Fixed bug #36006 (Problem with $this in __destruct())

Zend/tests/bug36006.phpt

@@ -0,0 +1,30 @@
+--TEST--
+Bug #36006 (Problem with $this in __destruct())
+--FILE--
+<?php
+
+class Person {
+	public $dad;
+	public function __destruct() {
+		$this->dad = null; /* no segfault if this is commented out */
+	}
+}
+
+class Dad extends Person {
+	public $son;
+	public function __construct() {
+		$this->son = new Person;
+		$this->son->dad = $this; /* no segfault if this is commented out */
+	}
+	public function __destruct() {
+		$this->son = null;
+		parent::__destruct(); /* segfault here */
+	}
+}
+
+$o = new Dad;
+unset($o);
+echo "ok\n";
+?>
+--EXPECT--
+ok

Zend/zend_objects_API.c

@@ -52,7 +52,9 @@ ZEND_API void zend_objects_store_call_destructors(zend_objects_store *objects TS
 			if (!objects->object_buckets[i].destructor_called) {
 				objects->object_buckets[i].destructor_called = 1;
 				if (obj->dtor && obj->object) {
+					obj->refcount++;
 					obj->dtor(obj->object, i TSRMLS_CC);
+					obj->refcount--;
 				}
 			}
 		}