[ERROR:flutter/shell/platform/windows/flutter_windows_view.cc(603)] Reached unreachable code.

[TENX-S]

Steps to reproduce

1. flutter create --platforms=windows demo4
2. flutter run -d windows
3. resizing the window.
4. program crashed

Expected results

program not crashed.

Actual results

program crashed

Code sample

Just use flutter default example

Screenshots or Video

bug.mp4

Logs

flutter run -d windows
Launching lib\main.dart on Windows in debug mode...
Building Windows application...                                     5.4s
✓  Built build\windows\x64\runner\Debug\demo4.exe.
Syncing files to device Windows...                                  33ms

Flutter run key commands.
r Hot reload. 🔥🔥🔥
R Hot restart.
h List all available interactive commands.
d Detach (terminate "flutter run" but leave application running).
c Clear the screen
q Quit (terminate the application on the device).

A Dart VM Service on Windows is available at: http://127.0.0.1:4634/j4gJP0JqOVs=/
The Flutter DevTools debugger and profiler on Windows is available at:
http://127.0.0.1:9100?uri=http://127.0.0.1:4634/j4gJP0JqOVs=/
[ERROR:flutter/shell/platform/windows/flutter_windows_view.cc(603)] Reached unreachable code.
Lost connection to device.

Flutter Doctor output

Doctor output

[✓] Flutter (Channel master, 3.19.0-8.0.pre.47, on Microsoft Windows [Version 10.0.22631.3007], locale en-US)
    • Flutter version 3.19.0-8.0.pre.47 on channel master at D:\Programs\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 46bbf4029a (11 hours ago), 2024-01-18 20:09:13 -0500
    • Engine revision 90be25d8aa
    • Dart version 3.4.0 (build 3.4.0-24.0.dev)
    • DevTools version 2.31.0

[✓] Windows Version (Installed version of Windows is version 10 or higher)

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
    • Android SDK at C:\Users\Ares\AppData\Local\Android\sdk
    • Platform android-33, build-tools 33.0.2
    • Java binary at: D:\Programs\JetBrains\Toolbox\Android Studio\jbr\bin\java
    • Java version OpenJDK Runtime Environment (build 17.0.7+0-b2043.56-10550314)
    • All Android licenses accepted.

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

[✓] Visual Studio - develop Windows apps (Visual Studio Enterprise 2022 17.8.4)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Enterprise
    • Visual Studio Enterprise 2022 version 17.8.34408.163
    • Windows 10 SDK version 10.0.22621.0

[✓] Android Studio (version 2023.1)
    • Android Studio at D:\Programs\JetBrains\Toolbox\Android Studio
    • 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 17.0.7+0-b2043.56-10550314)

[✓] IntelliJ IDEA Ultimate Edition (version 2023.3)
    • IntelliJ at D:\Programs\JetBrains\Toolbox\IntelliJ IDEA Ultimate
    • Flutter plugin version 77.0.1
    • Dart plugin version 233.13135.65

[!] Proxy Configuration
    • HTTP_PROXY is set
    ! NO_PROXY is not set

[✓] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22631.3007]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 119.0.6045.124
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 120.0.2210.133

[✓] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

[TENX-S]

Extra info

OS Name             : Microsoft Windows 11 Pro
OS Version          : 10.0.22631 N/A Build 22631

[huycozy]

Thanks for the report. This looks like an OS-specific issue. I checked this on my Windows 10 machine but don't see the issue there. My Windows 11 machine is not available currently, I will verify this issue on it as soon as possible.

---

Update: I can reproduce this issue on Windows 11 machine. The issue only appears on master channel but not on stable and beta channels.

Tailed log from `flutter run -v`

[  +43 ms] Connected to _flutterView/0x252536b7a30.
[  +15 ms] Flutter run key commands.
[   +9 ms] r Hot reload.
[   +6 ms] R Hot restart.
[   +3 ms] h List all available interactive commands.
[  +13 ms] d Detach (terminate "flutter run" but leave application running).
[   +8 ms] c Clear the screen
[   +4 ms] q Quit (terminate the application on the device).
[  +18 ms] A Dart VM Service on Windows is available at: http://127.0.0.1:50257/CB6bSUbeHg4=/
[ +799 ms] The Flutter DevTools debugger and profiler on Windows is available at: http://127.0.0.1:9100?uri=http://127.0.0.1:50257/CB6bSUbeHg4=/
[+75012 ms] [ERROR:flutter/shell/platform/windows/flutter_windows_view.cc(603)] Reached unreachable code.
[+5059 ms] Service protocol connection closed.
[   +9 ms] Lost connection to device.
[   +6 ms] DevFS: Deleting filesystem on the device (file:///C:/Users/huynq/AppData/Local/Temp/repro_stable35f2e6b8/repro_stable/)
[ +301 ms] Ignored error while cleaning up DevFS: TimeoutException after 0:00:00.250000: Future not completed

