InvalidOperationException in case when default form value length limit exceeded.

[nlavri]

Having issue with large POST request.

I start debugging a project with VS 2019 using console (not IIS Express).
Make a 5 Mb x-www-form-urlencoded PSOT request with a pretty long field (comes from WYSIWYG editor).

And get InvalidOperationException: The examined position cannot be less than the previously examined position. at System.IO.Pipelines.ThrowHelper.ThrowInvalidOperationException_InvalidExaminedPosition()....

If I Change FormOptions.ValueLengthLimit to bigger value - everything works fine.

Are there any thoughts on why I'm not getting model error or something more meaningful ?

However if I debug via IIS Express I correctly see a model error like "Failed to read the request form. Form value length limit 4194304 exceeded."

[Tratcher]

Can you share the full stack trace?

What version is this?

This looks like #19476 which was addressed in 5.0.0-rc2 (#25799). Can you test your scenario on that release to confirm?

[nlavri]

@Tratcher thanks for the response.
Here is the full stack trace

System.InvalidOperationException: The examined position cannot be less than the previously examined position.
   at System.IO.Pipelines.ThrowHelper.ThrowInvalidOperationException_InvalidExaminedPosition()
   at System.IO.Pipelines.Pipe.AdvanceReader(BufferSegment consumedSegment, Int32 consumedIndex, BufferSegment examinedSegment, Int32 examinedIndex)
   at System.IO.Pipelines.Pipe.AdvanceReader(SequencePosition& consumed, SequencePosition& examined)
   at System.IO.Pipelines.Pipe.DefaultPipeReader.AdvanceTo(SequencePosition consumed, SequencePosition examined)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http2.Http2MessageBody.AdvanceTo(SequencePosition consumed, SequencePosition examined)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http2.Http2MessageBody.AdvanceTo(SequencePosition consumed)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpRequestPipeReader.AdvanceTo(SequencePosition consumed)
   at Microsoft.AspNetCore.WebUtilities.FormPipeReader.ReadFormAsync(CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Http.Features.FormFeature.InnerReadFormAsync(CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Mvc.ModelBinding.FormValueProviderFactory.AddValueProviderAsync(ValueProviderFactoryContext context)
   at Microsoft.AspNetCore.Mvc.ModelBinding.CompositeValueProvider.CreateAsync(ActionContext actionContext, IList`1 factories)
   at Microsoft.AspNetCore.Mvc.ModelBinding.CompositeValueProvider.TryCreateAsync(ActionContext actionContext, IList`1 factories)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

Web project references Microsoft.AspNetCore.App - 3.1.8

dotnet --version
3.1.403

Should I provide any details?
Also I don't run any load tests like in the issue you mentioned above. Just a single request.

UPD:
the same when i tried with new dotnet installed

dotnet --version
5.0.100-rc.2.20479.15

[Tratcher]

Thanks, I've confirmed this reproduces in the latest master branch and have filed #27585.