GetProjectOptionsFromScript raises Internal CLR error

[nojaf]

Another SDK release, another lament.

I'm using fsdocs which processes some scripts to generate HTML. What worked yesterday, stopped working after I downloaded dotnet 8 RC 1.

Fatal error. Internal CLR error. (0x80131506)
   at System.Runtime.Serialization.SerializationGuard.<ThrowIfDeserializationInProgress>g__ThrowIfDeserializationInProgress|0_0(System.Runtime.Serialization.SerializationInfo, System.String, Int32 ByRef)
   at System.Diagnostics.Process.Start()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver.executeProcess$cont@56(System.String, System.String, Microsoft.FSharp.Core.FSharpOption`1<System.String>, Int32, Microsoft.FSharp.Core.Unit)
   at FSharp.Compiler.FxResolver.executeProcess(System.String, System.String, Microsoft.FSharp.Core.FSharpOption`1<System.String>, Int32)
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+clo@118-443.Invoke(System.String)
   at System.Collections.Concurrent.ConcurrentDictionary`2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Microsoft.FSharp.Core.FSharpResult`2[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], FSharp.Core, Version=7.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].GetOrAdd(System.__Canon, System.Func`2<System.__Canon,Microsoft.FSharp.Core.FSharpResult`2<System.__Canon,System.__Canon>>)
   at FSharp.Compiler.FxResolver.tryGetDesiredDotNetSdkVersionForDirectoryInfo()
   at FSharp.Compiler.FxResolver.tryGetDesiredDotNetSdkVersionForDirectory()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+-ctor@164-77.Invoke(Microsoft.FSharp.Core.Unit)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
   at FSharp.Compiler.FxResolver.tryGetSdkDir()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+-ctor@223-80.Invoke(Microsoft.FSharp.Core.Unit)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
   at FSharp.Compiler.FxResolver.getImplementationAssemblyDir()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+-ctor@360-81.Invoke(Microsoft.FSharp.Core.Unit)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
   at FSharp.Compiler.FxResolver.tryGetNetCoreRefsPackDirectoryRoot()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+-ctor@422-82.Invoke(Microsoft.FSharp.Core.Unit)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
   at FSharp.Compiler.FxResolver.tryGetSdkRefsPackDirectory()
   at <StartupCode$FSharp-Compiler-Service>.$FxResolver+GetDefaultReferences@919.Invoke(FSharp.Compiler.FxResolverLockToken)
   at Internal.Utilities.Library.Lock`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].AcquireLock[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.FSharp.Core.FSharpFunc`2<System.__Canon,System.__Canon>)
   at FSharp.Compiler.FxResolver.GetDefaultReferences(Boolean)
   at FSharp.Compiler.ScriptClosure+ScriptPreprocessClosure.CreateScriptTextTcConfig[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, System.String, System.String, CodeContext, Boolean, Boolean,
 Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`2<System.__Canon,Microsoft.FSharp.Collections.FSharpList`1<System.Tuple`2<PhasedDiagnostic,FSharp.Compiler.Diagnostics.FSharpDiagnosticSeverity>>>>, Microsoft.FSharp.Core.FSharpFunc`2<TcConfigBuilder,Microsoft.FSharp.Core.Unit>, Boolean, Boolean, Microsoft.FSharp.Core.FSharpOption`1<System.String>, Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`2<System.String,System.DateTime>,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`3<System.Object,IntPtr,Int32>>>, ReduceMemoryFlag)
   at FSharp.Compiler.ScriptClosure+ScriptPreprocessClosure.GetFullClosureOfScriptText(FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, System.String, System.String, FSharp.Compiler.Text.ISourceText, CodeContext, Boolean, Boolean, Boolean, Microsoft.FSharp.Core.FSharpOption`1<System.String>, LexResourc
