Bug #80125 [NEW]: CallbackFilterIterator is leaking memory

From: Date: Sun, 20 Sep 2020 13:12:33 +0000
Subject: Bug #80125 [NEW]: CallbackFilterIterator is leaking memory
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-229098@lists.php.net to get a copy of this message 
From:             mvorisek at mvorisek dot cz
Operating system: linux
PHP version:      7.4.10
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:CallbackFilterIterator is leaking memory

Description:
------------
see test script, explicit GC does not help

the issues seems present when the given callback to
CallbackFilterIterator is bound (eg. not static)

https://3v4l.org/UpmHK

Test script:
---------------
class IteratorWithFilter
{
    public $generator;

    public function __construct(array $data)
    {
        $this->generator = new \ArrayIterator($data);
    }

    public function filter()
    {
        $this->generator = new \CallbackFilterIterator($this->generator,
function ($row)  {
            return true;
        });
        
        return $this;
    }
}

function createIterator() {
    $iter = new IteratorWithFilter([['a'], ['b']]);
    return $iter->filter();
}

for ($i = 0; $i < 50 * 1000; $i++) {
    createIterator();
    
    if (($i % 1000) === 0) {
        // gc_collect_cycles(); // explicit GC does not help...
        echo round(memory_get_usage() / (1024 * 1024), 3) . " MiB\n";
    }
}

Expected result:
----------------
reported memory usage should stay below 1 MiB

Actual result:
--------------
0.375 MiB
1.719 MiB
3.071 MiB
4.36 MiB
5.774 MiB
7.064 MiB
8.353 MiB
9.892 MiB
...

-- 
Edit bug report at https://bugs.php.net/bug.php?id=80125&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=80125&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=80125&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=80125&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=80125&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=80125&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=80125&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=80125&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=80125&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=80125&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=80125&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=80125&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=80125&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=80125&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=80125&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=80125&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=80125&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=80125&r=mysqlcfg

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