Instrumentation for #116276

src/libraries/System.Private.CoreLib/src/System/TimeSpan.cs

@@ -889,9 +889,14 @@ public bool TryFormat(Span<byte> utf8Destination, out int bytesWritten, [StringS
             {
                 // Overflow if signs of operands was different and result's sign was opposite.
                 // >> 63 gives the sign bit (either 64 1's or 64 0's).
-                ThrowHelper.ThrowOverflowException_TimeSpanTooLong();
+                ThrowOverflowException_TimeSpanTooLong(t1, t2);
             }
             return new TimeSpan(result);
+
+            static void ThrowOverflowException_TimeSpanTooLong(TimeSpan t1, TimeSpan t2)
+            {
+                throw new OverflowException(t1.ToString() + " " + t2.ToString());
+            }
         }
 
         public static TimeSpan operator +(TimeSpan t) => t;

src/tests/Common/XUnitWrapperGenerator/ITestInfo.cs

@@ -456,8 +456,15 @@ public CodeBuilder WrapTestExecutionWithReporting(CodeBuilder testExecutionExpre
                          + $" || {_filterLocalIdentifier}.ShouldRunTest(@\"{test.ContainingType}.{test.Method}\","
                          + $" {test.TestNameExpression}))");
 
+        bool interestingTest = test.TestNameExpression.Contains("Runtime_108612") || test.TestNameExpression.Contains("b26496");
+
         using (builder.NewBracesScope())
         {
+            if (interestingTest)
+            {
+                builder.AppendLine("for (int abcd = 0; abcd < 100; abcd++) { try {");
+            }
+
             builder.AppendLine($"System.TimeSpan testStart = stopwatch.Elapsed;");
             builder.AppendLine("try");
 
@@ -496,6 +503,11 @@ public CodeBuilder WrapTestExecutionWithReporting(CodeBuilder testExecutionExpre
                                  + $" tempLogSw,"
                                  + $" statsCsvSw);");
             }
+
+            if (interestingTest)
+            {
+                builder.AppendLine("} catch (System.Exception eee) when (FailNow(eee)) { } bool FailNow(Exception eee) { System.Environment.FailFast(\"FailNow\", eee); return true; } }");
+            }
         }
 
         builder.AppendLine("else");