Fix coroutine garbage collection: Prevent double ZVAL_DELREF by skipping duplicate symbol tables

Author: EdmondDantes

coroutine.c

@@ -308,7 +308,18 @@ static HashTable *async_coroutine_object_gc(zend_object *object, zval **table, i
 			symTable = zend_unfinished_execution_gc_ex(
 					ex, ex->func && ZEND_USER_CODE(ex->func->type) ? ex->call : NULL, buf, false);
 		}
+
 		if (symTable) {
+			/*
+			 * Skip if this is the same symbol_table as previous frame (include shares symbol_table)
+			 * Include operators inherit the symbol_table,
+			 * which causes the same zval to be registered twice in the garbage collector.
+			 * This leads to a double ZVAL_DELREF attempt.
+			 */
+			if (lastSymTable && lastSymTable == symTable) {
+				continue;
+			}
+
 			if (lastSymTable) {
 				zval *val;
 				ZEND_HASH_FOREACH_VAL(lastSymTable, val)