eManager, Microsoft.FSharp.Core.FSharpFunc`2<TcConfigBuilder,Microsoft.FSharp.Core.Unit>, Boolean, Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`2<System.String,System.DateTime>,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`3<System.Object,IntPtr,Int32>>>, ReduceMemoryFlag, FSharp.Compiler.DependencyManager.DependencyProvider)
   at FSharp.Compiler.ScriptClosure+LoadClosure.ComputeClosureOfScriptText(FSharp.Compiler.CodeAnalysis.LegacyReferenceResolver, System.String, System.String, FSharp.Compiler.Text.ISourceText, CodeContext, Boolean, Boolean, Boolean, Microsoft.FSharp.Core.FSharpOption`1<System.String>, LexResourceManager, Mi
crosoft.FSharp.Core.FSharpFunc`2<TcConfigBuilder,Microsoft.FSharp.Core.Unit>, Boolean, Microsoft.FSharp.Core.FSharpFunc`2<System.Tuple`2<System.String,System.DateTime>,Microsoft.FSharp.Core.FSharpOption`1<System.Tuple`3<System.Object,IntPtr,Int32>>>, ReduceMemoryFlag, FSharp.Compiler.DependencyManager.DependencyProvider)
   at <StartupCode$FSharp-Compiler-Service>.$Service+GetProjectOptionsFromScript@1141-1.Invoke(System.Threading.CancellationToken)
   at Internal.Utilities.Library.Cancellable+toAsync@898-1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Invoke(System.Threading.CancellationToken)
   at Microsoft.FSharp.Control.AsyncPrimitives.CallThenInvokeNoHijackCheck[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Threading.CancellationToken, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.FSharp.Control.AsyncActivation`1<System.__Canon>, System.Threading.CancellationToken, Microsoft.FSharp.Core.FSharpFunc`2<System.Threading.CancellationToken,Microsoft.FSharp.Control.FSharpAsync`1<System.__Canon>>)
   at Microsoft.FSharp.Control.Trampoline.Execute(Microsoft.FSharp.Core.FSharpFunc`2<Microsoft.FSharp.Core.Unit,Microsoft.FSharp.Control.AsyncReturn>)
   at Microsoft.FSharp.Control.AsyncPrimitives.RunImmediate[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Threading.CancellationToken, Microsoft.FSharp.Control.FSharpAsync`1<System.__Canon>)
   at Microsoft.FSharp.Control.AsyncPrimitives.RunSynchronously[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.Threading.CancellationToken, Microsoft.FSharp.Control.FSharpAsync`1<System.__Canon>, Microsoft.FSharp.Core.FSharpOption`1<Int32>)
   at Microsoft.FSharp.Control.FSharpAsync.RunSynchronously[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.FSharp.Control.FSharpAsync`1<System.__Canon>, Microsoft.FSharp.Core.FSharpOption`1<Int32>, Microsoft.FSharp.Core.FSharpOption`1<System.Threading.CancellationToken>)
   at FSharp.Formatting.Internal.CompilerServiceExtensions+FSharpAssemblyHelper+getNetCoreAppFrameworkDependencies@71.Invoke(Microsoft.FSharp.Core.Unit)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ViaFactory(System.Threading.LazyThreadSafetyMode)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecutionAndPublication(System.LazyHelper, Boolean)
   at System.Lazy`1[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].CreateValue()
   at FSharp.Formatting.Internal.CompilerServiceExtensions+FSharpAssemblyHelper.getCheckerArguments[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon, System.__Canon, Boolean, Microsoft.FSharp.Core.FSharpOption`1<System.String>, System.Collections.Generic.IEnumerable`1<System.String>, System.Collections.Generic.IEnumerable`1<System.String>, System.Collections.Generic.IEnumerable`1<System.String>)
   at FSharp.Formatting.CodeFormat.CodeFormatter+processSourceCode@353-1.Invoke(System.IO.StringReader)
   at Microsoft.FSharp.Control.AsyncPrimitives.CallThenInvoke[[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.__Canon, System.Private.CoreLib, Version=8.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.FSharp.Control.AsyncActivation`1<System.__Canon>, System.__Canon, Microsoft.FSharp.Core.FSharpFunc`2<System.__Canon,Microsoft.FSharp.Control.FSharpAsync`1<System.__Canon>>)
   at Microsoft.FSharp.Control.Trampoline.Execute(Microsoft.FSharp.Core.FSharpFunc`2<Microsoft.FSharp.Core.Unit,Microsoft.FSharp.Control.AsyncReturn>)
   at <StartupCode$FSharp-Core>.$Async+clo@193-15.Invoke(System.Object)
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

