[Tests] Add more logging for runtime test timeouts (dotnet#109998)

* Add more logs

* Flush writers and format active process listing

* Temporarily force timeout

* Revert "Temporarily force timeout"

This reverts commit 9a775c2.

Author: mdh1418

src/tests/Common/Coreclr.TestWrapper/CoreclrTestWrapperLib.cs

@@ -642,6 +642,8 @@ public static bool TryPrintStackTraceFromDmp(string dmpFile, TextWriter outputWr
         // The children are sorted in the order they should be dumped
         static unsafe IEnumerable<Process> FindChildProcessesByName(Process process, string childName)
         {
+            Console.WriteLine($"Finding all child processes of '{process.ProcessName}' (ID: {process.Id}) with name '{childName}'");
+
             var children = new Stack<Process>();
             Queue<Process> childrenToCheck = new Queue<Process>();
             HashSet<int> seen = new HashSet<int>();
@@ -656,6 +658,7 @@ static unsafe IEnumerable<Process> FindChildProcessesByName(Process process, str
                 if (seen.Contains(child.Id))
                     continue;
 
+                Console.WriteLine($"Checking child process: '{child.ProcessName}' (ID: {child.Id})");
                 seen.Add(child.Id);
 
                 foreach (var grandchild in child.GetChildren())
@@ -784,9 +787,19 @@ public int RunTest(string executable, string outputFile, string errorFile, strin
                         outputWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}{2}{3}, start: {4}, end: {5})",
                                 executable, timeout, (environmentVar != null) ? " from variable " : "", (environmentVar != null) ? TIMEOUT_ENVIRONMENT_VAR : "",
                                 startTime.ToString(), endTime.ToString());
+                        outputWriter.Flush();
                         errorWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}{2}{3}, start: {4}, end: {5})",
                                 executable, timeout, (environmentVar != null) ? " from variable " : "", (environmentVar != null) ? TIMEOUT_ENVIRONMENT_VAR : "",
                                 startTime.ToString(), endTime.ToString());
+                        errorWriter.Flush();
+
+                        Console.WriteLine("Collecting diagnostic information...");
+                        Console.WriteLine("Snapshot of processes currently running:");
+                        Console.WriteLine($"\t{"ID",-6} ProcessName");
+                        foreach (var activeProcess in Process.GetProcesses())
+                        {
+                            Console.WriteLine($"\t{activeProcess.Id,-6} {activeProcess.ProcessName}");
+                        }
 
                         if (collectCrashDumps)
                         {

src/tests/Loader/binding/tracing/BinderTracingTest.cs

@@ -189,7 +189,8 @@ private static bool RunSingleTest(MethodInfo method)
 
         private static bool RunTestInSeparateProcess(MethodInfo method)
         {
-            var startInfo = new ProcessStartInfo(Process.GetCurrentProcess().MainModule.FileName, new[] { Assembly.GetExecutingAssembly().Location, method.Name })
+            string subprocessName = Process.GetCurrentProcess().MainModule.FileName;
+            var startInfo = new ProcessStartInfo(subprocessName, new[] { Assembly.GetExecutingAssembly().Location, method.Name })
             {
                 UseShellExecute = false,
                 RedirectStandardOutput = true,
@@ -199,7 +200,7 @@ private static bool RunTestInSeparateProcess(MethodInfo method)
             Console.WriteLine($"[{DateTime.Now:T}] Launching process for {method.Name}...");
             using (Process p = Process.Start(startInfo))
             {
-                Console.WriteLine($"Started subprocess {p.Id} for {method.Name}...");
+                Console.WriteLine($"Started subprocess '{subprocessName}' with PID {p.Id} for {method.Name}...");
                 p.OutputDataReceived += (_, args) => Console.WriteLine(args.Data);
                 p.BeginOutputReadLine();