diff --git a/core/includes/file.inc b/core/includes/file.inc
index b38cf14..d8a0e2b 100644
--- a/core/includes/file.inc
+++ b/core/includes/file.inc
@@ -1436,10 +1436,10 @@ function drupal_mkdir($uri, $mode = NULL, $recursive = FALSE, $context = NULL) {
  */
 function _drupal_mkdir_call($uri, $mode, $recursive, $context) {
   if (is_null($context)) {
-    return mkdir($uri, $mode, $recursive);
+    return @mkdir($uri, $mode, $recursive);
   }
   else {
-    return mkdir($uri, $mode, $recursive, $context);
+    return @mkdir($uri, $mode, $recursive, $context);
   }
 }
 
diff --git a/core/modules/system/src/Tests/File/DirectoryTest.php b/core/modules/system/src/Tests/File/DirectoryTest.php
index 158be71..f4cfedf 100644
--- a/core/modules/system/src/Tests/File/DirectoryTest.php
+++ b/core/modules/system/src/Tests/File/DirectoryTest.php
@@ -49,6 +49,13 @@ function testFileCheckLocalDirectoryHandling() {
     $absolute_path = drupal_realpath($directory) . DIRECTORY_SEPARATOR . $this->randomMachineName() . DIRECTORY_SEPARATOR . $this->randomMachineName();
     $this->assertTrue(drupal_mkdir($absolute_path, 0775, TRUE), 'No error reported when creating new absolute directories.', 'File');
     $this->assertDirectoryPermissions($absolute_path, 0775);
+
+    // Check that trying to create a new directory whose parent is not writable
+    // fails, but with no PHP error.
+    // Make parent directory read only.
+    @drupal_chmod($parent_path, 0444);
+    $second_child_path = $parent_path . DIRECTORY_SEPARATOR . $this->randomMachineName();
+    $this->assertFalse(drupal_mkdir($second_child_path, 0775, TRUE), t('Creating child directory under a non writable parent fails.'), 'File');
   }
 
   /**