue>
    with AfterLayoutMixin<HotReloadIssue> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Container(
          decoration: ShapeDecoration(
            shape: CircleBorder(
              side: BorderSide(),
            ),
          ),
          child: Container(
            width: 144,
            height: 144,
            padding: EdgeInsets.all(8),
            child: Center(
              child: Text(
                'Flutter is awesome.',
                textAlign: TextAlign.center,
                maxLines: 5,
                overflow: TextOverflow.fade,
              ),
            ),
          ),
        ),
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {}
}

complete code sample w/ after_layout on route

import 'package:after_layout/after_layout.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      theme: ThemeData.dark(),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Material App Bar'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go to Second Screen'),
          onPressed: () {
            Navigator.push(
                context, MaterialPageRoute(builder: (_) => Second()));
          },
        ),
      ),
    );
  }
}

class Second extends StatefulWidget {
  @override
  _SecondState createState() => _SecondState();
}

class _SecondState extends State<Second> with AfterLayoutMixin<Second> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Material App Bar'),
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {}
}

complete code sample with second class

import 'package:flutter/material.dart';
import 'package:master_flutter/second.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Material App',
      theme: ThemeData.dark(),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Material App Bar'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Go to Second Screen'),
          onPressed: () {
            Navigator.push(
                context, MaterialPageRoute(builder: (_) => Second()));
          },
        ),
      ),
    );
  }
}

import 'package:after_layout/after_layout.dart';
import 'package:flutter/material.dart';

class Second extends StatefulWidget {
  @override
  _SecondState createState() => _SecondState();
}

class _SecondState extends State<Second> with AfterLayoutMixin<Second> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Material App Bar'),
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {}
}

logs

[        ] [CHROME]:DevTools listening on
ws://127.0.0.1:59151/devtools/browser/e65b76a9-93bf-41b6-b518-9d3e1f6a28b0
[+2618 ms] Debug service listening on ws://127.0.0.1:59167/gkwRzzo4Yq0=

[ +208 ms] Debug service listening on ws://127.0.0.1:59167/gkwRzzo4Yq0=
[   +1 ms] Warning: Flutter's support for web development is not stable yet and
hasn't
[        ] been thoroughly tested in production environments.
[        ] For more information see https://flutter.dev/web
[        ] 🔥  To hot restart changes while running, press "r" or "R".
[   +1 ms] For a more detailed help message, press "h". To quit, press "q".
[+3449 ms] ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY
                    ╞═══════════════════════════════════════════════════════════
[   +3 ms] The following JSRangeError was thrown building Builder:
[        ] Invalid argument: Maximum call stack size exceeded
[        ] The relevant error-causing widget was:
[        ]   MaterialApp

file:///Users/tahatesser/AndroidStudioProjects/master_flutter/lib/main.dart:9:
             12
[        ] When the exception was thrown, this was the stack:
[   +3 ms] packages/master_flutter/second.dart 7:1                      set
[_widget]
[        ] packages/master_flutter/second.dart 7:1                      set
[_widget]
[        ] packages/master_flutter/second.dart 7:1                      set
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[        ] packages/flutter/src/widgets/framework.dart 3380:18
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 6164:14          mount
[        ] packages/flutter/src/widgets/framework.dart 3615:13
inflateWidget
[        ] packages/flutter/src/widgets/framework.dart 3380:18
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 3380:18
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 3380:18
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[        ] packages/flutter/src/widgets/framework.dart 6164:14          mount
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[        ] packages/flutter/src/widgets/framework.dart 3380:18
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[        ] packages/flutter/src/widgets/framework.dart 4879:5           update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 4369:5           rebuild
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 4369:5           rebuild
[        ] packages/flutter/src/widgets/framework.dart 5033:5           update
[        ] packages/flutter/src/widgets/inherited_notifier.dart 181:11  update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 6171:14          update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 4847:11
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[        ] packages/flutter/src/widgets/framework.dart 4369:5           rebuild
[        ] packages/flutter/src/widgets/framework.dart 4879:5           update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 6171:14          update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 6171:14          update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 5033:5           update
[        ] packages/flutter/src/widgets/framework.dart 3367:14
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[        ] packages/flutter/src/widgets/framework.dart 4700:16
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[        ] packages/flutter/src/widgets/framework.dart 4847:11
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[        ] packages/flutter/src/widgets/framework.dart 4369:5           rebuild
[        ] packages/flutter/src/widgets/framework.dart 2777:31
buildScope
[        ] packages/flutter/src/widgets/binding.dart 906:9
drawFrame
[        ] packages/flutter/src/rendering/binding.dart 309:5
           [_handlePersistentFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1117:15
           [_invokeFrameCallback]
[        ] packages/flutter/src/scheduler/binding.dart 1055:9
handleDrawFrame
[        ] packages/flutter/src/scheduler/binding.dart 971:5
[_handleDrawFrame]
[        ] lib/_engine/engine/window.dart 838:13                        _invoke
[        ] lib/_engine/engine/window.dart 373:5
invokeOnDrawFrame
[        ] lib/_engine/engine.dart 238:18                               <fn>
[        ]
════════════════════════════════════════════════════════════════════════════════
           ════════════════════

