Bug #55219 [NEW]: Segmentation fault with Serializable Object on self-reference

From: Date: Sun, 17 Jul 2011 03:46:29 +0000
Subject: Bug #55219 [NEW]: Segmentation fault with Serializable Object on self-reference
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-161922@lists.php.net to get a copy of this message 
From:             
Operating system: Ubuntu Linux 10.10 x64
PHP version:      5.3.6
Package:          Reproducible crash
Bug Type:         Bug
Bug description:Segmentation fault with Serializable Object on self-reference

Description:
------------
---
From manual page: http://www.php.net/class.serializable
---

When a Serializable object contains a reference to it self a Segmentation
fault 
is caused.

I first encountered this in 5.3.3, then found a binary package for 5.3.5
for my 
distribution. Finally I compiled my own 5.3.6. The segmentation fault
persists in 
all three versions.

If the Serializable interface is removed the code works fine. 

Although the fault is reproducible, I found encountered other
self-reference 
scenarios where it is not triggered, making this very unpredictable.

Test script:
---------------
class Test implements Serializable {
	public $member, $message;
	
	function __construct($message) {
		$this->message = $message;
	}

	function serialize() {
		return serialize(array($this->message, $this->member));
	}
	
	function unserialize($serialized) {
		list($this->message, $this->member) = unserialize($serialized); 
	}
}

$constructed = new Test("original");
$constructed->member = $constructed; //References to self (in this example
pointless, but technically legal)
var_dump($constructed);
$transported = unserialize(serialize($constructed)); // Segmentation fault.

Expected result:
----------------
Clean exit..

Actual result:
--------------
object(Test)#1 (2) {
  ["member"]=>
  *RECURSION*
  ["message"]=>
  string(8) "original"
}
Segmentation fault


-- 
Edit bug report at https://bugs.php.net/bug.php?id=55219&edit=1
-- 
Try a snapshot (PHP 5.2):            https://bugs.php.net/fix.php?id=55219&r=trysnapshot52
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=55219&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=55219&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=55219&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55219&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=55219&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=55219&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=55219&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=55219&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=55219&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=55219&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=55219&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=55219&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=55219&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=55219&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=55219&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=55219&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=55219&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=55219&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=55219&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=55219&r=mysqlcfg
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=55219&r=trysnapshot54

Thread (5 messages)

« previous php.bugs (#161922) next »