[impeller]: superellipse crash in the engine on iOS simulator. #176894
Description
Steps to reproduce
- Run the sample code
- After a few iterations, the app crashes
Note: only tried on iOS simulator (iPhone 16/iOS 18.0). Happens on both stable (3.35.3), and master (3.37.0-1.0.pre-420)
Expected results
No crash
Actual results
A crash occurs. Logs seem to indicate something in impeller::DrawCircularArc. Sometimes it crashes on the main thread thread, but the raster thread is always parked at that method.
Here's a sample full error log: https://gist.github.com/kekland/161f4d2c2b19193c4d65c2c9a87291da
Code sample
Screenshots or Video
Screenshots / Video demonstration
Screen.Recording.2025-10-12.at.17.38.58.mov
Logs
Logs
Just launching through flutter run in VSCode.
Flutter Doctor output
Doctor output
[✓] Flutter (Channel master, 3.37.0-1.0.pre-420, on macOS 15.0.1 24A348 darwin-arm64, locale en-US) [2.3s]
• Flutter version 3.37.0-1.0.pre-420 on channel master at /Users/kekland/fvm/versions/master
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision b95ab963a4 (6 days ago), 2025-10-06 03:11:29 -0400
• Engine revision b95ab963a4
• Dart version 3.10.0 (build 3.10.0-285.0.dev)
• DevTools version 2.50.0
• Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop,
enable-android, enable-ios, cli-animations, enable-native-assets, enable-swift-package-manager,
omit-legacy-version-file, enable-lldb-debugging
[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0-rc4) [995ms]
• Android SDK at /Users/kekland/Library/Android/sdk
• Emulator version 35.5.10.0 (build_id 13402964) (CL:N/A)
• Platform android-36, build-tools 35.0.0-rc4
• ANDROID_HOME = /Users/kekland/Library/Android/sdk
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
This is the JDK bundled with the latest Android Studio installation on this machine.
To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
• Java version OpenJDK Runtime Environment (build 21.0.6+-13391695-b895.109)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 16.0) [679ms]
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 16A242d
• CocoaPods version 1.16.2
[✓] Chrome - develop for the web [4ms]
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Connected device (3 available) [6.0s]
• iPhone 16 (mobile) • C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46 • ios •
com.apple.CoreSimulator.SimRuntime.iOS-18-0 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 15.0.1 24A348
darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome
141.0.7390.66
[✓] Network resources [457ms]
• All expected network resources are available.
• No issues found!Metadata
Metadata
Assignees
Labels
Important issues not at the top of the work listCrashes that terminate the processImpeller rendering backend issues and features requestsflutter/engine related. See also e: labels.Found to occur in 3.35Found to occur in 3.37The issue has been confirmed reproducible and is ready to work oniOS applications specificallyIssue is closed as already fixed in a newer versionOwned by Engine teamTriaged by Engine team