Re: PHP7 Zend Heap validation

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 > > ________________________________ > > This e-mail is for the sole use of the intended recipient and contains > information that may be privileged and/or confidential. If you are not an > intended recipient, please notify the sender by return e-mail and delete > this e-mail and any attachments. Certain required legal entity disclosures > can be accessed on our website.< > http://site.thomsonreuters.com/site/disclosures/> > -- Xinchen Hui @Laruence http://www.laruence.com/