use wait to avoid blocking the SIGTERM handler

test/e2e_node/deleted_pods_test.go

@@ -155,12 +155,17 @@ var _ = SIGDescribe("Deleted pods handling [NodeConformance]", func() {
 							Image:   imageutils.GetE2EImage(imageutils.BusyBox),
 							Command: []string{"sh", "-c"},
 							Args: []string{`
+							sleep 9999999 &
+							PID=$!
 							_term() {
+								kill $PID
 								echo "Caught SIGTERM signal!"
-								exit 0
 							}
+
 							trap _term SIGTERM
-							while true; do sleep 5; done
+							wait $PID
+
+							exit 0
 							`,
 							},
 						},

test/e2e_node/node_shutdown_linux_test.go

@@ -560,6 +560,11 @@ func getPriorityClass(name string, value int32) *schedulingv1.PriorityClass {
 	}
 	return priority
 }
+
+// getGracePeriodOverrideTestPod returns a new Pod object containing a container
+// runs a shell script, hangs the process until a SIGTERM signal is received.
+// The script waits for $PID to ensure that the process does not exist.
+// If priorityClassName is scheduling.SystemNodeCritical, the Pod is marked as critical and a comment is added.
 func getGracePeriodOverrideTestPod(name string, node string, gracePeriod int64, priorityClassName string) *v1.Pod {
 	pod := &v1.Pod{
 		TypeMeta: metav1.TypeMeta{
@@ -576,12 +581,15 @@ func getGracePeriodOverrideTestPod(name string, node string, gracePeriod int64,
 					Image:   busyboxImage,
 					Command: []string{"sh", "-c"},
 					Args: []string{`
+					sleep 9999999 &
+					PID=$!
 					_term() {
 						echo "Caught SIGTERM signal!"
-	while true; do sleep 5; done
+						wait $PID
 					}
+					
 					trap _term SIGTERM
-while true; do sleep 5; done
+					wait $PID
 					`},
 				},
 			},