Crash: "Bad state: Future already completed" when hot restarting #74407
Description
Using current master version (5b0f69f), I reliably see a crash when trying to hot reload (on iOS Simulator). I can reproduce from the terminal and using a clean flutter create project.
- Run
flutter create foo && cd foo - Run
flutter run(I'm using iOS Simulator, I'm unsure if that matters) - When the app loads, press
Shift+Rto hot restart - If it doesn't crash, press
Shift+Ragain
It always seems to happen within 1 or 2 restarts for me.
command
flutter run --target lib/main.dart -d F3122E57-B9F0-4AAB-9C88-92EBE7B77289
exception
StateError: Bad state: Future already completed
#0 _AsyncCompleter.complete (dart:async/future_impl.dart:45:31)
#1 ResidentRunner.waitForExtension.<anonymous closure> (package:flutter_tools/src/resident_runner.dart:1425:19)
#2 _rootRunUnary (dart:async/zone.dart:1362:47)
#3 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
#4 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1170:7)
#5 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:341:11)
#6 _DelayedData.perform (dart:async/stream_impl.dart:591:14)
#7 _StreamImplEvents.handleNext (dart:async/stream_impl.dart:706:11)
#8 _PendingEvents.schedule.<anonymous closure> (dart:async/stream_impl.dart:663:7)
#9 _rootRun (dart:async/zone.dart:1346:47)
#10 _CustomZone.run (dart:async/zone.dart:1258:19)
#11 _CustomZone.runGuarded (dart:async/zone.dart:1162:7)
#12 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1202:23)
#13 _rootRun (dart:async/zone.dart:1354:13)
#14 _CustomZone.run (dart:async/zone.dart:1258:19)
#15 _CustomZone.runGuarded (dart:async/zone.dart:1162:7)
#16 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1202:23)
#17 _microtaskLoop (dart:async/schedule_microtask.dart:40:21)
#18 _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)
#19 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:120:13)
#20 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:185:5)
flutter doctor
[✓] Flutter (Channel master, 1.26.0-2.0.pre.451, on macOS 11.1 20C69 darwin-x64, locale en-GB)
• Flutter version 1.26.0-2.0.pre.451 at /Users/danny/Dev/Google/flutter
• Framework revision 5b0f69f961 (2 hours ago), 2021-01-21 07:49:03 -0500
• Engine revision 30bb7452f8
• Dart version 2.12.0 (build 2.12.0-247.0.dev)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
• Android SDK at /Users/danny/Library/Android/sdk
• Platform android-30, build-tools 30.0.3
• 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-b3-6915495)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 12.3, Build version 12C33
• CocoaPods version 1.10.0
[✓] 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-b3-6915495)
[✓] VS Code (version 1.52.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.18.1
[✓] Connected device (3 available)
• iPhone 12 Pro Max (mobile) • F3122E57-B9F0-4AAB-9C88-92EBE7B77289 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-3 (simulator)
• macOS (desktop) • macos • darwin-x64 • macOS 11.1 20C69 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 87.0.4280.141
• No issues found!