[impeller]: superellipse crash in the engine on iOS simulator.

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

https://gist.github.com/kekland/5897c4c08bb9561c849fff912e15dbba

Screenshots or Video

Screenshots / Video demonstration

Screen.Recording.2025-10-12.at.17.38.58.mov

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!

crash log


-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Incident Identifier: E7DAC5B0-D56D-44B7-B974-BD7353A3AFC5
CrashReporter Key:   E9BE71AD-0211-4477-09AF-D3D79A912A42
Hardware Model:      Mac15,6
Process:             Runner [77926]
Path:                /Users/USER/Library/Developer/CoreSimulator/Devices/C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46/data/Containers/Bundle/Application/F09ED67F-6720-4ED6-B13D-23ACEC627317/Runner.app/Runner
Identifier:          com.example.flutterSuperellipseCrash
Version:             1.0.0 (1)
Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd_sim [2609]
Coalition:           com.apple.CoreSimulator.SimDevice.C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46 [1098]
Responsible Process: SimulatorTrampoline [2539]

Date/Time:           2025-10-12 17:37:30.7867 +0500
Launch Time:         2025-10-12 17:37:28.6327 +0500
OS Version:          macOS 15.0.1 (24A348)
Release Type:        User
Report Version:      104

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0xffc00000ffc00008 -> 0xffff8000ffc00008 (possible pointer authentication failure)
Exception Codes: 0x0000000000000001, 0xffc00000ffc00008
VM Region Info: 0xffff8000ffc00008 is not in any region.  
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      UNUSED SPACE AT END
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [77926]

Triggered by Thread:  0

Kernel Triage:
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter
VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter


Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   Flutter                       	       0x103a16820 dart::Zone::~Zone() + 72
1   Flutter                       	       0x103a05014 dart::Thread::ExitApiScope() + 96
2   Flutter                       	       0x103bfdcdc Dart_ExitScope + 216
3   Flutter                       	       0x1037fb03c tonic::DartState::Scope::~Scope() + 28
4   Flutter                       	       0x1038289e8 flutter::PlatformConfiguration::BeginFrame(fml::TimePoint, unsigned long long) + 536
5   Flutter                       	       0x103865fd8 flutter::RuntimeController::BeginFrame(fml::TimePoint, unsigned long long) + 68
6   Flutter                       	       0x1037ca7c8 flutter::Animator::BeginFrame(std::_fl::unique_ptr<flutter::FrameTimingsRecorder, std::_fl::default_delete<flutter::FrameTimingsRecorder>>) + 496
7   Flutter                       	       0x1037cda94 std::_fl::__function::__func<flutter::Animator::AwaitVSync()::$_0, std::_fl::allocator<flutter::Animator::AwaitVSync()::$_0>, void (std::_fl::unique_ptr<flutter::FrameTimingsRecorder, std::_fl::default_delete<flutter::FrameTimingsRecorder>>)>::operator()(std::_fl::unique_ptr<flutter::FrameTimingsRecorder, std::_fl::default_delete<flutter::FrameTimingsRecorder>>&&) + 76
8   Flutter                       	       0x1037f6144 std::_fl::__function::__func<flutter::VsyncWaiter::FireCallback(fml::TimePoint, fml::TimePoint, bool)::$_0, std::_fl::allocator<flutter::VsyncWaiter::FireCallback(fml::TimePoint, fml::TimePoint, bool)::$_0>, void ()>::operator()() + 120
9   Flutter                       	       0x1033e03e8 fml::MessageLoopImpl::FlushTasks(fml::FlushType) + 152
10  Flutter                       	       0x1033e7710 fml::MessageLoopDarwin::OnTimerFire(__CFRunLoopTimer*, fml::MessageLoopDarwin*) + 32
11  CoreFoundation                	       0x18041ba2c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
12  CoreFoundation                	       0x18041b6e8 __CFRunLoopDoTimer + 956
13  CoreFoundation                	       0x18041ad7c __CFRunLoopDoTimers + 284
14  CoreFoundation                	       0x1804154a8 __CFRunLoopRun + 1804
15  CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
16  GraphicsServices              	       0x190183b10 GSEventRunModal + 160
17  UIKitCore                     	       0x185aa2b40 -[UIApplication _run] + 796
18  UIKitCore                     	       0x185aa6d38 UIApplicationMain + 124
19  UIKitCore                     	       0x184e9a184 0x184c81000 + 2199940
20  Runner.debug.dylib            	       0x100a773dc static UIApplicationDelegate.main() + 120
21  Runner.debug.dylib            	       0x100a77354 static AppDelegate.$main() + 44
22  Runner.debug.dylib            	       0x100a77458 __debug_main_executable_dylib_entry_point + 28 (AppDelegate.swift:5)
23  dyld_sim                      	       0x100bf1410 start_sim + 20
24  dyld                          	       0x100932274 start + 2840