beta - doctor -v

[✓] Flutter (Channel beta, 1.23.0-18.1.pre, on Mac OS X 10.15.7 19H2 x86_64,
    locale en-GB)
    • Flutter version 1.23.0-18.1.pre at /Users/tahatesser/Code/flutter_beta
    • Framework revision 198df796aa (4 days ago), 2020-10-15 12:04:33 -0700
    • Engine revision 1d12d82d9c
    • Dart version 2.11.0 (build 2.11.0-213.1.beta)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.0.1, Build version 12A7300
    • CocoaPods version 1.10.0.rc.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.50.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.15.1

[✓] Connected device (3 available)
    • iPhone 11 (mobile) • 193EBBC9-CC2A-4477-B8A0-A5F12BB51400 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-0 (simulator)
    • Web Server (web)   • web-server                           • web-javascript
      • Flutter Tools
    • Chrome (web)       • chrome                               • web-javascript
      • Google Chrome 86.0.4240.80

• No issues found!

dev - flutter doctor -v

[✓] Flutter (Channel dev, 1.23.0-18.0.pre, on Mac OS X 10.15.7 19H2 x86_64,
    locale en-GB)
    • Flutter version 1.23.0-18.0.pre at /Users/tahatesser/Code/flutter_dev
    • Framework revision 37ebe3d82a (6 days ago), 2020-10-13 10:52:23 -0700
    • Engine revision 6634406889
    • Dart version 2.11.0 (build 2.11.0-213.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.0.1, Build version 12A7300
    • CocoaPods version 1.10.0.rc.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.50.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.15.1

 
[✓] Connected device (4 available)            
    • iPhone 11 (mobile) • 193EBBC9-CC2A-4477-B8A0-A5F12BB51400 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-0 (simulator)
    • macOS (desktop)    • macos                                • darwin-x64
      • Mac OS X 10.15.7 19H2 x86_64
    • Web Server (web)   • web-server                           • web-javascript
      • Flutter Tools
    • Chrome (web)       • chrome                               • web-javascript
      • Google Chrome 86.0.4240.80

• No issues found!

master - flutter doctor -v

[✓] Flutter (Channel master, 1.23.0-19.0.pre.95, on Mac OS X 10.15.7 19H2
    darwin-x64, locale en-GB)
    • Flutter version 1.23.0-19.0.pre.95 at
      /Users/tahatesser/Code/flutter_master
    • Framework revision a837557634 (28 hours ago), 2020-10-18 06:12:02 -0400
    • Engine revision 499a70f5e2
    • Dart version 2.11.0 (build 2.11.0-234.0.dev)

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tahatesser/Code/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tahatesser/Code/sdk
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.0.1, Build version 12A7300
    • CocoaPods version 1.10.0.rc.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build
      1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.50.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.15.1

[✓] Connected device (4 available)
    • iPhone 11 (mobile) • 193EBBC9-CC2A-4477-B8A0-A5F12BB51400 • ios
      • com.apple.CoreSimulator.SimRuntime.iOS-14-0 (simulator)
    • macOS (desktop)    • macos                                • darwin-x64
      • Mac OS X 10.15.7 19H2 darwin-x64
    • Web Server (web)   • web-server                           • web-javascript
      • Flutter Tools
    • Chrome (web)       • chrome                               • web-javascript
      • Google Chrome 86.0.4240.80

• No issues found!

