Add delay to avoid race conditions during VolumeSnapshotContent deletion (velero-io#9700)

* Add delay to avoid race conditions during VolumeSnapshotContent deletion
Signed-off-by: Priyansh Choudhary <im1706@gmail.com>

* updated changelog
Signed-off-by: Priyansh Choudhary <im1706@gmail.com>

* Updated Changelog
Signed-off-by: Priyansh Choudhary <im1706@gmail.com>

Author: priyansh17

changelogs/unreleased/9700-priyansh17

@@ -0,0 +1 @@
+Fix issue #9699, add a 2-second gap between temporary CSI VolumeSnapshotContent create and delete operations

internal/delete/actions/csi/volumesnapshotcontent_action.go

@@ -18,6 +18,7 @@ package csi
 
 import (
 	"context"
+	"time"
 
 	"github.com/google/uuid"
 	snapshotv1api "github.com/kubernetes-csi/external-snapshotter/client/v7/apis/volumesnapshot/v1"
@@ -40,6 +41,10 @@ type volumeSnapshotContentDeleteItemAction struct {
 	crClient crclient.Client
 }
 
+const tempVSCCreateDeleteGap = 2 * time.Second
+
+var sleepBetweenTempVSCCreateAndDelete = time.Sleep
+
 // AppliesTo returns information indicating
 // VolumeSnapshotContentRestoreItemAction action should be invoked
 // while restoring VolumeSnapshotContent.snapshot.storage.k8s.io resources
@@ -115,6 +120,9 @@ func (p *volumeSnapshotContentDeleteItemAction) Execute(
 	}
 	p.log.Infof("Created temp VolumeSnapshotContent %s with DeletionPolicy=Delete to trigger cloud snapshot cleanup", snapCont.Name)
 
+	// Add a small delay before delete to avoid create/delete race conditions in CSI controllers.
+	sleepBetweenTempVSCCreateAndDelete(tempVSCCreateDeleteGap)
+
 	// Delete the temp VSC immediately to trigger cloud snapshot removal.
 	// The CSI driver will handle the actual cloud snapshot deletion.
 	if err := p.crClient.Delete(

internal/delete/actions/csi/volumesnapshotcontent_action_test.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"fmt"
 	"testing"
+	"time"
 
 	snapshotv1api "github.com/kubernetes-csi/external-snapshotter/client/v7/apis/volumesnapshot/v1"
 	"github.com/sirupsen/logrus"
@@ -46,6 +47,21 @@ type fakeClientWithErrors struct {
 	deleteError error
 }
 
+type fakeClientWithCallTracking struct {
+	crclient.Client
+	events *[]string
+}
+
+func (c *fakeClientWithCallTracking) Create(ctx context.Context, obj crclient.Object, opts ...crclient.CreateOption) error {
+	*c.events = append(*c.events, "create")
+	return c.Client.Create(ctx, obj, opts...)
+}
+
+func (c *fakeClientWithCallTracking) Delete(ctx context.Context, obj crclient.Object, opts ...crclient.DeleteOption) error {
+	*c.events = append(*c.events, "delete")
+	return c.Client.Delete(ctx, obj, opts...)
+}
+
 func (c *fakeClientWithErrors) Get(ctx context.Context, key crclient.ObjectKey, obj crclient.Object, opts ...crclient.GetOption) error {
 	if c.getError != nil {
 		return c.getError
@@ -325,6 +341,39 @@ func TestTryDeleteOriginalVSC(t *testing.T) {
 	})
 }
 
+func TestVSCExecute_CreateSleepDeleteOrder(t *testing.T) {
+	snapshotHandleStr := "test"
+	vsc := builder.ForVolumeSnapshotContent("bar").
+		ObjectMeta(builder.WithLabelsMap(map[string]string{velerov1api.BackupNameLabel: "backup"})).
+		Status(&snapshotv1api.VolumeSnapshotContentStatus{SnapshotHandle: &snapshotHandleStr}).
+		Result()
+
+	vscMap, err := runtime.DefaultUnstructuredConverter.ToUnstructured(vsc)
+	require.NoError(t, err)
+
+	events := make([]string, 0, 3)
+	realClient := velerotest.NewFakeControllerRuntimeClient(t)
+	trackingClient := &fakeClientWithCallTracking{Client: realClient, events: &events}
+
+	originalSleep := sleepBetweenTempVSCCreateAndDelete
+	t.Cleanup(func() {
+		sleepBetweenTempVSCCreateAndDelete = originalSleep
+	})
+
+	sleepBetweenTempVSCCreateAndDelete = func(d time.Duration) {
+		require.Equal(t, tempVSCCreateDeleteGap, d)
+		events = append(events, "sleep")
+	}
+
+	p := volumeSnapshotContentDeleteItemAction{log: logrus.StandardLogger(), crClient: trackingClient}
+	err = p.Execute(&velero.DeleteItemActionExecuteInput{
+		Item:   &unstructured.Unstructured{Object: vscMap},
+		Backup: builder.ForBackup("velero", "backup").Result(),
+	})
+	require.NoError(t, err)
+	require.Equal(t, []string{"create", "sleep", "delete"}, events)
+}
+
 func boolPtr(b bool) *bool {
 	return &b
 }