The PHP files were downloaded from http://windows.php.net/downloads/releases/php-5.5.17-Win32-VC11-x86.zip, the Apache files from http://www.apachelounge.com/download/VC11/binaries/httpd-2.4.10-win32-VC11.zip. The backtrace above is with OPcache enabled which may obfuscate the problem(?).  Most of the backtraces contain the message "This thread is not fully resolved and may or may not be a problem. Further analysis of these threads may be required." and I've been unable to capture a backtrace that doesn't contain this warning with OPcache turned off. Here's an example, with OPcache turned off in case it helps:

Entry point   libhttpd!ap_regkey_value_set+1bf0 
Create time   07/10/2014 11:30:52 
Time spent in user mode   0 Days 00:00:01.450 
Time spent in kernel mode   0 Days 00:00:00.109 

This thread is not fully resolved and may or may not be a problem. Further analysis of these threads may be required.

Function  Source
php5ts!zend_hash_find+f0 [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_hash.c @ 924 + 5]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_hash.c @ 924 + 5 
php5ts!zend_set_compiled_filename+3b [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_compile.c @ 254 + 29]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_compile.c @ 254 + 29 
php5ts!open_file_for_scanning+10b [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_language_scanner.l @ 539]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_language_scanner.l @ 539 
php5ts!compile_file+6e [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_language_scanner.l @ 574 + 9]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\zend\zend_language_scanner.l @ 574 + 9 
php5ts!phar_compile_file+204 [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\ext\phar\phar.c @ 3383 + 19]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\ext\phar\phar.c @ 3383 + 19 
0x05b538c8    
php5ts!phar_compile_file+1eb [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\ext\phar\phar.c @ 3383]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\ext\phar\phar.c @ 3383 
libapr_1!apr_pstrcat+86    
msvcr110!__crtFlsGetValue+15    
msvcr110!_getptd_noexit+6a    
0x058fe168    
php5apache2_4!php_handler+1c1 [c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\sapi\apache2handler\sapi_apache2.c @ 611 + 3a]   c:\php-sdk\php55\vc11\x86\php-5.5.17-ts\sapi\apache2handler\sapi_apache2.c @ 611 + 3a 
kernel32!BaseThreadInitThunk+e    
ntdll!__RtlUserThreadStart+70    
ntdll!_RtlUserThreadStart+1b

Thanks for reporting. Yeah, a crash with opcache enabled might be well just a consequence of the original issue. So lets concentrate on naling the issue without opcache first.

Maybe it would be possible to at least extract an URL on which the crash was happening (probably some item with 500 status in the logs)? Or maybe you could try to reproduce on some dev system, then there were some more room for debugging.

Unfortunately disabling phar won't work as it's compiled statically. Btw are there some phar files used in the app, by chance? It could be, that phar clashes with some extension which needs to be loaded before phar, but it's hard to guess without being able to properly debug

Thanks

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