Synchronous call inside XDocument.LoadAsync #100239
Description
Description
Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
at MyMiddleware.InvokeAsync(HttpContext context)
at System.Xml.Linq.XDocument.LoadAsync(TextReader textReader, LoadOptions options, CancellationToken cancellationToken)
at System.Xml.Linq.XDocument.LoadAsyncInternal(XmlReader reader, LoadOptions options, CancellationToken cancellationToken)
at System.Xml.Linq.XDeclaration..ctor(XmlReader r)
at System.Xml.XmlTextReaderImpl.ParseDocumentContent()
at System.Xml.XmlTextReaderImpl.ParseElement()
at System.Xml.XmlTextReaderImpl.ParseAttributes()
at System.Xml.XmlTextReaderImpl.ParseAttributeValueSlow(Int32 curPos, Char quoteChar, NodeData attr)
at System.Xml.XmlTextReaderImpl.ReadData()
at System.IO.StreamReader.Read(Char[] buffer, Int32 index, Int32 count)
at System.IO.StreamReader.ReadSpan(Span`1 buffer)
at System.IO.StreamReader.ReadBuffer(Span`1 userBuffer, Boolean& readToUserBuffer)
at Microsoft.AspNetCore.WebUtilities.FileBufferingReadStream.Read(Span`1 buffer)
at System.IO.Stream.Read(Span`1 buffer)
at System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
Reproduction Steps
I don't have the actual XML request that caused it but I think it's pretty clear from call stack that LoadAsyncInternal creates XDeclaration and the ctor there reads attributes and does it in a non-async way.
Expected behavior
XDocument.LoadAsync should be fully async
Actual behavior
Throws Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.
Regression?
No
Known Workarounds
Allow syncIO
builder.WebHost.ConfigureKestrel((_, options) =>
{
options.AllowSynchronousIO = true;
});
Configuration
latest aspnet core docker image: 8.0.3-bookworm-slim-amd64
https://github.com/dotnet/dotnet-docker/blob/9ffd75ed9a9a8790e7c7af5c925eefe7e4015bc1/src/aspnet/8.0/bookworm-slim/amd64/Dockerfile
Other information
No response