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Native blob disposal from finalizer thread

See original GitHub issue

Describe the bug

Native blob disposal from finalizer thread
Backtrace:    at System.Environment.get_StackTrace()
   at Avalonia.Platform.Internal.UnmanagedBlob.Dispose() in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Platform/Internal/UnmanagedBlob.cs:line 87
   at Avalonia.Skia.WriteableBitmapImpl.ReleaseProc(IntPtr address, Object ctx) in /home/spaccabit/GitHub/Avalonia/src/Skia/Avalonia.Skia/WriteableBitmapImpl.cs:line 177
   at SkiaSharp.SKBitmap.<>c__DisplayClass108_0.<InstallPixels>b__0(IntPtr addr, Object _)
   at SkiaSharp.DelegateProxies.SKBitmapReleaseDelegateProxyImplementation(Void* address, Void* context)
   at SkiaSharp.SkiaApi.sk_bitmap_destructor(IntPtr cbitmap)
   at SkiaSharp.SkiaApi.sk_bitmap_destructor(IntPtr cbitmap)
   at SkiaSharp.SKBitmap.DisposeNative()
   at SkiaSharp.SKNativeObject.Dispose(Boolean disposing)
   at SkiaSharp.SKBitmap.Dispose(Boolean disposing)
   at SkiaSharp.SKNativeObject.Finalize()

Blob created by    at System.Environment.get_StackTrace()
   at Avalonia.Platform.Internal.UnmanagedBlob..ctor(Int32 size) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Platform/Internal/UnmanagedBlob.cs:line 53
   at Avalonia.Platform.StandardRuntimePlatform.AllocBlob(Int32 size) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Platform/StandardRuntimePlatform.cs:line 15
   at Avalonia.Skia.WriteableBitmapImpl..ctor(PixelSize size, Vector dpi, PixelFormat format, AlphaFormat alphaFormat) in /home/spaccabit/GitHub/Avalonia/src/Skia/Avalonia.Skia/WriteableBitmapImpl.cs:line 107
   at Avalonia.Skia.PlatformRenderInterface.CreateWriteableBitmap(PixelSize size, Vector dpi, PixelFormat format, AlphaFormat alphaFormat) in /home/spaccabit/GitHub/Avalonia/src/Skia/Avalonia.Skia/PlatformRenderInterface.cs:line 228
   at Avalonia.Media.Imaging.WriteableBitmap.CreatePlatformImpl(PixelSize size, Vector& dpi, Nullable`1 format, Nullable`1 alphaFormat) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Media/Imaging/WriteableBitmap.cs:line 77
   at Avalonia.Media.Imaging.WriteableBitmap..ctor(PixelSize size, Vector dpi, Nullable`1 format, Nullable`1 alphaFormat) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Media/Imaging/WriteableBitmap.cs:line 22
   at Avalonia.Controls.Primitives.ColorPickerHelpers.CreateBitmapFromPixelData(IList`1 bgraPixelData, Int32 pixelWidth, Int32 pixelHeight) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Controls.ColorPicker/Helpers/ColorPickerHelpers.cs:line 614
   at Avalonia.Controls.Primitives.ColorSlider.UpdateBackground() in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Controls.ColorPicker/ColorSlider/ColorSlider.cs:line 113
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.ExecutionContextCallback(Object s)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext(Thread threadPoolThread)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext()
   at System.Threading.Tasks.AwaitTaskContinuation.<>c.<.cctor>b__17_0(Object state)
   at System.Threading.Tasks.AwaitTaskContinuation.RunCallback(ContextCallback callback, Object state, Task& currentTask)
   at System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.Run(Task task, Boolean canInlineContinuationTask)
   at System.Threading.Tasks.Task.RunContinuations(Object continuationObject)
   at System.Threading.Tasks.Task`1.TrySetResult(TResult result)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetExistingTaskResult(Task`1 task, TResult result)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.SetResult(TResult result)
   at Avalonia.Controls.Primitives.ColorPickerHelpers.CreateComponentBitmapAsync(Int32 width, Int32 height, Orientation orientation, ColorModel colorModel, ColorComponent component, HsvColor baseHsvColor, Boolean isAlphaMaxForced, Boolean isSaturationValueMaxForced) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Controls.ColorPicker/Helpers/ColorPickerHelpers.cs:line 307
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.ExecutionContextCallback(Object s)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext(Thread threadPoolThread)
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1.AsyncStateMachineBox`1.MoveNext()
   at System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.<>c.<.cctor>b__8_0(Object state)
   at Avalonia.Threading.JobRunner.JobWithArg.Avalonia.Threading.JobRunner.IJob.Run() in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Threading/JobRunner.cs:line 241
   at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Threading/JobRunner.cs:line 38
   at Avalonia.Controls.Platform.InternalPlatformThreadingInterface.RunLoop(CancellationToken cancellationToken) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Controls/Platform/InternalPlatformThreadingInterface.cs:line 27
   at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Threading/Dispatcher.cs:line 61
   at Avalonia.Controls.DesktopApplicationExtensions.Run(Application app, CancellationToken token) in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Controls/DesktopApplicationExtensions.cs:line 55
   at LinuxFramebufferPlatformExtensions.StartLinuxDirect[T](T builder, String[] args, IOutputBackend outputBackend, IInputBackend inputBackend) in /home/spaccabit/GitHub/Avalonia/src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs:line 162
   at LinuxFramebufferPlatformExtensions.StartLinuxFbDev[T](T builder, String[] args, String fbdev, Double scaling, IInputBackend inputBackend) in /home/spaccabit/GitHub/Avalonia/src/Linux/Avalonia.LinuxFramebuffer/LinuxFramebufferPlatform.cs:line 146
   at ControlCatalog.NetCore.Program.Main(String[] args) in /home/spaccabit/GitHub/Avalonia/samples/ControlCatalog.NetCore/Program.cs:line 47
Native blob disposal from finalizer thread
Backtrace:    at System.Environment.get_StackTrace()
   at Avalonia.Platform.Internal.UnmanagedBlob.Dispose() in /home/spaccabit/GitHub/Avalonia/src/Avalonia.Base/Platform/Internal/UnmanagedBlob.cs:line 87
   at Avalonia.Skia.WriteableBitmapImpl.ReleaseProc(IntPtr address, Object ctx) in /home/spaccabit/GitHub/Avalonia/src/Skia/Avalonia.Skia/WriteableBitmapImpl.cs:line 177
   at SkiaSharp.SKBitmap.<>c__DisplayClass108_0.<InstallPixels>b__0(IntPtr addr, Object _)
   at SkiaSharp.DelegateProxies.SKBitmapReleaseDelegateProxyImplementation(Void* address, Void* context)
   at SkiaSharp.SkiaApi.sk_bitmap_destructor(IntPtr cbitmap)
   at SkiaSharp.SkiaApi.sk_bitmap_destructor(IntPtr cbitmap)
   at SkiaSharp.SKBitmap.DisposeNative()
   at SkiaSharp.SKNativeObject.Dispose(Boolean disposing)
   at SkiaSharp.SKBitmap.Dispose(Boolean disposing)
   at SkiaSharp.SKNativeObject.Finalize()

