refresh probed plugins on init to avoid probe race/erroneous unmounts

Signed-off-by: Olga Shestopalova <[email protected]>

Author: olyazavr

pkg/volume/plugins.go

@@ -605,6 +605,7 @@ func (pm *VolumePluginMgr) InitPlugins(plugins []VolumePlugin, prober DynamicPlu
 		pm.plugins[name] = plugin
 		klog.V(1).InfoS("Loaded volume plugin", "pluginName", name)
 	}
+	pm.refreshProbedPlugins()
 	return utilerrors.NewAggregate(allErrs)
 }
 

pkg/volume/plugins_test.go

@@ -17,11 +17,16 @@ limitations under the License.
 package volume
 
 import (
+	"sync"
+	"sync/atomic"
 	"testing"
 
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/types"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const testPluginName = "kubernetes.io/testPlugin"
@@ -165,3 +170,63 @@ func Test_ValidatePodTemplate(t *testing.T) {
 		t.Errorf("isPodTemplateValid(%v) returned (%v), want (%v)", pod.String(), got, "Error: pod specification does not contain any volume(s).")
 	}
 }
+
+// TestVolumePluginMultiThreaded tests FindPluginByName/FindPluginBySpec in a multi-threaded environment.
+// If these are called by different threads at the same time, they should still be able to reconcile the plugins
+// and return the same results (no missing plugin)
+func TestVolumePluginMultiThreaded(t *testing.T) {
+	vpm := VolumePluginMgr{}
+	var prober DynamicPluginProber = &fakeProber{events: []ProbeEvent{{PluginName: testPluginName, Op: ProbeAddOrUpdate, Plugin: &testPlugins{}}}}
+	err := vpm.InitPlugins([]VolumePlugin{}, prober, nil)
+	require.NoError(t, err)
+
+	volumeSpec := &Spec{}
+	totalErrors := atomic.Int32{}
+	var wg sync.WaitGroup
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			_, err := vpm.FindPluginByName(testPluginName)
+			if err != nil {
+				totalErrors.Add(1)
+			}
+		}()
+	}
+	wg.Wait()
+
+	assert.Equal(t, int32(0), totalErrors.Load())
+	totalErrors.Store(0)
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			_, err := vpm.FindPluginBySpec(volumeSpec)
+			if err != nil {
+				totalErrors.Add(1)
+			}
+		}()
+	}
+	wg.Wait()
+
+	assert.Equal(t, int32(0), totalErrors.Load())
+}
+
+type fakeProber struct {
+	events         []ProbeEvent
+	firstExecution atomic.Bool
+}
+
+func (prober *fakeProber) Init() error {
+	prober.firstExecution.Store(true)
+	return nil
+}
+
+func (prober *fakeProber) Probe() (events []ProbeEvent, err error) {
+	if prober.firstExecution.CompareAndSwap(true, false) {
+		return prober.events, nil
+	}
+	return []ProbeEvent{}, nil
+}