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To: Antony Dovgal <tony@daylessday.org>, php-dev <internals@lists.php.net>
Date: Tue, 4 Oct 2011 09:34:46 -0400
Thread-Topic: [PHP-DEV] zend memory managment null pointer dereference
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Subject: RE: [PHP-DEV] zend memory managment null pointer dereference
From: Alan.Chester@tekelec.com ("Chester, Alan")

Antony,

I am fairly confident we are not using any third party caching (ie apc, eAc=
celerator,etc).  However other then running php --version is there any othe=
r way to verify what caching system is being used?

[root@cab4en2b7 ~]# php --version
PHP 5.2.17 (cli) (built: Aug  2 2011 13:33:29)
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2010 Zend Technologies
    with Xdebug v2.0.3, Copyright (c) 2002-2007, by Derick Rethans


Also trying to find a reproducer I have wrote a test php script which creat=
es multiple objects and another script which sends signals to the script wh=
ich is creating objects to try to get into the faulty cleanup.  I have had =
little success with this and was wondering if this is not the best way to t=
ry to reproduce this or if there is a better way which may cause the memory=
 to get corrupted?  Also will this type of issue be seen with stand alone p=
hp or would I need this to be running with http?

Thanks,
Alan

=20
-----Original Message-----
From: Antony Dovgal [mailto:tony@daylessday.org]=20
Sent: Monday, October 03, 2011 4:21 PM
To: Chester, Alan; php-dev
Subject: Re: [PHP-DEV] zend memory managment null pointer dereference

On 10/04/2011 12:06 AM, Chester, Alan wrote:
> Antony,
>
> Thank you for the quick response.  I will work towards finding a reproduc=
er and using valgrind to gather more information.
>
> Since I have been trying for to find a reproducer but have had no luck so=
 far, do you think reducing the cache size
>  would help in finding a reproducer? If so how is this done?  Or does cac=
he/cache size have nothing to do with this area of code?

Reducing the cache size will not help for sure, but disabling the cache ent=
irely will
help us to understand whether this problem is caused by your cache or not.

Btw, you didn't specify which kind of cache is that.
 =20
> Also would you like to me open a bug ticket to track this issue?

It depends on the kind of cache you're using (there are several caches on t=
he market
that aren't part of PHP project) and whether the cache is guilty or not.

--=20
Wbr,
Antony Dovgal
---
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