This reverts commit 2e756e7412,
which addressed the data race only for test/integration/apiserver/oidc.
It also occurs for test/integration/controlplane/transformation:
WARNING: DATA RACE
Read at 0x000008b9de38 by goroutine 104616:
k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds.RegisterFlags()
/home/prow/go/src/k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds/admission.go:42 +0x30
k8s.io/kubernetes/pkg/kubeapiserver/options.registerAllAdmissionPluginFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/kubeapiserver/options/plugins.go:115 +0x64
k8s.io/kubernetes/pkg/kubeapiserver/options.(*AdmissionOptions).AddFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/kubeapiserver/options/admission.go:73 +0x55
k8s.io/kubernetes/pkg/controlplane/apiserver/options.(*Options).AddFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/controlplane/apiserver/options/options.go:154 +0x388
k8s.io/kubernetes/cmd/kube-apiserver/app/options.(*ServerRunOptions).Flags()
/home/prow/go/src/k8s.io/kubernetes/cmd/kube-apiserver/app/options/options.go:101 +0x73
k8s.io/kubernetes/cmd/kube-apiserver/app/testing.StartTestServer()
/home/prow/go/src/k8s.io/kubernetes/cmd/kube-apiserver/app/testing/testserver.go:219 +0xb77
k8s.io/kubernetes/test/integration/controlplane/transformation.newTransformTest()
/home/prow/go/src/k8s.io/kubernetes/test/integration/controlplane/transformation/transformation_test.go:131 +0x6d0
k8s.io/kubernetes/test/integration/controlplane/transformation.TestKMSv2Healthz()
/home/prow/go/src/k8s.io/kubernetes/test/integration/controlplane/transformation/kmsv2_transformation_test.go:874 +0x1c8
testing.tRunner()
/usr/local/go/src/testing/testing.go:1792 +0x225
testing.(*T).Run.gowrap1()
/usr/local/go/src/testing/testing.go:1851 +0x44
Previous write at 0x000008b9de38 by goroutine 111926:
github.com/spf13/pflag.newInt64Value()
/home/prow/go/src/k8s.io/kubernetes/vendor/github.com/spf13/pflag/int64.go:9 +0x49
github.com/spf13/pflag.(*FlagSet).Int64Var()
/home/prow/go/src/k8s.io/kubernetes/vendor/github.com/spf13/pflag/int64.go:41 +0x3d
k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds.RegisterFlags()
/home/prow/go/src/k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds/admission.go:42 +0x25
k8s.io/kubernetes/pkg/kubeapiserver/options.registerAllAdmissionPluginFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/kubeapiserver/options/plugins.go:115 +0x64
k8s.io/kubernetes/pkg/kubeapiserver/options.(*AdmissionOptions).AddFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/kubeapiserver/options/admission.go:73 +0x55
k8s.io/kubernetes/pkg/controlplane/apiserver/options.(*Options).AddFlags()
/home/prow/go/src/k8s.io/kubernetes/pkg/controlplane/apiserver/options/options.go:154 +0x388
k8s.io/kubernetes/cmd/kube-apiserver/app/options.(*ServerRunOptions).Flags()
/home/prow/go/src/k8s.io/kubernetes/cmd/kube-apiserver/app/options/options.go:101 +0x73
k8s.io/kubernetes/cmd/kube-apiserver/app/testing.StartTestServer()
/home/prow/go/src/k8s.io/kubernetes/cmd/kube-apiserver/app/testing/testserver.go:219 +0xb77
k8s.io/kubernetes/test/integration/controlplane/transformation.newTransformTest()
/home/prow/go/src/k8s.io/kubernetes/test/integration/controlplane/transformation/transformation_test.go:131 +0x6d0
k8s.io/kubernetes/test/integration/controlplane/transformation.TestKMSv2FeatureFlag()
/home/prow/go/src/k8s.io/kubernetes/test/integration/controlplane/transformation/kmsv2_transformation_test.go:1009 +0x117
testing.tRunner()
/usr/local/go/src/testing/testing.go:1792 +0x225
testing.(*T).Run.gowrap1()
/usr/local/go/src/testing/testing.go:1851 +0x44
A more general solution is to lock while registering the variables (= write)
and while reading the variables once in InspectFeatureGates.