php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #77495 STMT execute memory leak
Submitted: 2019-01-21 00:47 UTC Modified: 2020-12-27 04:22 UTC
Votes:5
Avg. Score:4.4 ± 0.8
Reproduced:4 of 4 (100.0%)
Same Version:2 (50.0%)
Same OS:3 (75.0%)
From: istvan at dupai dot hu Assigned:
Status: No Feedback Package: MySQLi related
PHP Version: 7.3.1 OS: Windows
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
(description)
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: istvan at dupai dot hu
New email:
PHP Version: OS:

 

 [2019-01-21 00:47 UTC] istvan at dupai dot hu
Description:
------------
MySQLi prepared statement execution in a loop increases memory consumption rapidly constantly.

Test script:
---------------
$now = microtime(true);
$db = new \Mysqli("localhost", "root", "password", "database", 3306);

$stmt = $db->prepare("SELECT * FROM someTable WHERE id=?");
$stmt->bind_param("i", $id);

for( $id=1; $id<1000; $id++ ) {
    $stmt->execute();
    $result = $stmt->get_result();
    $stmt->free_result();
}

echo "Time taken: ".(microtime(true)-$now)." seconds\n";
echo "Peak memory usage: ".number_format(memory_get_peak_usage())." bytes\n";

Expected result:
----------------
Memory usage should peak and stay around 400 KBs.

Actual result:
--------------
Memory usage constantly grows.

Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2020-01-07 11:05 UTC] thomas dot kosel at aspera dot com
I can reproduce this on 7.3.6 in a docker environment
The issue did not apply, when the prepare and bind parts are in the loop too.
 [2020-12-18 09:42 UTC] nikic@php.net
-Status: Open +Status: Feedback
 [2020-12-18 09:42 UTC] nikic@php.net
I can't reproduce this. I think early 7.3 versions did have issues with result set leaks, so I suspect this has already been fixed in the meantime. Do you still see this issue?
 [2020-12-27 04:22 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Fri Mar 29 10:01:28 2024 UTC