Bug #72466 [Nab]: Memory leak

From: Date: Wed, 22 Jun 2016 08:53:15 +0000
Subject: Bug #72466 [Nab]: Memory leak
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-201794@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=72466&edit=1

 ID:                 72466
 User updated by:    rusa959 at gmail dot com
 Reported by:        rusa959 at gmail dot com
 Summary:            Memory leak
 Status:             Not a bug
 Type:               Bug
 Package:            *General Issues
 Operating System:   Ubuntu 16.04 LTS
 PHP Version:        5.6.22
 Block user comment: N
 Private report:     N

 New Comment:

Thank you!
My script reached memory limit earlier than php reached limit that needed to run garbage collector.


Previous Comments:
------------------------------------------------------------------------
[2016-06-22 08:12:08] nikic@php.net

The cycle collector will release this memory once it runs.

------------------------------------------------------------------------
[2016-06-22 07:49:15] rusa959 at gmail dot com

Possible memory is not released because "callback" variable has internal reference to
object by variable $this

------------------------------------------------------------------------
[2016-06-22 07:41:08] rusa959 at gmail dot com

Description:
------------
In php versions 7.0.6, 5.6.22, 5.6.16, 5.4.35
I have construct object that have anonymous function in his field named "callback".
When i am trying to unset object - object is still exists, memory that allocated to object is not
released.
In php version 5.3.10 memory is released.

Test script:
---------------
<?php
class Leak
{
    protected $callback;

    public function set()
    {
        $this->callback = function(){};
    }
}
$base_usage = memory_get_usage();
for($i=0;$i<12;$i++) {
    echo 'step-1 ' . (memory_get_usage() - $base_usage) . PHP_EOL;
    $leak = new Leak();
    $leak->set();
    unset($leak);
    echo 'step-2 ' . (memory_get_usage() - $base_usage) . PHP_EOL;
}
echo 'step-3 ' . (memory_get_usage() - $base_usage) . PHP_EOL;

Expected result:
----------------
step-1 344
step-2 840
step-1 840
step-2 840
step-1 840
step-2 840
step-1 840
step-2 840
step-1 840
step-2 840
step-1 840
....

Actual result:
--------------
step-1 344
step-2 840
step-1 840
step-2 1328
step-1 1328
step-2 1816
step-1 1816
step-2 2304
step-1 2304
step-2 2792
step-1 2792
step-2 3280
....


------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=72466&edit=1

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