[DanTup]

I'm seeing this a lot when running DevTools. It seems like whenever I change certain files (possible in lib/src?) and trigger a hot-reload, this happens. Once it's happened, the app is then somewhat broken even after stop/re-run until I flutter clean.

I also found that it disappears if I remove some custom mixins (though I wasn't sure if this was the cause, or it was just triggering some other code to be regenerated).

I can reproduce it completely reliably with the following:

• clone DevTools at d64a7ef6
• open in VS Code
• accept fetching packages
• select Chrome in the device selector
• Press F5 to run the app
• paste in a VM service URI (you can run another Flutter app somewhere to get one) and click Connect
• modify the file packages/devtools_app/lib/src/inspector/diagnostics_node.dart in VS Code (just add a comment to the end of a line) and click Save

The app will reload, and show the error

The info printed int he debug console is:

The location it mentions (initializer.dart:32:24) is the super(key: key) call in a StagtefulWidget's constructor.

[Markzipan]

Some bisecting implicates this change: #66136

This issue isn't present at 2c163e6 but breaks at 689ca09.

The only DDC change here is this one, so I'm doing some local testing to verify this is the issue:
https://dart-review.googlesource.com/c/sdk/+/161760

[Markzipan]

I can confirm that change is responsible for this break. Reverting the mixin logic resolves the issue in my local engine build.

Corresponding commit: dart-lang/sdk@1d34f60

cc: @nshahan can you take a look?

[znjameswu]

Same here. It has been blocking all my development, that I had to revert to older versions.

Edit: For anyone desparate, running an Android debug session before running web seems to be helpful.

[TahaTesser]

@GyuriMajercsik Thanks!
It also reproduces mixin main file if you run the app a few time and update something on the fourth or fifth run but I also tested in second class and it reproduces there as well and added that it's a sample as well #66122 (comment)

[nshahan]

@jensjoha I think we need some help here to narrow down the issue. I'll summarize what we know so far.

• The issue only appears on the web after a hot-restart. The initial load works fine.
• The reproduction needs a mixin applied from another library (cross-module).
• @Markzipan noticed that after a completely cosmetic edit like changing a string literal and performing a hot-restart the JavaScript code that DDC generated has changed more drastically than expected. A new setter named _widget has appeared on the synthetic mixin class that was not there on the initial load.

These issues lead us to suspect the issue might be coming from the frontend_server but I'd like some advice or help confirming that the issue appears in the kernel AST provided to DDC.

Here is a slimmed down repro from the example provided above:

lib/main.dart

import 'package:flutter/material.dart';
import 'after_layout.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Web issue',
      home: HotReloadIssue(),
    );
  }
}

class HotReloadIssue extends StatefulWidget {
  @override
  _HotReloadIssueState createState() => _HotReloadIssueState();
}

class _HotReloadIssueState extends State<HotReloadIssue>
    with AfterLayoutMixin<HotReloadIssue> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Text(
        'Flutter is awesome.',
      ),
    );
  }

  @override
  void afterFirstLayout(BuildContext context) {}
}

lib/after_layout.dart

import 'package:flutter/widgets.dart';

mixin AfterLayoutMixin<T extends StatefulWidget> on State<T> {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance
        .addPostFrameCallback((_) => afterFirstLayout(context));
  }

  void afterFirstLayout(BuildContext context);
}

We are still trying to find a smaller reproduction outside of flutter and will post if we do.

