Removed Native Crash - unable to make it work reliably and it doesn't add much value over FailFast.

Increased log container height and input width to accommodate longer messages and prevent overflow.

Author: rhamlett_microsoft

src/PerfProblemSimulator/Models/CrashRequest.cs

@@ -84,12 +84,5 @@ public enum CrashType
     /// Allocates memory until the process runs out and crashes.
     /// Different from memory pressure - this is meant to be fatal.
     /// </summary>
-    OutOfMemory = 4,
-
-    /// <summary>
-    /// Uses RtlFailFast to trigger an unbypassable native crash.
-    /// This bypasses all .NET and ANCM exception handlers and guarantees
-    /// a Windows Error Report is generated. Best option for Azure Crash Monitoring.
-    /// </summary>
-    NativeCrash = 5
+    OutOfMemory = 4
 }

src/PerfProblemSimulator/Services/CrashService.cs

@@ -117,10 +117,6 @@ private void ExecuteCrash(CrashType crashType, string message)
                 ExecuteOutOfMemory();
                 break;
 
-            case CrashType.NativeCrash:
-                ExecuteNativeCrash();
-                break;
-
             default:
                 throw new ArgumentOutOfRangeException(nameof(crashType), crashType, "Unknown crash type");
         }
@@ -236,37 +232,6 @@ private void ExecuteAccessViolation()
     [DllImport("kernel32.dll", SetLastError = true)]
     private static extern void RaiseException(uint dwExceptionCode, uint dwExceptionFlags, uint nNumberOfArguments, IntPtr lpArguments);
 
-    /// <summary>
-    /// Uses RtlFailFast to trigger an unbypassable crash that guarantees WER capture.
-    /// </summary>
-    /// <remarks>
-    /// <para>
-    /// <strong>Educational Note:</strong> RtlFailFast (the underlying implementation of __fastfail)
-    /// is the nuclear option for crash generation. It:
-    /// </para>
-    /// <list type="bullet">
-    /// <item>Bypasses ALL exception handlers (including ANCM in IIS InProcess mode)</item>
-    /// <item>Generates a Windows Error Report that Crash Monitoring can capture</item>
-    /// <item>Cannot be caught, filtered, or intercepted by any managed or unmanaged code</item>
-    /// <item>Is what the CLR itself uses for internal fatal errors</item>
-    /// </list>
-    /// <para>
-    /// Use this crash type if other crash types are not being captured by Azure Crash Monitoring.
-    /// The error code 7 (FAST_FAIL_FATAL_APP_EXIT) is specifically designed for application crashes.
-    /// </para>
-    /// </remarks>
-    private void ExecuteNativeCrash()
-    {
-        _logger.LogCritical("Triggering native crash via RaiseException (FAIL_FAST_EXCEPTION)!");
-        
-        // Use RaiseException with FAIL_FAST_EXCEPTION code (0xC0000409)
-        // This is the same exception code used by __fastfail and is reliably captured
-        // by Windows Error Reporting and Azure Crash Monitoring
-        const uint STATUS_STACK_BUFFER_OVERRUN = 0xC0000409; // __fastfail exception code
-        const uint EXCEPTION_NONCONTINUABLE = 0x1;
-        RaiseException(STATUS_STACK_BUFFER_OVERRUN, EXCEPTION_NONCONTINUABLE, 0, IntPtr.Zero);
-    }
-
     /// <summary>
     /// Allocates memory until the process runs out and crashes.
     /// </summary>
@@ -346,8 +311,7 @@ public Dictionary<CrashType, string> GetCrashTypeDescriptions()
             [CrashType.StackOverflow] = "Triggers StackOverflowException via infinite recursion. Cannot be caught. Creates interesting stack traces for analysis.",
             [CrashType.UnhandledException] = "Throws an unhandled exception on a background thread, demonstrating the importance of proper exception handling.",
             [CrashType.AccessViolation] = "Writes to invalid memory (null pointer). Demonstrates native-level crashes common in P/Invoke or unsafe code bugs.",
-            [CrashType.OutOfMemory] = "Allocates memory until the process crashes. Useful for learning memory dump analysis techniques.",
-            [CrashType.NativeCrash] = "Uses RtlFailFast to bypass ALL exception handlers including ANCM. Guarantees WER capture - use this if other types aren't detected by Azure Crash Monitoring."
+            [CrashType.OutOfMemory] = "Allocates memory until the process crashes. Useful for learning memory dump analysis techniques."
         };
     }
 }

src/PerfProblemSimulator/wwwroot/documentation.html

@@ -580,11 +580,6 @@ <h3>Available Crash Types</h3>
                         <td>Allocates memory until the process crashes</td>
                         <td>Memory dump analysis</td>
                     </tr>
-                    <tr>
-                        <td><strong>NativeCrash</strong></td>
-                        <td>Uses <code>RtlFailFast</code> to bypass ALL exception handlers including ANCM</td>
-                        <td><strong>Best for Azure Crash Monitoring</strong> - guaranteed WER capture</td>
-                    </tr>
                 </tbody>
             </table>
 
@@ -840,7 +835,7 @@ <h3>Crash Simulation</h3>
   <span class="string">"message"</span>: <span class="string">"Optional crash message"</span>
 }
             </div>
-            <p><strong>Available crash types:</strong> <code>NativeCrash</code> (recommended), <code>FailFast</code>, <code>StackOverflow</code>, <code>UnhandledException</code>, <code>AccessViolation</code>, <code>OutOfMemory</code></p>
+            <p><strong>Available crash types:</strong> <code>FailFast</code> (recommended), <code>AccessViolation</code>, <code>StackOverflow</code>, <code>UnhandledException</code>, <code>OutOfMemory</code></p>
         </section>
 
         <!-- Configuration Section -->

src/PerfProblemSimulator/wwwroot/index.html

@@ -109,11 +109,10 @@ <h3>💥 Application Crash</h3>
                 <div class="control-inputs">
                     <label>Type:
                         <select id="crashType" class="wide-input">
-                            <option value="NativeCrash">Native Crash (Best)</option>
                             <option value="FailFast">FailFast</option>
+                            <option value="AccessViolation">Access Violation</option>
                             <option value="StackOverflow">Stack Overflow</option>
                             <option value="UnhandledException">Unhandled Exception</option>
-                            <option value="AccessViolation">Access Violation</option>
                             <option value="OutOfMemory">Out of Memory</option>
                         </select>
                     </label>