Process finished with exit code -1,073,741,819

Repro steps

• Install the RC 1 SDK
• Create console application
• Add reference to FCS (dotnet add package FSharp.Compiler.Service --version 43.8.100-preview.23418.2)
• Update Program.fs:

open System.IO
open FSharp.Compiler.CodeAnalysis
open FSharp.Compiler.Text

let checker = FSharpChecker.Create()

let tempFile = Path.GetTempFileName() |> (fun p -> Path.ChangeExtension(p, ".fsx"))
printfn "%s" tempFile
File.Create(tempFile).Dispose()

let options =
    checker.GetProjectOptionsFromScript(
        tempFile,
        SourceText.ofString "",
        assumeDotNetFramework = false
    )
    |> Async.RunSynchronously

File.Delete tempFile

printfn "%A" options

Expected behaviour

I'm able to get the project options.

Actual behaviour

This is failing to execute dotnet --version in

fsharp/src/Compiler/Driver/FxResolver.fs

Lines 54 to 111 in 88b14c4

	let executeProcess pathToExe arguments (workingDir: string option) timeout =
	if not (String.IsNullOrEmpty pathToExe) then
	let errorsList = ResizeArray()
	let outputList = ResizeArray()
	let mutable errorslock = obj
	let mutable outputlock = obj
	let outputDataReceived (message: string MaybeNull) =
	match message with
	| Null -> ()
	| NonNull message -> lock outputlock (fun () -> outputList.Add(message))
	let errorDataReceived (message: string MaybeNull) =
	match message with
	| Null -> ()
	| NonNull message -> lock errorslock (fun () -> errorsList.Add(message))
	let psi = ProcessStartInfo()
	psi.FileName <- pathToExe
	if workingDir.IsSome then
	psi.WorkingDirectory <- workingDir.Value
	psi.RedirectStandardOutput <- true
	psi.RedirectStandardError <- true
	psi.Arguments <- arguments
	psi.CreateNoWindow <- true
	psi.EnvironmentVariables.Remove("MSBuildSDKsPath") // Host can sometimes add this, and it can break things
	psi.UseShellExecute <- false
	use p = new Process()
	p.StartInfo <- psi
	p.OutputDataReceived.Add(fun a -> outputDataReceived a.Data)
	p.ErrorDataReceived.Add(fun a -> errorDataReceived a.Data)
	if p.Start() then
	p.BeginOutputReadLine()
	p.BeginErrorReadLine()
	if not (p.WaitForExit(timeout)) then
	// Timed out resolving throw a diagnostic.
	raise (TimeoutException(sprintf "Timeout executing command '%s' '%s'" psi.FileName psi.Arguments))
	else
	p.WaitForExit()
	#if DEBUG
	if workingDir.IsSome then
	FileSystem
	.OpenFileForWriteShim(Path.Combine(workingDir.Value, "StandardOutput.txt"))
	.WriteAllLines(outputList)
	FileSystem
	.OpenFileForWriteShim(Path.Combine(workingDir.Value, "StandardError.txt"))
	.WriteAllLines(errorsList)
	#endif
	p.ExitCode, outputList.ToArray(), errorsList.ToArray()
	else
	-1, Array.empty, Array.empty

Fatal error. Internal CLR error. (0x80131506)