[Markzipan]

@jensjoha I can confirm that this difference is reflected in the dill. Can you confirm if that's an expected pattern after a cosmetic string update? Seems like an abstract member-signature is converted to a forwarding stub.

Diff (left is after hot restart, right is before):

158177a158178
>     abstract member-signature get key() → key::Key*; -> fra2::Widget::key
158182d158182
<     abstract member-signature get key() → key::Key*; -> fra2::Widget::key
158197a158198
>     abstract member-signature get key() → key::Key*; -> fra2::Widget::key
158202d158202
<     abstract member-signature get key() → key::Key*; -> fra2::Widget::key
158214,158215c158214,158231
<     forwarding-stub set _widget(main::HotReloadIssue* _) → void
<       return super.{fra2::State::_widget} = _;
---
>     abstract member-signature method build(fra2::BuildContext* context) → fra2::Widget*; -> fra2::State::build
>     abstract member-signature get _widget() → main::HotReloadIssue*; -> fra2::State::_widget
>     abstract member-signature set _widget(main::HotReloadIssue* _) → void; -> fra2::State::_widget
>     abstract member-signature get _debugLifecycleState() → fra2::_StateLifecycle*; -> fra2::State::_debugLifecycleState
>     abstract member-signature set _debugLifecycleState(fra2::_StateLifecycle* _) → void; -> fra2::State::_debugLifecycleState
>     abstract member-signature get _element() → fra2::StatefulElement*; -> fra2::State::_element
>     abstract member-signature set _element(fra2::StatefulElement* _) → void; -> fra2::State::_element
>     abstract member-signature method _debugTypesAreRight(fra2::Widget* widget) → core::bool*; -> fra2::State::_debugTypesAreRight
>     abstract member-signature get context() → fra2::BuildContext*; -> fra2::State::context
>     abstract member-signature get mounted() → core::bool*; -> fra2::State::mounted
>     abstract member-signature method setState(() →* void fn) → void; -> fra2::State::setState
>     abstract member-signature method debugFillProperties(dia2::DiagnosticPropertiesBuilder* properties) → void; -> fra2::State::debugFillProperties
>     abstract member-signature method toStringShort() → core::String*; -> dia2::Diagnosticable::toStringShort
>     abstract member-signature method toDiagnosticsNode({core::String* name = #C7, dia2::DiagnosticsTreeStyle* style = #C7}) → dia2::DiagnosticsNode*; -> dia2::Diagnosticable::toDiagnosticsNode
>     abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::==
>     abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode
>     abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod
>     abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType
158227,158228d158242
<     forwarding-stub set _widget(main::HotReloadIssue* _) → void
<       return super.{fra2::State::_widget} = _;

[jensjoha]

I can reproduce and have created a "CFE local test" (https://dart-review.googlesource.com/c/sdk/+/168945).

Can you confirm if that's an expected pattern after a cosmetic string update? Seems like an abstract member-signature is converted to a forwarding stub.

Generally it shouldn't. We do (obviously) have bugs in this area though. As I recall @johnniwinther have been working on fixing some of these inconsistencies.

[DanTup]

@jensjoha thanks! I tested on latest Flutter master that includes dart-lang/sdk@c5f478d and no longer see this with my steps above.

[vanlooverenkoen]

This evening I can do some extra tests with my projects. I had 3 projects where this problem was happening. I will let you know what I found.

[vanlooverenkoen]

@DanTup I am not having the max stack size exceeded exception. The issue seems to be resolved. I tested 3 projects no problem

[sanekyy]

Same issue

[vanlooverenkoen]

Same issue

@sanekyy even on the latest master version?

[sanekyy]

@vanlooverenkoen
Confirming that on latest master this issue is not reproduce.

[nshahan]

The fix dart-lang/sdk@c5f478d was part of the dart sdk v2.11.0-254.0.dev and has rolled into flutter master already.

[escamoteur]

when will this arrive in Beta?

[nshahan]

A cherry-pick request to the beta branch has been opened. dart-lang/sdk#44058

[github-actions]

This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.