Thread 1:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 2:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 4:: com.apple.uikit.eventfetch-thread
0   libsystem_kernel.dylib        	       0x100cb9290 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x100cca6c4 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x100cc13f4 mach_msg_overwrite + 536
3   libsystem_kernel.dylib        	       0x100cb95cc mach_msg + 20
4   CoreFoundation                	       0x18041ab60 __CFRunLoopServiceMachPort + 156
5   CoreFoundation                	       0x180415224 __CFRunLoopRun + 1160
6   CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
7   Foundation                    	       0x180f2af24 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 208
8   Foundation                    	       0x180f2b144 -[NSRunLoop(NSRunLoop) runUntilDate:] + 60
9   UIKitCore                     	       0x185b4ec88 -[UIEventFetcher threadMain] + 404
10  Foundation                    	       0x180f51d6c __NSThread__start__ + 720
11  libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
12  libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 5:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 6:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 7:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 8:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 9:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 10:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 11:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 12:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 13:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 14:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 15:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 16:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 17:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 18:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 19:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 20:
0   libsystem_pthread.dylib       	       0x100b1292c start_wqthread + 0

Thread 21:: io.flutter.1.raster
0   libsystem_m.dylib             	       0x1ca9e6de4 __sincosf_stret + 24
1   Flutter                       	       0x1037a6e1c impeller::(anonymous namespace)::DrawCircularArc(impeller::TPoint<float>*, impeller::TPoint<float>, float, bool, impeller::Matrix const&) + 156
2   Flutter                       	       0x1037a6acc impeller::(anonymous namespace)::DrawOctantSquareLikeSquircle(impeller::TPoint<float>*, impeller::RoundSuperellipseParam::Octant const&, bool, impeller::Matrix const&) + 268
3   Flutter                       	       0x1037a674c impeller::(anonymous namespace)::DrawQuadrant(impeller::TPoint<float>*, impeller::RoundSuperellipseParam::Quadrant const&) + 108
4   Flutter                       	       0x1037a64ac impeller::RoundSuperellipseGeometry::GetPositionBuffer(impeller::ContentContext const&, impeller::Entity const&, impeller::RenderPass&) const + 272
5   Flutter                       	       0x103798264 bool impeller::ColorSourceContents::DrawGeometry<impeller::SolidFillVertexShader>(impeller::Contents const*, impeller::Geometry const*, impeller::ContentContext const&, impeller::Entity const&, impeller::RenderPass&, std::_fl::function<impeller::raw_ptr<impeller::Pipeline<impeller::PipelineDescriptor>> (impeller::ContentContextOptions)> const&, impeller::SolidFillVertexShader::FrameInfo, std::_fl::function<bool (impeller::RenderPass&)> const&, bool, std::_fl::function<impeller::GeometryResult (impeller::ContentContext const&, impeller::Entity const&, impeller::RenderPass&, impeller::Geometry const*)> const&) + 1416
6   Flutter                       	       0x103797abc impeller::SolidColorContents::Render(impeller::ContentContext const&, impeller::Entity const&, impeller::RenderPass&) const + 320
7   Flutter                       	       0x1037a1538 impeller::Entity::Render(impeller::ContentContext const&, impeller::RenderPass&) const + 128
8   Flutter                       	       0x103734c6c impeller::Canvas::AddRenderEntityToCurrentPass(impeller::Entity&, bool) + 1672
9   Flutter                       	       0x103734030 impeller::Canvas::AddRenderEntityWithFiltersToCurrentPass(impeller::Entity&, impeller::Geometry const*, impeller::Paint const&, bool) + 1348
10  Flutter                       	       0x103737540 impeller::Canvas::DrawRoundSuperellipse(impeller::RoundSuperellipse const&, impeller::Paint const&) + 284
11  Flutter                       	       0x1034549dc flutter::DisplayList::Dispatch(flutter::DlOpReceiver&, impeller::TRect<float> const&) const + 180
12  Flutter                       	       0x10373fc84 impeller::DlDispatcherBase::drawDisplayList(sk_sp<flutter::DisplayList>, float) + 556
13  Flutter                       	       0x103454fcc flutter::DrawDisplayListOp::dispatch(flutter::DlOpReceiver&) const + 64
14  Flutter                       	       0x103454998 flutter::DisplayList::Dispatch(flutter::DlOpReceiver&, impeller::TRect<float> const&) const + 112
15  Flutter                       	       0x103741770 impeller::RenderToTarget(impeller::ContentContext&, impeller::RenderTarget, sk_sp<flutter::DisplayList> const&, impeller::TRect<float>, bool, bool) + 280
16  Flutter                       	       0x103879634 std::_fl::__function::__func<fml::internal::CopyableLambda<flutter::GPUSurfaceMetalImpeller::AcquireFrameFromCAMetalLayer(impeller::TSize<int> const&)::$_0>, std::_fl::allocator<fml::internal::CopyableLambda<flutter::GPUSurfaceMetalImpeller::AcquireFrameFromCAMetalLayer(impeller::TSize<int> const&)::$_0>>, bool (flutter::SurfaceFrame&, flutter::DlCanvas*)>::operator()(flutter::SurfaceFrame&, flutter::DlCanvas*&&) + 944
17  Flutter                       	       0x103674ef0 flutter::SurfaceFrame::Encode() + 100
18  Flutter                       	       0x103674f6c flutter::SurfaceFrame::Submit() + 76
19  Flutter                       	       0x10336f91c -[FlutterPlatformViewsController submitFrame:withIosContext:] + 640
