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)

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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:
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commit ID: c3bec0bae43b4c46800a13f44534ce6cd14b5f40