What is very frustrating is that the unit tests in

fsharp/tests/service/ScriptOptionsTests.fs

Lines 26 to 45 in a296258

	[<TestCase(false, false, [| "--targetprofile:mscorlib" |])>]
	[<TestCase(false, true, [| "--targetprofile:mscorlib" |])>]
	[<TestCase(true, true, [| "--targetprofile:mscorlib" |])>]
	[<TestCase(false, false, [| "--targetprofile:netstandard" |])>]
	[<TestCase(false, true, [| "--targetprofile:netstandard" |])>]
	[<TestCase(true, true, [| "--targetprofile:netstandard" |])>]
	[<TestCase(false, false, [| "--targetprofile:netcore" |])>]
	[<TestCase(false, true, [| "--targetprofile:netcore" |])>]
	[<TestCase(true, true, [| "--targetprofile:netcore" |])>]
	[<Test>]
	let ``can generate options for different frameworks regardless of execution environment - useSdkRefs = false``(assumeDotNetFramework, useSdkRefs, flags) =
	let path = Path.GetTempPath()
	let file = tryCreateTemporaryFileName () + ".fsx"
	let tempFile = Path.Combine(path, file)
	let _, errors =
	checker.GetProjectOptionsFromScript(tempFile, SourceText.ofString scriptSource, assumeDotNetFramework = assumeDotNetFramework, useSdkRefs = useSdkRefs, otherFlags = flags)
	|> Async.RunImmediate
	match errors with
	| [] -> ()
	| errors -> failwithf "Error while parsing script with otherFlags:%A:\n%A" flags errors

are still working for me on my local machine.

Known workarounds

/

Related information

Provide any related information (optional):

• Operating system Windows 11
• .NET Runtime: .NET 8 rc 1

[vzarytovskii]

Is there a smaller repro which does not involve the FCS? Also, does it change the behaviour if language version is set to 7?

[vzarytovskii]

Also, does this fail on older runtime, but same FCS package?

[vzarytovskii]

Looks similar to dotnet/runtime#90962 and dotnet/runtime#90485
cc @EgorBo @jkotas (pinging since you were replying/investigating the original issue)

[nojaf]

Is there a smaller repro which does not involve the FCS?

open System
open System.Diagnostics

type 'T MaybeNull when 'T: null and 'T: not struct = 'T
let inline (|Null|NonNull|) (x: 'T) : Choice<unit, 'T> =
    match x with
    | null -> Null
    | v -> NonNull v

let executeProcess pathToExe arguments (workingDir: string option) (timeout: int) =
    if not (String.IsNullOrEmpty pathToExe) then
        let errorsList = ResizeArray()
        let outputList = ResizeArray()
        let mutable errorslock = obj
        let mutable outputlock = obj

        let outputDataReceived (message: string MaybeNull) =
            match message with
            | Null -> ()
            | NonNull message -> lock outputlock (fun () -> outputList.Add(message))

        let errorDataReceived (message: string MaybeNull) =
            match message with
            | Null -> ()
            | NonNull message -> lock errorslock (fun () -> errorsList.Add(message))

        let psi = ProcessStartInfo()
        psi.FileName <- pathToExe

        if workingDir.IsSome then
            psi.WorkingDirectory <- workingDir.Value

        psi.RedirectStandardOutput <- true
        psi.RedirectStandardError <- true
        psi.Arguments <- arguments
        psi.CreateNoWindow <- true
        psi.EnvironmentVariables.Remove("MSBuildSDKsPath") // Host can sometimes add this, and it can break things
        psi.UseShellExecute <- false

        use p = new Process()
        p.StartInfo <- psi

        p.OutputDataReceived.Add(fun a -> outputDataReceived a.Data)
        p.ErrorDataReceived.Add(fun a -> errorDataReceived a.Data)

        try
            if p.Start() then
                p.BeginOutputReadLine()
                p.BeginErrorReadLine()

                if not (p.WaitForExit(timeout)) then
                    // Timed out resolving throw a diagnostic.
                    raise (TimeoutException(sprintf "Timeout executing command '%s' '%s'" psi.FileName psi.Arguments))
                else
                    p.WaitForExit()

            p.ExitCode, outputList.ToArray(), errorsList.ToArray()
        with ex ->
            ignore errorsList
            raise ex 
    else
        -1, Array.empty, Array.empty
        
executeProcess @"C:\Program Files\dotnet\dotnet.exe" "--version" None 3000
|> printfn "%A"

