[Unhandled Exception]: System.ObjectDisposedException: This object is no longer valid because the MetadataLoadContext that created it has been disposed.

[pavelsavara]

Issue Description

Log

[] MSBUILD : error MSB4166: UNHANDLED EXCEPTIONS FROM PROCESS 1842:
[] MSBUILD : error MSB4166: =====================
[] MSBUILD : error MSB4166: 1/7/2025 5:29:23 PM
[] MSBUILD : error MSB4166: System.ObjectDisposedException: This object is no longer valid because the MetadataLoadContext that created it has been disposed.
[] MSBUILD : error MSB4166:    at System.Reflection.MetadataLoadContext.DisposeCheck()
[] MSBUILD : error MSB4166:    at System.Reflection.TypeLoading.Ecma.EcmaDefinitionType.ComputeDeclaringType()
[] MSBUILD : error MSB4166:    at System.Reflection.TypeLoading.RoType.get_DeclaringType()
[] MSBUILD : error MSB4166:    at System.Reflection.TypeLoading.RoDefinitionType.ComputeFullName()
[] MSBUILD : error MSB4166:    at System.Reflection.TypeLoading.RoType.get_FullName()
[] MSBUILD : error MSB4166:    at Microsoft.Build.Framework.LazyFormattedBuildEventArgs.WriteToStream(BinaryWriter writer)
[] MSBUILD : error MSB4166:    at Microsoft.Build.Framework.BuildMessageEventArgs.WriteToStream(BinaryWriter writer)
[] MSBUILD : error MSB4166:    at Microsoft.Build.Shared.LogMessagePacketBase.WriteToStream(ITranslator translator)
[] MSBUILD : error MSB4166:    at Microsoft.Build.BackEnd.NodeEndpointOutOfProcBase.RunReadLoop(Stream localReadPipe, Stream localWritePipe, ConcurrentQueue`1 localPacketQueue, AutoResetEvent localPacketAvailable, AutoResetEvent localTerminatePacketPump)
[] MSBUILD : error MSB4166: ===================

Steps to Reproduce

I don't know how to reproduce.
It happened only once AFAIK during Wasm.Build.Tests.PInvokeTableGeneratorTests of dotnet/runtime build.

Since it happened on Helix machine I also don't have the detailed log.

mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-22.04-helix-webassembly on a002M0D

.NET SDK Version: 10.0.100-alpha.1.24622.2

Actual Behavior

No exception

Analysis

No response

Versions & Configurations

No response

[pavelsavara]

It's quite possible that there is parent msbuild process and multiple child msbuild processes running in parallel

[JanKrivanek]

Thank you @pavelsavara for reporting!

On a first look it doesn't seem like msbuild would do anything wrong here - this seems to go from the type system.

@janvorli - would you be able to suggest who should have a look here?

[janvorli]

@davidwrighton do you have any thoughts on this?