Eric Stenson in php.windows (Thu, 25 Jul 2013 18:35:25 +0000): >I've filed bug https://bugs.php.net/bug.php?id=65338 to track this >issue. The root cause of the AV is when more than one module hooks the >interned strings, a "wrong" value will be left in >CG(interned_strings_start), which the Zend core thinks contains the >value that it alloc'd during zend_interned_strings_init(). > >I've added a potential fix for the Zend folks to consider. It's >slightly less harsh than the workaround provided by Jan. ;) The problem is so obvious, that I am surprised it did not com to surface earlier. And the patch is elegant: do not assume interned_strings_start is still the same, but free only the memory that you owned at startup. In fact, the patch should be backported to PHP 5.4 as well. I do not have a use case for X86, but I ran into the same problem woth PHP 5.4 X64. I know this is no official version, but as an illustration of the problem it still is useful. Compare these two builds: https://dl.dropboxusercontent.com/u/8954372/php-5.4.17-nts-Win32-VC9-x64.zip https://dl.dropboxusercontent.com/u/8954372/php-5.4.17-nts-Win32-VC9-x64_patched.zip Try the unpatched one first. Put this in your php.ini: extension=php_wincache.dll zend_extension=ext/php_opcache.dll zend_opcache.memory_consumption=128 zend_opcache.interned_strings_buffer=8 zend_opcache.max_accelerated_files=4000 zend_opcache.revalidate_freq=60 zend_opcache.fast_shutdown=1 zend_opcache.enable_cli=1 wincache.ocenabled=0 wincache.fcenabled=0 wincache.ucachesize=768 wincache.enablecli=1 session.savehandler=wincache Then run from the commandline in your php-directory: php-cgi.exe -m php-cgi will crash after showing the loaded modules. Debugging with VC9 gave this result: http://x32.elijst.nl/zendfree.png Quite another breakpoint as in the PHP 5.5 example, but with the same cause: freeing memory you do not own. In the patched build I backported Eric's patch for zend_string.c to PHP 5.4. Result: no crash anymore. A last remark: i do not think the problem is Windows specific. This is exectly the same problem, but with the combination of opcache and apc: http://svn.php.net/viewvc?view=revision&revision=330859 Jan -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
