#39328 [Bgs]: Memory leak when object contains reference to "parent" object
| From: | taneli at crasman dot fi | Date: | Wed, 01 Nov 2006 09:04:56 +0000 |
| Subject: | #39328 [Bgs]: Memory leak when object contains reference to "parent" object | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-104246@lists.php.net to get a copy of this message | ||
ID: 39328
User updated by: taneli at crasman dot fi
Reported By: taneli at crasman dot fi
Status: Bogus
Bug Type: Scripting Engine problem
Operating System: Linux
PHP Version: 5.1.6
New Comment:
That was quick. Looks like another version of this is assigned already
(just found it), so how come this was marked "Bogus"? :)
http://bugs.php.net/bug.php?id=33595
Previous Comments:
------------------------------------------------------------------------
[2006-11-01 09:01:11] derick@php.net
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to
report
a bug at http://bugs.php.net/how-to-report.php
.
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[2006-11-01 08:52:20] taneli at crasman dot fi
Description:
------------
The example says it the best. Reproducible in both 5.1.6 and 4.4.4
(with minor changes), all extensions disabled. Definately related to
references, although I'm not sure if the code below is good practice,
but I've run into it on more than one occasion. I think it should be
freeing the objects when they go out of scope, but the reference
counting must be broken somehow.
Might be related to #22055, but this one's been around for ages.
Reproduce code:
---------------
<?php {
class A {
var $ba;
function A() {
$this->ba = array();
for ($i = 0; $i < 100; $i++)
$this->ba[] = new B($this);
}
function __destruct() { // never gets called
die("Freeing class A\n");
}
}
class B {
var $a;
function B($a) { // function B(&$a), and:
$this->a = $a; // $this->a =& $a; leaks in php 4.4.4
// remove line above to prevent leak
}
function __destruct() { // never gets called either
die("Freeing class B\n");
}
}
$smu = memory_get_usage();
while (true) {
$ba = array();
for ($i = 0; $i < 100; $i++)
$ba[] = new A();
$emu = memory_get_usage();
echo sprintf("leak %.1f kB\r", ($emu - $smu) / 1024.0);
}
}?>
Expected result:
----------------
No memory leak.
Actual result:
--------------
Rapidly increasing memory leak.
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Edit this bug report at http://bugs.php.net/?id=39328&edit=1