20  Flutter                       	       0x1033b200c flutter::IOSExternalViewEmbedder::SubmitFlutterView(long long, GrDirectContext*, std::_fl::shared_ptr<impeller::AiksContext> const&, std::_fl::unique_ptr<flutter::SurfaceFrame, std::_fl::default_delete<flutter::SurfaceFrame>>) + 164
21  Flutter                       	       0x1037d50bc flutter::Rasterizer::DrawToSurfaceUnsafe(long long, flutter::LayerTree&, float, std::_fl::optional<fml::TimePoint>) + 960
22  Flutter                       	       0x1037d4b28 flutter::Rasterizer::DrawToSurfacesUnsafe(flutter::FrameTimingsRecorder&, std::_fl::vector<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>, std::_fl::allocator<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>>>) + 440
23  Flutter                       	       0x1037d777c std::_fl::__function::__func<flutter::Rasterizer::DrawToSurfaces(flutter::FrameTimingsRecorder&, std::_fl::vector<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>, std::_fl::allocator<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>>>)::$_1, std::_fl::allocator<flutter::Rasterizer::DrawToSurfaces(flutter::FrameTimingsRecorder&, std::_fl::vector<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>, std::_fl::allocator<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>>>)::$_1>, void ()>::operator()() + 68
24  Flutter                       	       0x1033e325c fml::SyncSwitch::Execute(fml::SyncSwitch::Handlers const&) const + 68
25  Flutter                       	       0x1037d3bb4 flutter::Rasterizer::DrawToSurfaces(flutter::FrameTimingsRecorder&, std::_fl::vector<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>, std::_fl::allocator<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>>>) + 392
26  Flutter                       	       0x1037d46b8 flutter::Rasterizer::DoDraw(std::_fl::unique_ptr<flutter::FrameTimingsRecorder, std::_fl::default_delete<flutter::FrameTimingsRecorder>>, std::_fl::vector<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>, std::_fl::allocator<std::_fl::unique_ptr<flutter::LayerTreeTask, std::_fl::default_delete<flutter::LayerTreeTask>>>>) + 168
27  Flutter                       	       0x1037d6aa0 std::_fl::__function::__func<flutter::Rasterizer::Draw(std::_fl::shared_ptr<flutter::Pipeline<flutter::FrameItem>> const&)::$_0, std::_fl::allocator<flutter::Rasterizer::Draw(std::_fl::shared_ptr<flutter::Pipeline<flutter::FrameItem>> const&)::$_0>, void (std::_fl::unique_ptr<flutter::FrameItem, std::_fl::default_delete<flutter::FrameItem>>)>::operator()(std::_fl::unique_ptr<flutter::FrameItem, std::_fl::default_delete<flutter::FrameItem>>&&) + 88
28  Flutter                       	       0x1037d4108 flutter::Pipeline<flutter::FrameItem>::Consume(std::_fl::function<void (std::_fl::unique_ptr<flutter::FrameItem, std::_fl::default_delete<flutter::FrameItem>>)> const&) + 144
29  Flutter                       	       0x1037d3dd4 flutter::Rasterizer::Draw(std::_fl::shared_ptr<flutter::Pipeline<flutter::FrameItem>> const&) + 148
30  Flutter                       	       0x1037eb988 std::_fl::__function::__func<fml::internal::CopyableLambda<flutter::Shell::OnAnimatorDraw(std::_fl::shared_ptr<flutter::Pipeline<flutter::FrameItem>>)::$_0>, std::_fl::allocator<fml::internal::CopyableLambda<flutter::Shell::OnAnimatorDraw(std::_fl::shared_ptr<flutter::Pipeline<flutter::FrameItem>>)::$_0>>, void ()>::operator()() + 88
31  Flutter                       	       0x1033e03e8 fml::MessageLoopImpl::FlushTasks(fml::FlushType) + 152
32  Flutter                       	       0x1033e7710 fml::MessageLoopDarwin::OnTimerFire(__CFRunLoopTimer*, fml::MessageLoopDarwin*) + 32
33  CoreFoundation                	       0x18041ba2c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28
34  CoreFoundation                	       0x18041b6e8 __CFRunLoopDoTimer + 956
35  CoreFoundation                	       0x18041ad7c __CFRunLoopDoTimers + 284
36  CoreFoundation                	       0x1804154a8 __CFRunLoopRun + 1804
37  CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
38  Flutter                       	       0x1033e7848 fml::MessageLoopDarwin::Run() + 92
39  Flutter                       	       0x1033e0310 fml::MessageLoopImpl::DoRun() + 44
40  Flutter                       	       0x1033e5ef0 std::_fl::__function::__func<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0, std::_fl::allocator<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0>, void ()>::operator()() + 184
41  Flutter                       	       0x1033e5bb4 fml::ThreadHandle::ThreadHandle(std::_fl::function<void ()>&&)::$_0::__invoke(void*) + 36
42  libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
43  libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 22:: io.flutter.1.io
0   libsystem_kernel.dylib        	       0x100cb9290 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x100cca6c4 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x100cc13f4 mach_msg_overwrite + 536
3   libsystem_kernel.dylib        	       0x100cb95cc mach_msg + 20
4   CoreFoundation                	       0x18041ab60 __CFRunLoopServiceMachPort + 156
5   CoreFoundation                	       0x180415224 __CFRunLoopRun + 1160
6   CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
7   Flutter                       	       0x1033e7848 fml::MessageLoopDarwin::Run() + 92
8   Flutter                       	       0x1033e0310 fml::MessageLoopImpl::DoRun() + 44
9   Flutter                       	       0x1033e5ef0 std::_fl::__function::__func<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0, std::_fl::allocator<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0>, void ()>::operator()() + 184
10  Flutter                       	       0x1033e5bb4 fml::ThreadHandle::ThreadHandle(std::_fl::function<void ()>&&)::$_0::__invoke(void*) + 36
11  libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
12  libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 23:: io.flutter.1.profiler
0   libsystem_kernel.dylib        	       0x100cb9290 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x100cca6c4 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x100cc13f4 mach_msg_overwrite + 536
