core/mount/manager: fix bind mount missing rbind option

ticpu · k8s-infra-cherrypick-robot · commit 1d79082735d4 · 2026-01-28T03:35:55.000Z
The bind mount created for temporary activations was missing the Options field, causing mount to fail with "no such device" because the MS_BIND flag wasn't being set. Fixes #12549 Signed-off-by: Jérôme Poulin <jeromepoulin@gmail.com>
diff --git a/core/mount/manager/manager.go b/core/mount/manager/manager.go
@@ -430,9 +430,9 @@ func (mm *mountManager) Activate(ctx context.Context, name string, mounts []moun
 	// TODO: Add config for whether to add the bind mount?
 	if config.Temporary && firstSystemMount > 0 {
 		mounts = append(mounts, mount.Mount{
-			Type:   "bind",
-			Source: mounted[firstSystemMount-1].MountPoint,
-			// TODO : Configurable bind mount options?
+			Type:    "bind",
+			Source:  mounted[firstSystemMount-1].MountPoint,
+			Options: []string{"rbind"},
 		})
 	}
 
