diff --git a/typo3/sysext/core/Classes/Cache/Backend/SimpleFileBackend.php b/typo3/sysext/core/Classes/Cache/Backend/SimpleFileBackend.php
index cee2d31..d3a4496 100644
--- a/typo3/sysext/core/Classes/Cache/Backend/SimpleFileBackend.php
+++ b/typo3/sysext/core/Classes/Cache/Backend/SimpleFileBackend.php
@@ -10,6 +10,8 @@ namespace TYPO3\CMS\Core\Cache\Backend;
  *                                                                        *
  * The TYPO3 project - inspiring people to share!                         *
  *                                                                        */
+use TYPO3\CMS\Core\Core\Bootstrap;
+
 /**
  * A caching backend which stores cache entries in files, but does not support or
  * care about expiry times and tags.
@@ -87,6 +89,7 @@ class SimpleFileBackend extends \TYPO3\CMS\Core\Cache\Backend\AbstractBackend im
 	 * @return void
 	 */
 	public function setCache(\TYPO3\CMS\Core\Cache\Frontend\FrontendInterface $cache) {
+		error_log(Bootstrap::getInstance()->getRequestId().' setCache');
 		parent::setCache($cache);
 		if (empty($this->temporaryCacheDirectory)) {
 			// If no cache directory was given with cacheDirectory
@@ -192,6 +195,7 @@ class SimpleFileBackend extends \TYPO3\CMS\Core\Cache\Backend\AbstractBackend im
 	 */
 	protected function createFinalCacheDirectory($finalCacheDirectory) {
 		try {
+			error_log(Bootstrap::getInstance()->getRequestId() . ' create ' . $finalCacheDirectory);
 			\TYPO3\CMS\Core\Utility\GeneralUtility::mkdir_deep($finalCacheDirectory);
 		} catch (\RuntimeException $e) {
 			throw new \TYPO3\CMS\Core\Cache\Exception('The directory "' . $finalCacheDirectory . '" can not be created.', 1303669848, $e);
diff --git a/typo3/sysext/core/Classes/Error/ErrorHandler.php b/typo3/sysext/core/Classes/Error/ErrorHandler.php
index 3bca9d1..6ab6881 100644
--- a/typo3/sysext/core/Classes/Error/ErrorHandler.php
+++ b/typo3/sysext/core/Classes/Error/ErrorHandler.php
@@ -23,6 +23,8 @@ namespace TYPO3\CMS\Core\Error;
  *
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
+use TYPO3\CMS\Core\Core\Bootstrap;
+
 /**
  * Global error handler for TYPO3
  *
@@ -105,6 +107,7 @@ class ErrorHandler implements \TYPO3\CMS\Core\Error\ErrorHandlerInterface {
 				require_once PATH_site . 'typo3/sysext/core/Classes/Exception.php';
 				require_once PATH_site . 'typo3/sysext/core/Classes/Error/Exception.php';
 			}
+			error_log(Bootstrap::getInstance()->getRequestId() . ' exception ');
 			throw new \TYPO3\CMS\Core\Error\Exception($message, 1);
 		} else {
 			switch ($errorLevel) {
diff --git a/typo3/sysext/core/Classes/Utility/GeneralUtility.php b/typo3/sysext/core/Classes/Utility/GeneralUtility.php
index 2285f3a..3360bed 100644
--- a/typo3/sysext/core/Classes/Utility/GeneralUtility.php
+++ b/typo3/sysext/core/Classes/Utility/GeneralUtility.php
@@ -26,6 +26,8 @@ namespace TYPO3\CMS\Core\Utility;
  *
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
+use TYPO3\CMS\Core\Core\Bootstrap;
+
 /**
  * The legendary "t3lib_div" class - Miscellaneous functions for general purpose.
  * Most of the functions do not relate specifically to TYPO3
@@ -2856,7 +2858,7 @@ Connection: close
 	 */
 	static public function flushDirectory($directory, $keepOriginalDirectory = FALSE) {
 		$result = FALSE;
-
+error_log(Bootstrap::getInstance()->getRequestId() . ' flush '.$directory);
 		if (is_dir($directory)) {
 			$temporaryDirectory = rtrim($directory, '/') . '.' . uniqid('remove') . '/';
 			if (rename($directory, $temporaryDirectory)) {