3   libsystem_kernel.dylib        	       0x100cb95cc mach_msg + 20
4   CoreFoundation                	       0x18041ab60 __CFRunLoopServiceMachPort + 156
5   CoreFoundation                	       0x180415224 __CFRunLoopRun + 1160
6   CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
7   Flutter                       	       0x1033e7848 fml::MessageLoopDarwin::Run() + 92
8   Flutter                       	       0x1033e0310 fml::MessageLoopImpl::DoRun() + 44
9   Flutter                       	       0x1033e5ef0 std::_fl::__function::__func<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0, std::_fl::allocator<fml::Thread::Thread(std::_fl::function<void (fml::Thread::ThreadConfig const&)> const&, fml::Thread::ThreadConfig const&)::$_0>, void ()>::operator()() + 184
10  Flutter                       	       0x1033e5bb4 fml::ThreadHandle::ThreadHandle(std::_fl::function<void ()>&&)::$_0::__invoke(void*) + 36
11  libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
12  libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 24:: io.worker.1
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17c98 _pthread_cond_wait + 1192
2   Flutter                       	       0x1033b8798 std::_fl::condition_variable::wait(std::_fl::unique_lock<std::_fl::mutex>&) + 24
3   Flutter                       	       0x1033dcab4 fml::ConcurrentMessageLoop::WorkerMain() + 140
4   Flutter                       	       0x1033dd15c void* std::_fl::__thread_proxy[abi:nn210000]<std::_fl::tuple<std::_fl::unique_ptr<std::_fl::__thread_struct, std::_fl::default_delete<std::_fl::__thread_struct>>, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0>>(void*) + 192
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 25:: io.worker.2
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17c98 _pthread_cond_wait + 1192
2   Flutter                       	       0x1033b8798 std::_fl::condition_variable::wait(std::_fl::unique_lock<std::_fl::mutex>&) + 24
3   Flutter                       	       0x1033dcab4 fml::ConcurrentMessageLoop::WorkerMain() + 140
4   Flutter                       	       0x1033dd15c void* std::_fl::__thread_proxy[abi:nn210000]<std::_fl::tuple<std::_fl::unique_ptr<std::_fl::__thread_struct, std::_fl::default_delete<std::_fl::__thread_struct>>, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0>>(void*) + 192
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 26:: io.worker.3
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17c98 _pthread_cond_wait + 1192
2   Flutter                       	       0x1033b8798 std::_fl::condition_variable::wait(std::_fl::unique_lock<std::_fl::mutex>&) + 24
3   Flutter                       	       0x1033dcab4 fml::ConcurrentMessageLoop::WorkerMain() + 140
4   Flutter                       	       0x1033dd15c void* std::_fl::__thread_proxy[abi:nn210000]<std::_fl::tuple<std::_fl::unique_ptr<std::_fl::__thread_struct, std::_fl::default_delete<std::_fl::__thread_struct>>, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0>>(void*) + 192
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 27:: io.worker.4
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17c98 _pthread_cond_wait + 1192
2   Flutter                       	       0x1033b8798 std::_fl::condition_variable::wait(std::_fl::unique_lock<std::_fl::mutex>&) + 24
3   Flutter                       	       0x1033dcab4 fml::ConcurrentMessageLoop::WorkerMain() + 140
4   Flutter                       	       0x1033dd15c void* std::_fl::__thread_proxy[abi:nn210000]<std::_fl::tuple<std::_fl::unique_ptr<std::_fl::__thread_struct, std::_fl::default_delete<std::_fl::__thread_struct>>, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0>>(void*) + 192
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 28:: dart:io EventHandler
0   libsystem_kernel.dylib        	       0x100cbed84 kevent + 8
1   Flutter                       	       0x103839884 dart::bin::EventHandlerImplementation::EventHandlerEntry(unsigned long) + 304
2   Flutter                       	       0x103855934 dart::bin::ThreadStart(void*) + 92
3   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
4   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 29:: Dart Profiler ThreadInterrupter
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x103a05ac8 dart::ThreadInterrupter::ThreadMain(unsigned long) + 336
4   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 30:: Dart Profiler SampleBlockProcessor
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x1039bfd60 dart::SampleBlockProcessor::ThreadMain(unsigned long) + 292
4   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
5   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
6   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 31:: DartWorker
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x103a06868 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) + 512
4   Flutter                       	       0x103a069c8 dart::ThreadPool::Worker::Main(unsigned long) + 116
5   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
6   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
7   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 32:: DartWorker
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x103a06868 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) + 512
4   Flutter                       	       0x103a069c8 dart::ThreadPool::Worker::Main(unsigned long) + 116
5   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
6   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
7   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 33:: DartWorker
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x10390219c dart::MutatorThreadPool::OnEnterIdleLocked(dart::MutexLocker*, dart::ThreadPool::Worker*) + 156
4   Flutter                       	       0x103a066e4 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) + 124
5   Flutter                       	       0x103a069c8 dart::ThreadPool::Worker::Main(unsigned long) + 116
6   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
7   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
8   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8

