fb

src/Microsoft.AspNetCore.Server.IIS/Core/IISHttpContext.FeatureCollection.cs

@@ -205,6 +205,7 @@ namespace Microsoft.AspNetCore.Server.IIS.Core
                     return null;
                 }
 
+                // Synchronize access to native methods that might run in parallel with IO loops
                 lock (_contextLock)
                 {
                     return NativeMethods.HttpTryGetServerVariable(_pInProcessHandler, variableName, out var value) ? value : null;

src/Microsoft.AspNetCore.Server.IIS/Core/IO/AsyncIOEngine.cs

@@ -26,7 +26,7 @@ namespace Microsoft.AspNetCore.Server.IIS.Core.IO
 
         public AsyncIOEngine(object contextSync, IntPtr handler)
         {
-            this._contextSync = contextSync;
+            _contextSync = contextSync;
             _handler = handler;
         }