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Bug #81335 PHP Warning, Packets out of order after connection timeout
Submitted: 2021-08-06 10:37 UTC Modified: 2021-09-14 12:27 UTC
Avg. Score:3.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:1 (50.0%)
From: bohuslav at simek dot si Assigned:
Status: Verified Package: PDO MySQL
PHP Version: 7.4.22 OS: Alpine Linux 3.14
Private report: No CVE-ID: None
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 [2021-08-06 10:37 UTC] bohuslav at simek dot si
After migration from MySQL 8.0.23 to 8.0.25 a warning "Packets out of order. Expected 1 received 0. Packet size=145" will be shown after MySQL connection timeout. mysqlnd is used a as connection library.


PDO Driver for MySQL => enabled
Client API version => mysqlnd 8.0.8

I don't want to speculate, but this can be caused by changes introduce in Connection Management by MySQL 8.0.24 ( header Connection Management Notes) as MySQL now provides reason why client has been disconnected.

Test script:
<?php declare(strict_types=1);

$options = [
    PDO::ATTR_PERSISTENT         => false,
    PDO::MYSQL_ATTR_INIT_COMMAND => 'SET time_zone = "UTC"',

$pdo = new PDO(

$pdo->exec('SET SESSION wait_timeout=1');
$pdo->exec('SELECT 123'); // PHP Warning:  Packets out of order. Expected 1 received 0. Packet size=145

Expected result:
warning "Packets out of order. Expected 1 received 0. Packet size=145" should not happen.


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 [2021-08-06 12:43 UTC]
-Status: Open +Status: Verified
 [2021-08-06 12:43 UTC]
Thanks for reporting. This indeed should be fixed in mysqlnd. Tested on git.master and the mysqlnd client doesn't notice the connection has dropped when sending a query.
 [2021-08-06 18:16 UTC]
With MySQL 5.6.44 and 8.0.19 I get:
SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

I'm waiting for the update to 8.0.26 to finish for about eight
hours now.  I'll test with that version when it's finished (if it
ever finishes).
 [2021-09-14 12:27 UTC]
Oops, forgot about this.  Anyway, result with git-master and MySQL

SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

Is this Linux specific?
 [2021-09-30 20:23 UTC] vovikems at gmail dot com
Having same error using official docker images: php:8.0.9-cli and mysql:8.0.26. Typically this error seen on first DB query since long time (about 10h-15h) keeping DB connection without any query sent. Next query is always ok.
FYI i'm using long-running php application (RoadRunner, Spiral Framework, CycleORM).
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Last updated: Wed Oct 20 19:03:32 2021 UTC