Thread 34:: DartWorker
0   libsystem_kernel.dylib        	       0x100cbc72c __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x100b17cc4 _pthread_cond_wait + 1236
2   Flutter                       	       0x1038a30fc dart::ConditionVariable::WaitMicros(dart::Mutex*, long long) + 112
3   Flutter                       	       0x103a06868 dart::ThreadPool::WorkerLoop(dart::ThreadPool::Worker*) + 512
4   Flutter                       	       0x103a069c8 dart::ThreadPool::Worker::Main(unsigned long) + 116
5   Flutter                       	       0x1039bb138 dart::ThreadStart(void*) + 208
6   libsystem_pthread.dylib       	       0x100b176f8 _pthread_start + 104
7   libsystem_pthread.dylib       	       0x100b12940 thread_start + 8


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x00000001060aec30   x1: 0x0000000106835400   x2: 0x0000000116dae0e1   x3: 0x0000000040e289d2
    x4: 0x0000000000000003   x5: 0x0000000119925321   x6: 0x000000016f538bf0   x7: 0x0000000000000096
    x8: 0x00000001060aec30   x9: 0x0000000106835400  x10: 0xffc00000ffc00000  x11: 0x0000000000000002
   x12: 0x0000000000000001  x13: 0x00000000fffffd3c  x14: 0x00000000000007fb  x15: 0x000000016f538bf0
   x16: 0x0000000000000040  x17: 0x0000600002608600  x18: 0x0000000000000000  x19: 0x00000001060aec30
   x20: 0x00000001051c6658  x21: 0x0000000106835ae0  x22: 0xffc00000ffc00000  x23: 0x0000000105227000
   x24: 0x0000000105227000  x25: 0x0000000105227d80  x26: 0x0000000105233bf8  x27: 0x000000010180c038
   x28: 0x00000000141300c9   fp: 0x000000016f538d30   lr: 0x0000000103a05014
    sp: 0x000000016f538ce0   pc: 0x0000000103a16820 cpsr: 0x60001000
   far: 0xffc00000ffc00008  esr: 0x92000004 (Data Abort) byte read Translation fault

