diff --git a/pkg/kubelet/container/testing/os.go b/pkg/kubelet/container/testing/os.go
index 6dc59726864..cf84b257689 100644
--- a/pkg/kubelet/container/testing/os.go
+++ b/pkg/kubelet/container/testing/os.go
@@ -19,6 +19,7 @@ package testing
 import (
 	"errors"
 	"os"
+	"sync"
 	"time"
 )
 
@@ -34,6 +35,7 @@ type FakeOS struct {
 	HostName   string
 	Removes    []string
 	Files      map[string][]*os.FileInfo
+	FilesLock  sync.RWMutex
 }
 
 // Mkdir is a fake call that just returns nil.
@@ -53,7 +55,7 @@ func (f *FakeOS) Symlink(oldname string, newname string) error {
 }
 
 // Stat is a fake that returns an error
-func (f FakeOS) Stat(path string) (os.FileInfo, error) {
+func (f *FakeOS) Stat(path string) (os.FileInfo, error) {
 	if f.StatFn != nil {
 		return f.StatFn(path)
 	}
@@ -74,6 +76,8 @@ func (f *FakeOS) RemoveAll(path string) error {
 
 // Create is a fake call that creates a virtual file and returns nil.
 func (f *FakeOS) Create(path string) (*os.File, error) {
+	f.FilesLock.Lock()
+	defer f.FilesLock.Unlock()
 	if f.Files == nil {
 		f.Files = make(map[string][]*os.FileInfo)
 	}
@@ -82,7 +86,7 @@ func (f *FakeOS) Create(path string) (*os.File, error) {
 }
 
 // Chmod is a fake call that returns nil.
-func (FakeOS) Chmod(path string, perm os.FileMode) error {
+func (*FakeOS) Chmod(path string, perm os.FileMode) error {
 	return nil
 }
 
@@ -92,12 +96,12 @@ func (f *FakeOS) Hostname() (name string, err error) {
 }
 
 // Chtimes is a fake call that returns nil.
-func (FakeOS) Chtimes(path string, atime time.Time, mtime time.Time) error {
+func (*FakeOS) Chtimes(path string, atime time.Time, mtime time.Time) error {
 	return nil
 }
 
 // Pipe is a fake call that returns nil.
-func (FakeOS) Pipe() (r *os.File, w *os.File, err error) {
+func (*FakeOS) Pipe() (r *os.File, w *os.File, err error) {
 	return nil, nil, nil
 }
 
@@ -113,6 +117,8 @@ func (f *FakeOS) ReadDir(dirname string) ([]os.DirEntry, error) {
 func (f *FakeOS) Glob(pattern string) ([]string, error) {
 	if f.GlobFn != nil {
 		var res []string
+		f.FilesLock.RLock()
+		defer f.FilesLock.RUnlock()
 		for k := range f.Files {
 			if f.GlobFn(pattern, k) {
 				res = append(res, k)
@@ -124,16 +130,16 @@ func (f *FakeOS) Glob(pattern string) ([]string, error) {
 }
 
 // Open is a fake call that returns nil.
-func (FakeOS) Open(name string) (*os.File, error) {
+func (*FakeOS) Open(name string) (*os.File, error) {
 	return nil, nil
 }
 
 // OpenFile is a fake call that return nil.
-func (FakeOS) OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
+func (*FakeOS) OpenFile(name string, flag int, perm os.FileMode) (*os.File, error) {
 	return nil, nil
 }
 
 // Rename is a fake call that return nil.
-func (FakeOS) Rename(oldpath, newpath string) error {
+func (*FakeOS) Rename(oldpath, newpath string) error {
 	return nil
 }