Fix null ref exception in SecretMasker caused by hashfiles timeout. (#516)

src/Misc/dotnet-install.ps1

@@ -684,3 +684,196 @@ Prepend-Sdk-InstallRoot-To-Path -InstallRoot $InstallRoot -BinFolderRelativePath
 
 Say "Installation finished"
 exit 0
+
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+# SIG # End signature block

src/Runner.Sdk/ProcessInvoker.cs

@@ -318,7 +318,12 @@ namespace GitHub.Runner.Sdk
                 }
             }
 
-            using (var registration = cancellationToken.Register(async () => await CancelAndKillProcessTree(killProcessOnCancel)))
+            var cancellationFinished = new TaskCompletionSource<bool>();
+            using (var registration = cancellationToken.Register(async () =>
+            {
+                await CancelAndKillProcessTree(killProcessOnCancel);
+                cancellationFinished.TrySetResult(true);
+            }))
             {
                 Trace.Info($"Process started with process id {_proc.Id}, waiting for process exit.");
                 while (true)
@@ -344,6 +349,13 @@ namespace GitHub.Runner.Sdk
                 Trace.Info($"Finished process {_proc.Id} with exit code {_proc.ExitCode}, and elapsed time {_stopWatch.Elapsed}.");
             }
 
+            if (cancellationToken.IsCancellationRequested)
+            {
+                // Ensure cancellation also finish on the cancellationToken.Register thread.
+                await cancellationFinished.Task;
+                Trace.Info($"Process Cancellation finished.");
+            }
+
             cancellationToken.ThrowIfCancellationRequested();
 
             // Wait for process to finish.

src/Runner.Worker/Expressions/HashFilesFunction.cs

@@ -12,6 +12,8 @@ namespace GitHub.Runner.Worker.Expressions
 {
     public sealed class HashFilesFunction : Function
     {
+        private const int _hashFileTimeoutSeconds = 120;
+
         protected sealed override Object EvaluateCore(
             EvaluationContext context,
             out ResultMemory resultMemory)
@@ -89,19 +91,29 @@ namespace GitHub.Runner.Worker.Expressions
             }
             env["patterns"] = string.Join(Environment.NewLine, patterns);
 
-            int exitCode = p.ExecuteAsync(workingDirectory: githubWorkspace,
-                                          fileName: node,
-                                          arguments: $"\"{hashFilesScript.Replace("\"", "\\\"")}\"",
-                                          environment: env,
-                                          requireExitCodeZero: false,
-                                          cancellationToken: new CancellationTokenSource(TimeSpan.FromSeconds(120)).Token).GetAwaiter().GetResult();
-
-            if (exitCode != 0)
+            using (var tokenSource = new CancellationTokenSource(TimeSpan.FromSeconds(_hashFileTimeoutSeconds)))
             {
-                throw new InvalidOperationException($"hashFiles('{ExpressionUtility.StringEscape(string.Join(", ", patterns))}') failed. Fail to hash files under directory '{githubWorkspace}'");
-            }
+                try
+                {
+                    int exitCode = p.ExecuteAsync(workingDirectory: githubWorkspace,
+                                                  fileName: node,
+                                                  arguments: $"\"{hashFilesScript.Replace("\"", "\\\"")}\"",
+                                                  environment: env,
+                                                  requireExitCodeZero: false,
+                                                  cancellationToken: tokenSource.Token).GetAwaiter().GetResult();
 
-            return hashResult;
+                    if (exitCode != 0)
+                    {
+                        throw new InvalidOperationException($"hashFiles('{ExpressionUtility.StringEscape(string.Join(", ", patterns))}') failed. Fail to hash files under directory '{githubWorkspace}'");
+                    }
+                }
+                catch (OperationCanceledException) when (tokenSource.IsCancellationRequested)
+                {
+                    throw new TimeoutException($"hashFiles('{ExpressionUtility.StringEscape(string.Join(", ", patterns))}') couldn't finish within {_hashFileTimeoutSeconds} seconds.");
+                }
+
+                return hashResult;
+            }
         }
 
         private sealed class HashFilesTrace : ITraceWriter