kubernetes-cn/kubernetes: test/e2e/scalability/load.go; 139 LoC

Found a possible issue in [kubernetes-cn/kubernetes](https://www.github.com/kubernetes-cn/kubernetes) at [test/e2e/scalability/load.go](https://github.com/kubernetes-cn/kubernetes/blob/c3bec0bae43b4c46800a13f44534ce6cd14b5f40/test/e2e/scalability/load.go#L202-L340)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

>

[Click here to see the code in its original context.](https://github.com/kubernetes-cn/kubernetes/blob/c3bec0bae43b4c46800a13f44534ce6cd14b5f40/test/e2e/scalability/load.go#L202-L340)

Click here to show the 139 line(s) of Go which triggered the analyzer.

```go
for _, testArg := range loadTests {
feature := "ManualPerformance"
if isCanonical(&testArg) {
feature = "Performance"
}
name := fmt.Sprintf("[Feature:%s] should be able to handle %v pods per node %v with %v secrets, %v configmaps and %v daemons",
feature,
testArg.podsPerNode,
testArg.kind,
testArg.secretsPerPod,
testArg.configMapsPerPod,
testArg.daemonsPerNode,
)
if testArg.quotas {
name += " with quotas"
}
itArg := testArg
itArg.services = os.Getenv("CREATE_SERVICES") != "false"

It(name, func() {
// Create a number of namespaces.
namespaceCount := (nodeCount + nodeCountPerNamespace - 1) / nodeCountPerNamespace
namespaces, err := CreateNamespaces(f, namespaceCount, fmt.Sprintf("load-%v-nodepods", itArg.podsPerNode), testPhaseDurations.StartPhase(110, "namespace creation"))
framework.ExpectNoError(err)

totalPods := (itArg.podsPerNode - itArg.daemonsPerNode) * nodeCount
configs, secretConfigs, configMapConfigs = generateConfigs(totalPods, itArg.image, itArg.command, namespaces, itArg.kind, itArg.secretsPerPod, itArg.configMapsPerPod)

if itArg.quotas {
framework.ExpectNoError(CreateQuotas(f, namespaces, 2*totalPods, testPhaseDurations.StartPhase(115, "quota creation")))
}

f.AddonResourceConstraints = loadResourceConstraints()

serviceCreationPhase := testPhaseDurations.StartPhase(120, "services creation")
defer serviceCreationPhase.End()
if itArg.services {
framework.Logf("Creating services")
services := generateServicesForConfigs(configs)
createService := func(i int) {
defer GinkgoRecover()
framework.ExpectNoError(testutils.CreateServiceWithRetries(clientset, services[i].Namespace, services[i]))
}
workqueue.ParallelizeUntil(context.TODO(), serviceOperationsParallelism, len(services), createService)
framework.Logf("%v Services created.", len(services))
defer func(services []*v1.Service) {
serviceCleanupPhase := testPhaseDurations.StartPhase(800, "services deletion")
defer serviceCleanupPhase.End()
framework.Logf("Starting to delete services...")
deleteService := func(i int) {
defer GinkgoRecover()
framework.ExpectNoError(testutils.DeleteResourceWithRetries(clientset, api.Kind("Service"), services[i].Namespace, services[i].Name, nil))
}
workqueue.ParallelizeUntil(context.TODO(), serviceOperationsParallelism, len(services), deleteService)
framework.Logf("Services deleted")
}(services)
} else {
framework.Logf("Skipping service creation")
}
serviceCreationPhase.End()
// Create all secrets.
secretsCreationPhase := testPhaseDurations.StartPhase(130, "secrets creation")
defer secretsCreationPhase.End()
for i := range secretConfigs {
secretConfigs[i].Run()
defer secretConfigs[i].Stop()
}
secretsCreationPhase.End()
// Create all configmaps.
configMapsCreationPhase := testPhaseDurations.StartPhase(140, "configmaps creation")
defer configMapsCreationPhase.End()
for i := range configMapConfigs {
configMapConfigs[i].Run()
defer configMapConfigs[i].Stop()
}
configMapsCreationPhase.End()
// StartDaemon if needed
daemonSetCreationPhase := testPhaseDurations.StartPhase(150, "daemonsets creation")
defer daemonSetCreationPhase.End()
for i := 0; i < itArg.daemonsPerNode; i++ {
daemonName := fmt.Sprintf("load-daemon-%v", i)
daemonConfig := &testutils.DaemonConfig{
Client: f.ClientSet,
Name: daemonName,
Namespace: f.Namespace.Name,
LogFunc: framework.Logf,
}
daemonConfig.Run()
defer func(config *testutils.DaemonConfig) {
framework.ExpectNoError(framework.DeleteResourceAndWaitForGC(
f.ClientSet,
extensions.Kind("DaemonSet"),
config.Namespace,
config.Name,
))
}(daemonConfig)
}
daemonSetCreationPhase.End()

// Simulate lifetime of RC:
// * create with initial size
// * scale RC to a random size and list all pods
// * scale RC to a random size and list all pods
// * delete it
//
// This will generate ~5 creations/deletions per second assuming:
// - X small RCs each 5 pods [ 5 * X = totalPods / 2 ]
// - Y medium RCs each 30 pods [ 30 * Y = totalPods / 4 ]
// - Z big RCs each 250 pods [ 250 * Z = totalPods / 4]

// We would like to spread creating replication controllers over time
// to make it possible to create/schedule them in the meantime.
// Currently we assume pods/second average throughput.
// We may want to revisit it in the future.
framework.Logf("Starting to create %v objects...", itArg.kind)
creatingTime := time.Duration(totalPods/throughput) * time.Second

createAllResources(configs, creatingTime, testPhaseDurations.StartPhase(200, "load pods creation"))
By("============================================================================")

// We would like to spread scaling replication controllers over time
// to make it possible to create/schedule & delete them in the meantime.
// Currently we assume that pods/second average throughput.

// The expected number of created/deleted pods is totalPods/4 when scaling,
// as each RC changes its size from X to a uniform random value in [X/2, 3X/2].
scalingTime := time.Duration(totalPods/(4*throughput)) * time.Second
framework.Logf("Starting to scale %v objects first time...", itArg.kind)
scaleAllResources(configs, scalingTime, testPhaseDurations.StartPhase(300, "scaling first time"))
By("============================================================================")

// Cleanup all created replication controllers.
// Currently we assume pods/second average deletion throughput.
// We may want to revisit it in the future.
deletingTime := time.Duration(totalPods/throughput) * time.Second
framework.Logf("Starting to delete %v objects...", itArg.kind)
deleteAllResources(configs, deletingTime, testPhaseDurations.StartPhase(500, "load pods deletion"))
})
}

```

Click here to show extra information the analyzer produced.

```
No path was found through the callgraph that could lead to a function which writes a pointer argument.

No path was found through the callgraph that could lead to a function which passes a pointer to third-party code.

root signature {isCanonical 1} was not found in the callgraph; reference was passed directly to third-party code
```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: c3bec0bae43b4c46800a13f44534ce6cd14b5f40

Inizia da test/e2e/scalability/load.go alle righe 202-340 e esamina il ciclo range, la chiamata a isCanonical e l’output dell’analizzatore nell’issue. Verifica se un riferimento acquisito può fuoriuscire attraverso la configurazione di test mostrata e gli helper correlati; il lavoro è completo quando viene confermato e corretto un problema reale, oppure viene documentato il motivo per cui il pattern segnalato è sicuro, con un’adeguata validazione nei test e2e di scalabilità.

Scritto dal modello di indicizzazione a partire dal testo della issue.