To Reproduce Steps to reproduce the behavior:

Build Avalonia
Go to Linux Terminal
Go to samples/ControlCatalog.NetCore/bin/Debug/net6.0
Write dotnet ControlCatalog.NetCore.dll
Go ColorPicker example
See error in console

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

OS: Linux Ubuntu 22.04.1 64bit
Version: 84791dbf2e772cad889d575ef64000b5ba3d637a

Additional context Add any other context about the problem here.

Issue Analytics

State:
Created a year ago
Comments:10 (10 by maintainers)

Top GitHub Comments

2reactions

robloocommented, Sep 29, 2022

I’ve been very uncomfortable with WritableBitmap usage in Avalonia as discussed in the first PR.

https://github.com/AvaloniaUI/Avalonia/blob/84791dbf2e772cad889d575ef64000b5ba3d637a/src/Avalonia.Controls.ColorPicker/Helpers/ColorPickerHelpers.cs#L620-L624

WritableBitmaps should be abstracted more for a managed environment IMO and not treated like native code. I wasn’t even aware disposal of these was necessary… probably should have been though. We definitely need more docs on this.

Anyway, I’ll fix disposal using the current WritableBitmap design along with a few other things in the next ColorPicker PR.

0reactions

workgroupengineeringcommented, Jan 16, 2023

fixed in master 7dd09cd2a5e85bd006265a5a4e6a2c39b087c4e8

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