Binary Images:
       0x10092c000 -        0x1009affff dyld (*) <40bedd20-da23-3b70-a9c2-a1c68a738762> /usr/lib/dyld
       0x1008c4000 -        0x1008c7fff com.example.flutterSuperellipseCrash (1.0.0) <33694c59-1029-3ad1-a1bb-e16c169b0ede> /Users/USER/Library/Developer/CoreSimulator/Devices/C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46/data/Containers/Bundle/Application/F09ED67F-6720-4ED6-B13D-23ACEC627317/Runner.app/Runner
       0x100bf0000 -        0x100c33fff dyld_sim (*) <6499b476-4b66-3148-b85b-496aa7ea0690> /Volumes/VOLUME/*/dyld_sim
       0x100a74000 -        0x100a7bfff Runner.debug.dylib (*) <aae0939f-93f7-3c00-8cd3-91b1ae5452e0> /Users/USER/Library/Developer/CoreSimulator/Devices/C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46/data/Containers/Bundle/Application/F09ED67F-6720-4ED6-B13D-23ACEC627317/Runner.app/Runner.debug.dylib
       0x10334c000 -        0x105187fff io.flutter.flutter (1.0) <4c4c44e4-5555-3144-a101-0c9a6acc08e4> /Users/USER/Library/Developer/CoreSimulator/Devices/C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46/data/Containers/Bundle/Application/F09ED67F-6720-4ED6-B13D-23ACEC627317/Runner.app/Frameworks/Flutter.framework/Flutter
       0x100a54000 -        0x100a5bfff libsystem_platform.dylib (*) <cac022b0-a3f8-30b6-8328-16b8f49134fc> /usr/lib/system/libsystem_platform.dylib
       0x100cb8000 -        0x100cf3fff libsystem_kernel.dylib (*) <259ab955-09a7-3260-9fd3-c44d68acbe05> /usr/lib/system/libsystem_kernel.dylib
       0x100b10000 -        0x100b1ffff libsystem_pthread.dylib (*) <a7b14a67-6701-3dd4-b1ca-738197b71fb0> /usr/lib/system/libsystem_pthread.dylib
       0x100bcc000 -        0x100bd7fff libobjc-trampolines.dylib (*) <5456a55f-46e1-386f-a22e-35e385923f2d> /Volumes/VOLUME/*/libobjc-trampolines.dylib
       0x18038b000 -        0x18075afff com.apple.CoreFoundation (6.9) <5f40c0e3-6b50-30c6-a686-3ab03c9a5404> /Volumes/VOLUME/*/CoreFoundation.framework/CoreFoundation
       0x190180000 -        0x190188fff com.apple.GraphicsServices (1.0) <587e9fae-3ada-346c-a206-e2949d400fff> /Volumes/VOLUME/*/GraphicsServices.framework/GraphicsServices
       0x184c81000 -        0x186976fff com.apple.UIKitCore (1.0) <d41f23e0-fb5e-33e4-9687-bb277a61190f> /Volumes/VOLUME/*/UIKitCore.framework/UIKitCore
               0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
       0x1807da000 -        0x181420fff com.apple.Foundation (6.9) <1a4bc02e-f4dc-3ab5-9bb7-61d28064ffe8> /Volumes/VOLUME/*/Foundation.framework/Foundation
       0x1ca9e3000 -        0x1caa20fe7 libsystem_m.dylib (*) <3b293d3a-be74-3c65-b0ba-10aead5b16fd> /Volumes/VOLUME/*/libsystem_m.dylib
       0x1800f9000 -        0x180174ff3 libsystem_c.dylib (*) <7bdab434-28e5-3faf-a927-d854a96c40fa> /Volumes/VOLUME/*/libsystem_c.dylib

