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Date: Sat, 26 Dec 2015 13:30:25 +0800
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To: akin.ocal@thomsonreuters.com
Cc: PHP Internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] PHP7 Zend Heap validation
From: laruence@php.net (Xinchen Hui)

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Hey:

On Sat, Dec 26, 2015 at 1:01 PM, <akin.ocal@thomsonreuters.com> wrote:

> Hi everyone,
>
> I am working on porting a pre-PHP7 database driver extension to PHP7 for
> Windows platforms.
> ( I am using PHP 7.0.1 master branch code and targeting non-ZTS 32 bit
> PHP7 on Windows Server 2012 R2 )
> And currently as I did mechanical bits of porting ( compilation issues,
> getting functionality working
> mostly followed https://wiki.php.net/phpng-upgrading ) , my extension is
> only crash-free if I run it with
> USE_ZEND_ALLOC=0.
>
> However with USE_ZEND_ALLOC=1 , I am getting crashes inside
> zend_mm_alloc_small. As checked with Windbg :
> ...
> if (EXPECTED(heap->free_slot[bin_num] != NULL) )
>                 {
>                                 zend_mm_free_slot *p =
> heap->free_slot[bin_num];
>                                 if ( p->next_free_slot != NULL )


> Above , p->next_free_slot is not readable. I believe , currently I am
> getting the Zend heap corrupt.
> I am running a test script and  I tried disabling many things ,and
> enabling one by one to have an idea, from the looks of it , I am getting
> this issue
> around a zend_register_resource call but to me that one looks legitimate
> so I can`t easily pinpoint where the Zend heap gets corrupt.
>
> Diffrently from pre-PHP7 where we had full_mem_check , now I can see
> ZEND_MM_CHECK is placed in memory manager functions.
>
> I wanted to ask if there is any chance if we can have a heap integrity
> checker function , or what would you advise
> regarding to track down the places in our code corrupting the Zend MM ?
>
I am not familar with windows, but if it can be run in linux

you could try with "USE_ZEND_ALLOC=0 valgrind --tool=memcheck "

not sure if there is similar tool on windows


thanks

>
> Regards,
> Akin Ocal
>
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-- 
Xinchen Hui
@Laruence
http://www.laruence.com/

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