Fix Manager.Run stop deadlock

Fix open-telemetry#1218

Close probes in a different goroutine than the one draining their event
channel.

internal/pkg/instrumentation/manager.go

@@ -277,21 +277,30 @@ func (m *Manager) Run(ctx context.Context, target *process.TargetDetails) error
 
 	go m.ConfigLoop(ctx)
 
-	for {
-		select {
-		case <-ctx.Done():
-			m.probeMu.Lock()
+	done := make(chan error, 1)
+	go func() {
+		defer close(done)
+		<-ctx.Done()
+
+		m.probeMu.Lock()
+
+		m.logger.Debug("Shutting down all probes")
+		err := m.cleanup(target)
 
-			m.logger.Debug("Shutting down all probes")
-			err := m.cleanup(target)
+		// Wait for all probes to stop before closing the chan they send on.
+		m.runningProbesWG.Wait()
+		close(m.eventCh)
 
-			// Wait for all probes to stop before closing the chan they send on.
-			m.runningProbesWG.Wait()
-			close(m.eventCh)
+		m.state = managerStateStopped
+		m.probeMu.Unlock()
 
-			m.state = managerStateStopped
-			m.probeMu.Unlock()
-			return errors.Join(err, ctx.Err())
+		done <- errors.Join(err, ctx.Err())
+	}()
+
+	for {
+		select {
+		case err := <-done:
+			return err
 		case e := <-m.eventCh:
 			m.otelController.Trace(e)
 		}