Bug #53287 [Asn->Nab]: PDO 5 Byte write to a broken pipe when forked
Edit report at https://bugs.php.net/bug.php?id=53287&edit=1
ID: 53287
Updated by: johannes@php.net
Reported by: bryan dot tong at gigenet dot com
Summary: PDO 5 Byte write to a broken pipe when forked
-Status: Assigned
+Status: Not a bug
Type: Bug
Package: PDO related
Operating System: CentOS 5.5 x86-64
PHP Version: 5.3SVN-2010-11-10 (snap)
Assigned To: mysql
Block user comment: N
Private report: N
New Comment:
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
Previous Comments:
------------------------------------------------------------------------
[2011-01-31 10:42:56] bryan dot tong at gigenet dot com
Though it can really make parsing the output a pain when there are multiple versions of mysqlnd
floating about.
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[2011-01-31 10:27:42] uw@php.net
This does not smell like an error rather more like mysqlnd being more verbose. No bug, a feature,
I'd say.
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[2010-12-05 21:23:46] seza at paradoxal dot org
I have the same error message with php.5.3.3 (send of 5 bytes failed with errno=32 Broken pipe) but
in a
different context more simply to reproduce :
I have a simple website (no fork or stuff like that). It make persistent connection with pdo to
mysql
(mysqlnd). The errors are raised when the mysql is server is restarted.
When mysql server is off error message are mysql server is gone away. No problem with that but once
the
mysql server is restarted and during 15 minutes I have sometimes this error message (send of 5 bytes
failed with errno=32 Broken pipe).
Certainly a reuse of a cached connection to mysql before it was restarted.
PS : I use mysql_sock connection (mysql:unix_socket=/var/run/mysqld/mysqld.sock)
------------------------------------------------------------------------
[2010-11-26 13:19:45] johannes@php.net
The description mentions forking, the sample code not. Please provide a complete script showing the
issue.
------------------------------------------------------------------------
[2010-11-10 03:21:00] bryan dot tong at gigenet dot com
Description:
------------
When switching from PHP 5.1.6 to PHP 5.3.3 the following notice has begun to show up in our scripts.
PDO::__construct(): send of 5 bytes failed with errno=32 Broken pipe
We are running a daemon and the forked children throw this error on the PDO construct that is used
to refresh the class.
The error changes depending on whether a persistent connection is set or not.
When persistent is on the above error is produced. Without persistent connection applied the error
is thrown when the class is destructed.
Example: $pdo = null;
send of 5 bytes failed with errno=32 Broken pipe
We have confirmed this to be apparent in PHP 5.3.3 and the trunk build. I was unable to test on 5.2,
but I was able to confirm this bug does not occur on 5.1.6
I have tried wrapping ob functions around the calls in case the broken pipe happened to be stdout
but I think it is the mysql socket that is in question. On that same note, switching mysql to
connect via tcp did not help.
From searching I found a site that threw this error but no discussions of it.
Let me know any additional information that is needed.
Test script:
---------------
// without persistance
public static function shutdown(){
$base = Base::getBase();
$base->db = null;
self::$base = false;
}
// with persistance
$this->pdo = new PDO(
$dsn,
$user,
$pass,
array(
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_PERSISTENT=> true
)
);
Expected result:
----------------
The PDO class should startup quietly when persistent connections are enabled and destruct quietly
when persistent connections are disabled.
Actual result:
--------------
PDO::__construct(): send of 5 bytes failed with errno=32 Broken pipe with persistent connections.
Base::shutdown(): send of 5 bytes failed with errno=32 Broken pipe without persistent connections.
I believe this problem is only related to forked processes. I have confirmed the standard page
serving to not throw this.
------------------------------------------------------------------------
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