Index: branches/5.2.x/core/kernel/utility/temp_handler.php
===================================================================
diff -u -N -r16733 -r16770
--- branches/5.2.x/core/kernel/utility/temp_handler.php	(.../temp_handler.php)	(revision 16733)
+++ branches/5.2.x/core/kernel/utility/temp_handler.php	(.../temp_handler.php)	(revision 16770)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: temp_handler.php 16733 2022-09-16 14:22:19Z alex $
+* @version	$Id: temp_handler.php 16770 2023-11-21 09:05:59Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -988,24 +988,24 @@
 		} while ($another_coping_active && ($sleep_count <= 30));
 
 		if ($sleep_count > 30) {
-			// another coping process failed to finished in 30 seconds
+			// Another coping process failed to finished in 30 seconds.
 			$error_message = $this->Application->Phrase('la_error_TemporaryTableCopyingFailed');
 			$this->Application->SetVar('_temp_table_message', $error_message);
 
+			$log = $this->Application->log('Parallel item saving attempt detected');
+			$log->addTrace();
+			$log->setLogLevel(kLogger::LL_ERROR);
+			$log->write();
+
 			return false;
 		}
 
-		// mark, that we are coping from temp to live right now, so other similar attempt (from another script) will fail
-		$fields_hash = Array (
-			'SessionKey' => $this->Application->GetSID(),
-			'Timestamp' => adodb_mktime(),
-			'MainPrefix' => $this->Tables['Prefix'],
-			'MainIDs' => implode(',', $master_ids),
-		);
+		/*
+		 * Mark, that we are coping from temp to live right now,
+		 * so other similar attempt (from another script) will fail.
+		 */
+		$semaphore_id = $this->createSemaphore($conn, $master_ids);
 
-		$conn->doInsert($fields_hash, TABLE_PREFIX.'Semaphores');
-		$semaphore_id = $conn->getInsertID();
-
 		// unlock table now to prevent permanent lock in case, when coping will end with SQL error in the middle
 		$conn->ChangeQuery('UNLOCK TABLES');
 
@@ -1023,6 +1023,33 @@
 		return $ids;
 	}
 
+	/**
+	 * Creates a semaphore.
+	 *
+	 * @param IDBConnection $conn       Database connection.
+	 * @param array         $master_ids Master record IDs.
+	 *
+	 * @return integer
+	 */
+	protected function createSemaphore(IDBConnection $conn, array $master_ids)
+	{
+		$fields_hash = array(
+			'SessionKey' => $this->Application->GetSID(),
+			'Timestamp' => adodb_mktime(),
+			'MainPrefix' => $this->Tables['Prefix'],
+			'MainIDs' => implode(',', $master_ids),
+			'UserId' => $this->Application->RecallVar('user_id'),
+			'IPAddress' => $this->Application->getClientIp(),
+			'Hostname' => $_SERVER['HTTP_HOST'],
+			'RequestURI' => $_SERVER['REQUEST_URI'],
+			'Backtrace' => serialize(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS)),
+		);
+
+		$conn->doInsert($fields_hash, TABLE_PREFIX . 'Semaphores');
+
+		return $conn->getInsertID();
+	}
+
 	function CancelEdit($master=null)
 	{
 		if (!isset($master)) $master = $this->Tables;