[CWS] make sure we check if the trace pipe is closed before sending (#…

…28075)

pkg/security/tests/trace_pipe.go

@@ -117,9 +117,19 @@ func (t *TracePipe) Channel() (<-chan *TraceEvent, <-chan error) {
 				if err == io.EOF {
 					continue
 				}
-				channelErrors <- err
+				select {
+				case <-t.stop:
+					return
+				case channelErrors <- err:
+					// do nothing
+				}
 			} else {
-				channelEvents <- traceEvent
+				select {
+				case <-t.stop:
+					return
+				case channelEvents <- traceEvent:
+					// do nothing
+				}
 			}
 		}
 	}()