fix: Fix a segfault when using sendDataOnExit with Linux on Docker.

src/Agent/NewRelic/Agent/Core/AgentManager.cs

@@ -28,6 +28,7 @@ sealed public class AgentManager : IAgentManager, IDisposable
         private readonly ConfigurationSubscriber _configurationSubscription = new ConfigurationSubscriber();
         private readonly static IAgentManager DisabledAgentManager = new DisabledAgentManager();
         private readonly static AgentSingleton Singleton = new AgentSingleton();
+        private bool _connected = false;
 
         private sealed class AgentSingleton : Singleton<IAgentManager>
         {
@@ -121,6 +122,8 @@ private AgentManager()
             AssertAgentEnabled(config);
 
             EventBus<KillAgentEvent>.Subscribe(OnShutdownAgent);
+            EventBus<AgentConnectedEvent>.Subscribe(OnAgentConnected);
+            EventBus<StopHarvestEvent>.Subscribe(OnAgentReconnecting);
 
             //Initialize the extensions loader with extensions folder based on the the install path
             ExtensionsLoader.Initialize(AgentInstallConfiguration.InstallPathExtensionsDirectory);
@@ -349,8 +352,8 @@ public ITracer GetTracerImpl(string tracerFactoryName, uint tracerArguments, str
         private void ProcessExit(object sender, EventArgs e)
         {
             Log.Debug("Received a ProcessExit CLR event for the application domain. About to shut down the .NET Agent...");
-            
-            Shutdown(true);
+
+            Shutdown(_connected);
         }
 
         private void Shutdown(bool cleanShutdown)
@@ -370,6 +373,7 @@ private void Shutdown(bool cleanShutdown)
 
                 if (cleanShutdown)
                 {
+                    Log.Debug("Agent is connected, executing a clean shutdown.");
                     EventBus<PreCleanShutdownEvent>.Publish(new PreCleanShutdownEvent());
                     EventBus<CleanShutdownEvent>.Publish(new CleanShutdownEvent());
                 }
@@ -408,6 +412,20 @@ private void OnShutdownAgent(KillAgentEvent eventData)
             if (_isInitialized) Shutdown(false);
         }
 
+        // Automatically triggered once the agent is fully connected.
+        private void OnAgentConnected(AgentConnectedEvent _)
+        {
+            _connected = true;
+        }
+
+        // This event is only triggered during a reconnect.
+        // We want to mark the agent as disconnected until the reconnect (which is just a Connect) is completed.
+        // Once the reconnect(Connect) is done, it will automatically trigger AgentConnectedEvent (OnAgentConnected) above.
+        private void OnAgentReconnecting(StopHarvestEvent _)
+        {
+            _connected = false;
+        }
+
         #endregion Event handlers
     }
 }

tests/Agent/IntegrationTests/Applications/ApiAppNameChange/Program.cs

@@ -7,6 +7,7 @@
 using System.IO;
 using System.Reflection;
 using System.Threading;
+using System.Threading.Tasks;
 using CommandLine;
 
 namespace NewRelic.Agent.IntegrationTests.Applications.ApiAppNameChange
@@ -37,6 +38,9 @@ static void Main(string[] args)
                 Api.Agent.NewRelic.StartAgent();
                 Api.Agent.NewRelic.SetApplicationName("AgentApi2");
 
+                // We need to wait for the reconnect to occur before the new name is picked up.
+                Task.Delay(30 * 1000).Wait();
+
                 // Wait for the test harness to tell us to shut down
                 eventWaitHandle.WaitOne(TimeSpan.FromMinutes(5));
             }

tests/Agent/IntegrationTests/SharedApplications/Common/MultiFunctionApplicationHelpers/MultiFunctionApplicationHelpers.csproj

@@ -6,6 +6,7 @@
     <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
     <DisableImplicitNamespaceImports>true</DisableImplicitNamespaceImports>
     <LangVersion>default</LangVersion>
+    <NuGetAudit>false</NuGetAudit>
   </PropertyGroup>
 
   <ItemGroup>