Added the repro test case

Commit migrated from https://github.com/dotnet/coreclr/commit/89968de88fa5d036f86a95772cd292d44ab4b23c

diff --git a/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.cs b/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.cs
new file mode 100644 (file)
index 0000000..c51de26
--- /dev/null
+++ b/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.cs
@@ -0,0 +1,115 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Threading;
+using System.Runtime.CompilerServices;
+
+internal class BufferState
+{
+    internal const int Idle = 0;
+    internal const int InUse = 1;
+
+    private int currentState;
+    
+    internal BufferState()
+    {
+        this.currentState = Idle;
+    }
+
+    internal bool IsIdle
+    {
+        get { return this.currentState == Idle; }
+    }
+    
+    internal bool EnterInUseState()
+    {
+        return this.TransitionState(Idle, InUse);
+    }
+    
+    internal bool EnterIdleState()
+    {
+        return this.TransitionState(InUse, Idle);
+    }
+    
+    private bool TransitionState(int expectedCurrentState, int desiredState)
+    {
+        if (Interlocked.CompareExchange(ref this.currentState,
+                                        desiredState,
+                                        expectedCurrentState) == expectedCurrentState)
+        {
+            return true;
+        }
+        
+        return false;
+    }
+}
+
+class Program
+{
+    bool forceUpload;
+    BufferState currentState;
+
+    Program()
+    {
+        this.forceUpload = false;
+        this.currentState = new BufferState();
+        while(!this.currentState.EnterInUseState())
+        {
+            Console.WriteLine("Failed to enterInUseState");
+        }
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public void ThrowIfDisposed()
+    {
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public void QueueCurrentBufferForUploadAndSetNewBuffer()
+    {
+    }
+
+    public void Test()
+    {
+        this.ThrowIfDisposed();
+
+        try
+        {
+            if (forceUpload == true)
+            {
+                // Queue the buffer for upload.
+                this.QueueCurrentBufferForUploadAndSetNewBuffer();
+            }
+        }
+        finally
+        {
+            // Always transition back to the idle state.
+            this.currentState.EnterIdleState();
+        }
+    }
+
+    public static int Main()
+    {
+        Program p = new Program();
+        if (p.currentState.IsIdle)
+        {
+            Console.WriteLine("Failed! - 102");
+            return 102;
+        }
+
+        p.Test();
+
+        if (p.currentState.IsIdle)
+        {
+            Console.WriteLine("Passed!");
+            return 100;
+        }
+        else
+        {
+            Console.WriteLine("Failed! - 101");
+            return 101;
+        }
+    }
+}

diff --git a/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.csproj b/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.csproj
new file mode 100644 (file)
index 0000000..95aba99
--- /dev/null
+++ b/src/coreclr/tests/src/JIT/Regression/JitBlue/GitHub_18887/GitHub_18887.csproj
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <AssemblyName>$(MSBuildProjectName)</AssemblyName>
+    <SchemaVersion>2.0</SchemaVersion>
+    <ProjectGuid>{95DFC527-4DC1-495E-97D7-E94EE1F7140D}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <SolutionDir Condition="$(SolutionDir) == '' Or $(SolutionDir) == '*Undefined*'">..\..\</SolutionDir>
+  </PropertyGroup>
+  <!-- Default configurations to help VS understand the configurations -->
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "></PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "></PropertyGroup>
+  <ItemGroup>
+    <CodeAnalysisDependentAssemblyPaths Condition=" '$(VS100COMNTOOLS)' != '' " Include="$(VS100COMNTOOLS)..\IDE\PrivateAssemblies">
+      <Visible>False</Visible>
+    </CodeAnalysisDependentAssemblyPaths>
+  </ItemGroup>
+  <PropertyGroup>
+    <DebugType></DebugType>
+    <Optimize>True</Optimize>
+  </PropertyGroup>
+  <ItemGroup>
+    <Compile Include="$(MSBuildProjectName).cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
+  </ItemGroup>
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.targets))\dir.targets" />
+  <PropertyGroup Condition=" '$(MsBuildProjectDirOverride)' != '' "></PropertyGroup>
+</Project>