Also, does it change the behaviour if language version is set to 7?

What do I need to do for that? language version could means a number of different things I suppose.

[vzarytovskii]

open System
open System.Diagnostics

type 'T MaybeNull when 'T: null and 'T: not struct = 'T
let inline (|Null|NonNull|) (x: 'T) : Choice<unit, 'T> =
    match x with
    | null -> Null
    | v -> NonNull v

let executeProcess pathToExe arguments (workingDir: string option) (timeout: int) =
    if not (String.IsNullOrEmpty pathToExe) then
        let errorsList = ResizeArray()
        let outputList = ResizeArray()
        let mutable errorslock = obj
        let mutable outputlock = obj

        let outputDataReceived (message: string MaybeNull) =
            match message with
            | Null -> ()
            | NonNull message -> lock outputlock (fun () -> outputList.Add(message))

        let errorDataReceived (message: string MaybeNull) =
            match message with
            | Null -> ()
            | NonNull message -> lock errorslock (fun () -> errorsList.Add(message))

        let psi = ProcessStartInfo()
        psi.FileName <- pathToExe

        if workingDir.IsSome then
            psi.WorkingDirectory <- workingDir.Value

        psi.RedirectStandardOutput <- true
        psi.RedirectStandardError <- true
        psi.Arguments <- arguments
        psi.CreateNoWindow <- true
        psi.EnvironmentVariables.Remove("MSBuildSDKsPath") // Host can sometimes add this, and it can break things
        psi.UseShellExecute <- false

        use p = new Process()
        p.StartInfo <- psi

        p.OutputDataReceived.Add(fun a -> outputDataReceived a.Data)
        p.ErrorDataReceived.Add(fun a -> errorDataReceived a.Data)

        try
            if p.Start() then
                p.BeginOutputReadLine()
                p.BeginErrorReadLine()

                if not (p.WaitForExit(timeout)) then
                    // Timed out resolving throw a diagnostic.
                    raise (TimeoutException(sprintf "Timeout executing command '%s' '%s'" psi.FileName psi.Arguments))
                else
                    p.WaitForExit()

            p.ExitCode, outputList.ToArray(), errorsList.ToArray()
        with ex ->
            ignore errorsList
            raise ex 
    else
        -1, Array.empty, Array.empty
        
executeProcess @"C:\Program Files\dotnet\dotnet.exe" "--version" None 3000
|> printfn "%A"

I can't reproduce it on my machine on rc1

[jkotas]

Looks similar to dotnet/runtime#90962 and dotnet/runtime#90485

Yes, this is a duplicate.

I can't reproduce it on my machine on rc1

This crash will only reproduce if you have active ETW or EventPipe trace session that is capturing method IL. Code alone is not enough to hit the crash.

[vzarytovskii]

Looks similar to dotnet/runtime#90962 and dotnet/runtime#90485

Yes, this is a duplicate.

I can't reproduce it on my machine on rc1

This crash will only reproduce if you have active ETW or EventPipe trace session that is capturing method IL. Code alone is not enough to hit the crash.

Got it, thanks, Jan.

@nojaf I presume, it should be fixed in rc2. Shall we close this one as a dupe, or would you like to leave it open until we update?

[nojaf]

Could we leave it open for a few more days?
It would be nice if someone else could reproduce this based on my sample.
Would the latest nightly already have the fix for this you think?