diff --git a/docs/content/doc/advanced/external-renderers.en-us.md b/docs/content/doc/advanced/external-renderers.en-us.md
index f40c23dd84..244fcd7c83 100644
--- a/docs/content/doc/advanced/external-renderers.en-us.md
+++ b/docs/content/doc/advanced/external-renderers.en-us.md
@@ -192,5 +192,5 @@ And so you could write some CSS:
 Add your stylesheet to your custom directory e.g `custom/public/css/my-style-XXXXX.css` and import it using a custom header file `custom/templates/custom/header.tmpl`:
 
 ```html
-<link type="text/css" href="{{AppSubUrl}}/assets/css/my-style-XXXXX.css" />
+<link rel="stylesheet" href="{{AppSubUrl}}/assets/css/my-style-XXXXX.css" />
 ```
diff --git a/models/fixtures/repository.yml b/models/fixtures/repository.yml
index 19b243fb4e..5d4781ad44 100644
--- a/models/fixtures/repository.yml
+++ b/models/fixtures/repository.yml
@@ -24,7 +24,7 @@
   fork_id: 0
   is_template: false
   template_id: 0
-  size: 0
+  size: 6708
   is_fsck_enabled: true
   close_issues_via_commit_in_any_branch: false
 
diff --git a/models/repo/update.go b/models/repo/update.go
index 3aef280ff8..8dd1097450 100644
--- a/models/repo/update.go
+++ b/models/repo/update.go
@@ -184,7 +184,7 @@ func ChangeRepositoryName(doer *user_model.User, repo *Repository, newRepoName s
 	return committer.Commit()
 }
 
-// UpdateRepoSize updates the repository size, calculating it using util.GetDirectorySize
+// UpdateRepoSize updates the repository size, calculating it using getDirectorySize
 func UpdateRepoSize(ctx context.Context, repoID, size int64) error {
 	_, err := db.GetEngine(ctx).ID(repoID).Cols("size").NoAutoTime().Update(&Repository{
 		Size: size,
diff --git a/modules/markup/external/external.go b/modules/markup/external/external.go
index f47776690f..ffbb6da4da 100644
--- a/modules/markup/external/external.go
+++ b/modules/markup/external/external.go
@@ -4,6 +4,7 @@
 package external
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -132,11 +133,13 @@ func (p *Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.
 	if !p.IsInputFile {
 		cmd.Stdin = input
 	}
+	var stderr bytes.Buffer
 	cmd.Stdout = output
+	cmd.Stderr = &stderr
 	process.SetSysProcAttribute(cmd)
 
 	if err := cmd.Run(); err != nil {
-		return fmt.Errorf("%s render run command %s %v failed: %w", p.Name(), commands[0], args, err)
+		return fmt.Errorf("%s render run command %s %v failed: %w\nStderr: %s", p.Name(), commands[0], args, err, stderr.String())
 	}
 	return nil
 }
diff --git a/modules/repository/create.go b/modules/repository/create.go
index 423250add3..04bc72c269 100644
--- a/modules/repository/create.go
+++ b/modules/repository/create.go
@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
 
 	"code.gitea.io/gitea/models"
@@ -287,9 +288,36 @@ func CreateRepository(doer, u *user_model.User, opts CreateRepoOptions) (*repo_m
 	return repo, nil
 }
 
-// UpdateRepoSize updates the repository size, calculating it using util.GetDirectorySize
+const notRegularFileMode = os.ModeSymlink | os.ModeNamedPipe | os.ModeSocket | os.ModeDevice | os.ModeCharDevice | os.ModeIrregular
+
+// getDirectorySize returns the disk consumption for a given path
+func getDirectorySize(path string) (int64, error) {
+	var size int64
+	err := filepath.WalkDir(path, func(_ string, info os.DirEntry, err error) error {
+		if err != nil {
+			if os.IsNotExist(err) { // ignore the error because the file maybe deleted during traversing.
+				return nil
+			}
+			return err
+		}
+		if info.IsDir() {
+			return nil
+		}
+		f, err := info.Info()
+		if err != nil {
+			return err
+		}
+		if (f.Mode() & notRegularFileMode) == 0 {
+			size += f.Size()
+		}
+		return err
+	})
+	return size, err
+}
+
+// UpdateRepoSize updates the repository size, calculating it using getDirectorySize
 func UpdateRepoSize(ctx context.Context, repo *repo_model.Repository) error {
-	size, err := util.GetDirectorySize(repo.RepoPath())
+	size, err := getDirectorySize(repo.RepoPath())
 	if err != nil {
 		return fmt.Errorf("updateSize: %w", err)
 	}
diff --git a/modules/repository/create_test.go b/modules/repository/create_test.go
index da4a738b64..293071bdce 100644
--- a/modules/repository/create_test.go
+++ b/modules/repository/create_test.go
@@ -168,3 +168,13 @@ func TestUpdateRepositoryVisibilityChanged(t *testing.T) {
 	assert.NoError(t, err)
 	assert.True(t, act.IsPrivate)
 }
+
+func TestGetDirectorySize(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+	repo, err := repo_model.GetRepositoryByID(db.DefaultContext, 1)
+	assert.NoError(t, err)
+
+	size, err := getDirectorySize(repo.RepoPath())
+	assert.NoError(t, err)
+	assert.EqualValues(t, size, repo.Size)
+}
diff --git a/modules/util/path.go b/modules/util/path.go
index 03013f7133..e060b527f3 100644
--- a/modules/util/path.go
+++ b/modules/util/path.go
@@ -22,20 +22,6 @@ func EnsureAbsolutePath(path, absoluteBase string) string {
 	return filepath.Join(absoluteBase, path)
 }
 
-const notRegularFileMode os.FileMode = os.ModeSymlink | os.ModeNamedPipe | os.ModeSocket | os.ModeDevice | os.ModeCharDevice | os.ModeIrregular
-
-// GetDirectorySize returns the disk consumption for a given path
-func GetDirectorySize(path string) (int64, error) {
-	var size int64
-	err := filepath.Walk(path, func(_ string, info os.FileInfo, err error) error {
-		if info != nil && (info.Mode()&notRegularFileMode) == 0 {
-			size += info.Size()
-		}
-		return err
-	})
-	return size, err
-}
-
 // IsDir returns true if given path is a directory,
 // or returns false when it's a file or does not exist.
 func IsDir(dir string) (bool, error) {