Bug #60715 [NEW]: Segfault

From: Date: Wed, 11 Jan 2012 15:44:15 +0000
Subject: Bug #60715 [NEW]: Segfault
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-166364@lists.php.net to get a copy of this message 
From:             
Operating system: Debian
PHP version:      5.4.0RC5
Package:          Reproducible crash
Bug Type:         Bug
Bug description:Segfault 

Description:
------------
I can fix this segfault by either removing the ATTR_PERSISTENT option, or
by 
assigning parent::prepare to a local variable (i.e. $stmt = 
parent::prepare('...'))

Also worth nothing I had to compile PHP as shared due to a bug when trying
to 
compile the extension with mysqlnd which is filed in a separate report.

Linux localdev 3.1.0-1-amd64 #1 SMP Fri Dec 23 16:37:11 UTC 2011 x86_64
GNU/Linux

$ php -v
PHP 5.4.0RC5 (cli) (built: Jan 10 2012 19:42:22) 
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies

$ phpize -v
Configuring for:
PHP Api Version:         20100412
Zend Module Api No:      20100525
Zend Extension Api No:   220100525

$ cat /etc/issue
Debian GNU/Linux wheezy/sid \n \l

$ mysql --version
mysql  Ver 14.14 Distrib 5.1.58, for debian-linux-gnu (x86_64) using
readline 6.2



Test script:
---------------
<?php

class BuggedPDO extends PDO {

  protected $stmt = null;

  public function __construct() {
    $options = array(
      \PDO::ATTR_PERSISTENT => true, 
      \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
    );

    try {
      parent::__construct('mysql:dbname=testdb;host=localhost', 'testuser',
'testpass', $options);
      $this->stmt = parent::prepare('select * from table');
    } catch (\Exception $ex) {
      var_dump($ex);
    }
  }
}

$test = new BuggedPDO();

Expected result:
----------------
A proper resource in $this->stmt

Actual result:
--------------
Jan 11 10:26:00 kernel: [  956.330577] php-fpm[2255]: segfault at 0 ip 
0000000000729beb sp 00007fffad56c8e0 error 4 in php-fpm[400000+76d000]

-- 
Edit bug report at https://bugs.php.net/bug.php?id=60715&edit=1
-- 
Try a snapshot (PHP 5.4):            https://bugs.php.net/fix.php?id=60715&r=trysnapshot54
Try a snapshot (PHP 5.3):            https://bugs.php.net/fix.php?id=60715&r=trysnapshot53
Try a snapshot (trunk):              https://bugs.php.net/fix.php?id=60715&r=trysnapshottrunk
Fixed in SVN:                        https://bugs.php.net/fix.php?id=60715&r=fixed
Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=60715&r=needdocs
Fixed in release:                    https://bugs.php.net/fix.php?id=60715&r=alreadyfixed
Need backtrace:                      https://bugs.php.net/fix.php?id=60715&r=needtrace
Need Reproduce Script:               https://bugs.php.net/fix.php?id=60715&r=needscript
Try newer version:                   https://bugs.php.net/fix.php?id=60715&r=oldversion
Not developer issue:                 https://bugs.php.net/fix.php?id=60715&r=support
Expected behavior:                   https://bugs.php.net/fix.php?id=60715&r=notwrong
Not enough info:                     https://bugs.php.net/fix.php?id=60715&r=notenoughinfo
Submitted twice:                     https://bugs.php.net/fix.php?id=60715&r=submittedtwice
register_globals:                    https://bugs.php.net/fix.php?id=60715&r=globals
PHP 4 support discontinued:          https://bugs.php.net/fix.php?id=60715&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=60715&r=dst
IIS Stability:                       https://bugs.php.net/fix.php?id=60715&r=isapi
Install GNU Sed:                     https://bugs.php.net/fix.php?id=60715&r=gnused
Floating point limitations:          https://bugs.php.net/fix.php?id=60715&r=float
No Zend Extensions:                  https://bugs.php.net/fix.php?id=60715&r=nozend
MySQL Configuration Error:           https://bugs.php.net/fix.php?id=60715&r=mysqlcfg

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