EOF

-----------
Full Report
-----------

{"app_name":"Runner","timestamp":"2025-10-12 17:37:31.00 +0500","app_version":"1.0.0","slice_uuid":"33694c59-1029-3ad1-a1bb-e16c169b0ede","build_version":"1","platform":7,"bundleID":"com.example.flutterSuperellipseCrash","share_with_app_devs":0,"is_first_party":0,"bug_type":"309","os_version":"macOS 15.0.1 (24A348)","roots_installed":0,"name":"Runner","incident_id":"E7DAC5B0-D56D-44B7-B974-BD7353A3AFC5"}
{
  "uptime" : 92000,
  "procRole" : "Foreground",
  "version" : 2,
  "userID" : 501,
  "deployVersion" : 210,
  "modelCode" : "Mac15,6",
  "coalitionID" : 1098,
  "osVersion" : {
    "train" : "macOS 15.0.1",
    "build" : "24A348",
    "releaseType" : "User"
  },
  "captureTime" : "2025-10-12 17:37:30.7867 +0500",
  "codeSigningMonitor" : 1,
  "incident" : "E7DAC5B0-D56D-44B7-B974-BD7353A3AFC5",
  "pid" : 77926,
  "translated" : false,
  "cpuType" : "ARM-64",
  "roots_installed" : 0,
  "bug_type" : "309",
  "procLaunch" : "2025-10-12 17:37:28.6327 +0500",
  "procStartAbsTime" : 2227787713682,
  "procExitAbsTime" : 2227839364986,
  "procName" : "Runner",
  "procPath" : "\/Users\/USER\/Library\/Developer\/CoreSimulator\/Devices\/C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46\/data\/Containers\/Bundle\/Application\/F09ED67F-6720-4ED6-B13D-23ACEC627317\/Runner.app\/Runner",
  "bundleInfo" : {"CFBundleShortVersionString":"1.0.0","CFBundleVersion":"1","CFBundleIdentifier":"com.example.flutterSuperellipseCrash"},
  "storeInfo" : {"deviceIdentifierForVendor":"BDAB507A-E92F-567D-8C1E-3504EA48BA3A","thirdParty":true},
  "parentProc" : "launchd_sim",
  "parentPid" : 2609,
  "coalitionName" : "com.apple.CoreSimulator.SimDevice.C9A53EC2-8D4F-4D3F-9E0E-DCB232768D46",
  "crashReporterKey" : "E9BE71AD-0211-4477-09AF-D3D79A912A42",
  "responsiblePid" : 2539,
  "responsibleProc" : "SimulatorTrampoline",
  "codeSigningID" : "com.example.flutterSuperellipseCrash",
  "codeSigningTeamID" : "",
  "codeSigningFlags" : 570425857,
  "codeSigningValidationCategory" : 10,
  "codeSigningTrustLevel" : 4294967295,
  "instructionByteStream" : {"beforePC":"FhBA+TYEALSXwACwmMAAsJnAALA5AzaR+sAAsFrjL5ECAAAUNgMAtA==","atPC":"29JAqdYCQPl\/Q0DxoQEAVPW6RvngAxWqrDH6lwi\/RvkfPQDxrAAAVA=="},
  "bootSessionUUID" : "87FD2B56-3E9A-4819-B261-B37A82F46863",
  "sip" : "enabled",
  "vmRegionInfo" : "0xffff8000ffc00008 is not in any region.  \n      REGION TYPE                    START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n      UNUSED SPACE AT START\n--->  \n      UNUSED SPACE AT END",
  "exception" : {"codes":"0x0000000000000001, 0xffc00000ffc00008","rawCodes":[1,-18014394218708984],"type":"EXC_BAD_ACCESS","signal":"SIGSEGV","subtype":"KERN_INVALID_ADDRESS at 0xffc00000ffc00008 -> 0xffff8000ffc00008 (possible pointer authentication failure)"},
  "termination" : {"flags":0,"code":11,"namespace":"SIGNAL","indicator":"Segmentation fault: 11","byProc":"exc handler","byPid":77926},
  "ktriageinfo" : "VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter\nVM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter\nVM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter\nVM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter\nVM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter\n",
  "vmregioninfo" : "0xffff8000ffc00008 is not in any region.  \n      REGION TYPE                    START - END         [ VSIZE] PRT\/MAX SHRMOD  REGION DETAIL\n      UNUSED SPACE AT START\n--->  \n      UNUSED SPACE AT END",
  "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
  "faultingThread" : 0,
  "threads" : [{"triggered":true,"id":6630540,"threadState":{"x":[{"value":4396346416},{"value":4404237312},{"value":4678410465},{"value":1088588242},{"value":3},{"value":4723987233},{"value":6162713584},{"value":150},{"value":4396346416},{"value":4404237312},{"value":18428729679490842624},{"value":2},{"value":1},{"value":4294966588},{"value":2043},{"value":6162713584},{"value":64},{"value":105553156146688},{"value":0},{"value":4396346416},{"value":4380714584,"symbolLocation":16,"symbol":"vtable for 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Thanks for the report. This only seems to occur in iOS simulator, as I tried the same with physical device in which the code ran properly without throwing any errors or crash.

