PdfDocument spawns zombie process

[neelabo]

Describe the bug

When I use PdfDocument in WPF, the process remains even after closing the app.

To Reproduce

• Run PdfPage.RenderToStreamAsync() no longer terminates the app.
• GC.Collect() increases the recall of this phenomenon to 100%. Relevance to the phenomenon is unknown.
• There is no problem when debugging with VisualStudio2022. "Start without debugging" reproduces it.

Expected behavior

App should be terminated normally

Version Info

• Windows 10 Pro 64bit 21H2 19044.1889
• Radeon RX 560, AMD Software: Adrenalin Edition 22.5.1
• VisualStudio2022 Version 17.2.6
• WPF Application
• TargetFramework: net6.0-windows10.0.17763.0

Additional context

Below is the reproducible code.

    public partial class App : Application
    {
        private async void Application_Startup(object sender, StartupEventArgs e)
        {
            await GetPdfPageStream(@"sample.pdf", 0);
            GC.Collect();
            this.Shutdown();
        }

        private static async Task<MemoryStream> GetPdfPageStream(string path, uint index)
        {
            using var pdfStream = File.OpenRead(path);
            using var winrtStream = pdfStream.AsRandomAccessStream();
            var pdfDocument = await PdfDocument.LoadFromStreamAsync(winrtStream);
            using var pdfPage = pdfDocument.GetPage((uint)index);
            var ms = new MemoryStream();
            var outStream = ms.AsRandomAccessStream();
            await pdfPage.RenderToStreamAsync(outStream);
            ms.Seek(0, SeekOrigin.Begin);
            return ms;
        }
    }

[Marv51]

See also: https://stackoverflow.com/questions/50930684/wpf-app-not-exiting-because-of-uwp-pdfdocument

[neelabo]

Added the graphics driver version to the post. AMD's latest version of the driver.

[neelabo]

The debug run appeared to complete successfully, but actually ended with an error. The program '[23248] PdfTest.exe' has exited with code 3221225477 (0xc0000005) 'Access violation'.