NET10: ExecutionEngineException when calling Assembly.GetTypes()

[joergpichler]

Description

We are using NUnit-Console to fetch all tests from a test assembly. It works flawlessly under .NET Framework 4.8, .NET8 & .NET9 but after the switch to .NET10 NUnit-Console suddenly throws System.ExecutionEngineException. I debugged it a little bit and see it happening when it is calling Assembly.GetTypes(). Not sure how to provide more information on it currently.

Reproduction Steps

Using a simple test.dll it does not crash. Still trying to figure out how to create a minimal repro example.

Expected behavior

Does not crash

Actual behavior

Crashes

Call Stack:

 	[System.ExecutionEngineException unhandled]	
 	[Managed to Native Transition]	
>	System.Private.CoreLib.dll!System.Reflection.RuntimeModule.GetDefinedTypes() Line 408	C#
 	System.Private.CoreLib.dll!System.Reflection.RuntimeModule.GetTypes() Line 415	C#
 	nunit.framework.dll!NUnit.Framework.Api.DefaultTestAssemblyBuilder.GetCandidateFixtureTypes(System.Reflection.Assembly assembly, NUnit.Framework.Internal.PreFilter filter)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.DefaultTestAssemblyBuilder.GetFixtures(System.Reflection.Assembly assembly, NUnit.Framework.Internal.PreFilter filter)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.DefaultTestAssemblyBuilder.Build(System.Reflection.Assembly assembly, string assemblyNameOrPath, System.Collections.Generic.IDictionary<string, object> options)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.DefaultTestAssemblyBuilder.Build(System.Reflection.Assembly assembly, System.Collections.Generic.IDictionary<string, object> options)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.NUnitTestAssemblyRunner.Load.AnonymousMethod__0()	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.NUnitTestAssemblyRunner.WrapInNUnitCallContext<System.__Canon>(System.Func<System.__Canon> function)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.NUnitTestAssemblyRunner.Load(System.Reflection.Assembly assembly, System.Collections.Generic.IDictionary<string, object> settings)	Unknown
 	nunit.framework.dll!NUnit.Framework.Api.FrameworkController.LoadTests()	Unknown
 	[Lightweight Function]	
 	System.Private.CoreLib.dll!System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(object obj, System.Reflection.BindingFlags invokeAttr) Line 87	C#
 	nunit.engine.core.dll!NUnit.Engine.Drivers.NUnitNetCore31Driver.ExecuteMethod(System.Reflection.MethodInfo method, object[] args) Line 207	C#
 	nunit.engine.core.dll!NUnit.Engine.Drivers.NUnitNetCore31Driver.ExecuteMethod(string methodName, object[] args) Line 189	C#
 	nunit.engine.core.dll!NUnit.Engine.Drivers.NUnitNetCore31Driver.Load(string assemblyPath, System.Collections.Generic.IDictionary<string, object> settings) Line 104	C#
 	nunit.engine.core.dll!NUnit.Engine.Runners.DirectTestRunner.LoadDriver(NUnit.Engine.Extensibility.IFrameworkDriver driver, string testFile, NUnit.Engine.TestPackage subPackage) Line 136	C#
 	nunit.engine.core.dll!NUnit.Engine.Runners.DirectTestRunner.LoadPackage() Line 126	C#
 	nunit.engine.core.dll!NUnit.Engine.Runners.DirectTestRunner.EnsurePackageIsLoaded() Line 243	C#
 	nunit.engine.core.dll!NUnit.Engine.Runners.DirectTestRunner.Explore(NUnit.Engine.TestFilter filter) Line 67	C#
 	nunit.engine.core.dll!NUnit.Engine.Communication.Transports.Tcp.TestAgentTcpTransport.CommandLoop() Line 101	C#
 	System.Private.CoreLib.dll!System.Threading.Thread.StartCallback() Line 736	C#

Regression?

Works in .NET 8 & .NET9

Known Workarounds

No response

Configuration

Win 11 .NET 10.0.0

Other information

No response

[jkotas]

If you are not able to create a standalone repro and you are comfortable with sharing crash dumps with us, you can enable crash dumps by following https://learn.microsoft.com/en-us/dotnet/core/diagnostics/collect-dumps-crash, and then share the crash dump with us by opening issue at https://developercommunity.visualstudio.com/ and attaching the crashdump as a private attachment. (The crash dump contains like your local user name and environment.)

[joergpichler]

I have attached a dump file here https://developercommunity.visualstudio.com/t/NET10:-ExecutionEngineException-when-cal/11003734. I am kind of able to track it down to it having something to do with WPF related classes being referenced by the test assembly, still not able to do a minimal repro though unfortunately.

[jkotas]

This is .NET 9 -> .NET 10 regression.

The crash is triggered by a static field that:

• The type of the field must be a struct type
• The struct type lives in external assembly.
• The external assembly exists, but the struct type is missing in that assembly.

The field in triggering the crash in your tests is draggableVector that has type System.Windows.Vector. This type lives in WindowsBase.dll. There are two version of WindowsBase.dll: The full version that you get when your TargetFramework is set to net10.0-windows, and minimal version that you get when your TargetFramework is set to net10.0. Your test assembly was built against TargetFramework net10.0-windows, but it is running against net10.0 that does not have the System.Windows.Vector type. You should be able to workaround the crash by making sure that you run the tests against TargetFramework net10.0-windows.