stable: 3.3.5.6
master: 3.37.0-1.0.pre-420

@jason-simmons

Triage: @jason-simmons is going to take a stab at this. Perhaps @dkwingsmt has an idea too.

I took a brief look at the DrawCircularArc. The only thing I can suspect immediately is an out-of-bound access at Point* output. I'll let jason handle the investigation, but I'm happy to help with anything.

@dkwingsmt

This is crashing in a case in where:

RoundSuperellipseParam calls ComputeQuadrant with a corner and a center that have equal values in one of the dimensions
ComputeQuadrant then has a corner_vector where one of the coordinates is zero
The zero value later results in a call to ComputeOctant where the a parameter is zero
That causes ComputeOctant outputs like circle_max_angle to be calculated as NaN

Eventually DrawCircularArc receives the NaN, and its loop runs forever and goes out of bounds when writing points.

@dkwingsmt Not sure how best to handle this. Would it work to have ComputeOctant apply a special case for a zero a value similar to how it handles a zero radius?

I'm taking a look! Thanks for the investigation.

Fix RoundedSuperellipse crashes for tiny corners (#177070)

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.

Fix RoundedSuperellipse crashes for tiny corners (flutter#177070)

Fix RoundedSuperellipse crashes for tiny corners (#177070)

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[impeller]: superellipse crash in the engine on iOS simulator. #176894

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[impeller]: superellipse crash in the engine on iOS simulator. #176894

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darshankawar commented on Oct 13, 2025

darshankawar commented on Oct 13, 2025

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chinmaygarde commented on Oct 13, 2025

dkwingsmt commented on Oct 13, 2025

jason-simmons commented on Oct 14, 2025

dkwingsmt commented on Oct 14, 2025

github-actions commented on Nov 11, 2025

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