[  +40 ms] "flutter run" took 143,165ms.
[  +17 ms] Running 1 shutdown hook
[  +22 ms] Shutdown hooks complete
[  +20 ms] exiting with code 0

flutter doctor -v (stable, beta and master)

[!] Flutter (Channel stable, 3.16.8, on Microsoft Windows [Version 10.0.22000.2538], locale en-US)
    • Flutter version 3.16.8 on channel stable at C:\WORKING\SDK\flutter
    ! Warning: `flutter` on your path resolves to C:\Aliases\flutter.bat, which is not inside your current Flutter SDK checkout at C:\WORKING\SDK\flutter. Consider adding
      C:\WORKING\SDK\flutter\bin to the front of your path.
    ! The dart binary is not on your path. Consider adding C:\WORKING\SDK\flutter\bin to your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 67457e669f (5 days ago), 2024-01-16 16:22:29 -0800
    • Engine revision 6e2ea58a5c
    • Dart version 3.2.5
    • DevTools version 2.28.5
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[√] Windows Version (Installed version of Windows is version 10 or higher)

[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


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

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.6.5)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.6.33829.357
    • Windows 10 SDK version 10.0.22000.0

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).

[√] VS Code (version 1.85.2)
    • VS Code at C:\Users\huynq\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.80.0

[√] Connected device (2 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22000.2538]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 120.0.6099.217

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 3 categories.

[!] Flutter (Channel master, 3.19.0-9.0.pre.50, on Microsoft Windows [Version 10.0.22000.2538], locale en-US)
    • Flutter version 3.19.0-9.0.pre.50 on channel master at C:\WORKING\SDK\flutter_master
    ! Warning: `flutter` on your path resolves to C:\Aliases\flutter.bat, which is not inside your current Flutter SDK checkout at C:\WORKING\SDK\flutter_master. Consider
      adding C:\WORKING\SDK\flutter_master\bin to the front of your path.
    ! The dart binary is not on your path. Consider adding C:\WORKING\SDK\flutter_master\bin to your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5dea6b994e (13 hours ago), 2024-01-21 12:01:23 -0500
    • Engine revision a7b207d5a1
    • Dart version 3.4.0 (build 3.4.0-52.0.dev)
    • DevTools version 2.31.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[√] Windows Version (Installed version of Windows is version 10 or higher)

[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


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

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.6.5)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.6.33829.357
    • Windows 10 SDK version 10.0.22000.0

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).

[√] VS Code (version 1.85.2)
    • VS Code at C:\Users\huynq\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.80.0

[√] Connected device (2 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22000.2538]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 120.0.6099.217

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 3 categories.

[!] Flutter (Channel beta, 3.19.0-0.2.pre, on Microsoft Windows [Version 10.0.22000.2538], locale en-US)
    • Flutter version 3.19.0-0.2.pre on channel beta at C:\WORKING\SDK\flutter
    ! Warning: `flutter` on your path resolves to C:\Aliases\flutter.bat, which is not inside your current Flutter SDK checkout at C:\WORKING\SDK\flutter. Consider adding
      C:\WORKING\SDK\flutter\bin to the front of your path.
    ! The dart binary is not on your path. Consider adding C:\WORKING\SDK\flutter\bin to your path.
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision c1df7d07ac (4 days ago), 2024-01-17 15:42:07 -0800
    • Engine revision 4f18bb4dcb
    • Dart version 3.3.0 (build 3.3.0-279.0.dev)
    • DevTools version 2.31.0
    • If those were intentional, you can disregard the above warnings; however it is recommended to use "git" directly to perform update checks and upgrades.

[√] Windows Version (Installed version of Windows is version 10 or higher)

[X] Android toolchain - develop for Android devices
    X Unable to locate Android SDK.
      Install Android Studio from: https://developer.android.com/studio/index.html
      On first launch it will assist you in installing the Android SDK components.
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).
      If the Android SDK has been installed to a custom location, please use
      `flutter config --android-sdk` to update to that location.


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

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.6.5)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.6.33829.357
    • Windows 10 SDK version 10.0.22000.0

[!] Android Studio (not installed)
    • Android Studio not found; download from https://developer.android.com/studio/index.html
      (or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions).

[√] VS Code (version 1.85.2)
    • VS Code at C:\Users\huynq\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.80.0

[√] Connected device (2 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22000.2538]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 120.0.6099.217

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 3 categories.

[loic-sharma]

Thanks for reporting this! I was able to reproduce this by resizing the window nonstop until the app crashes. The root cause is flutter/engine#49872, it incorrectly asserts a code path is unreachable.