[php-src] Issue #9968: Segmentation Fault during OPCache Preload in PHP 8.1/PHP8.2

Issue: https://github.com/php/php-src/issues/9968 Author: michdingpayc ### Description Dear PHP Maintainers, **The following code**, a barebones reproduction is available at https://github.com/michdingpayc/preload-segfault-minimum-reproduction The problematic preloaded file: ```php class Root1_Constant_Referencer extends Root2_Empty_Empty // Removing the extends clause will cause preloading to succeed // Changing the extends clause to Root1_Constant_Empty will cause preloading to succeed // Changing the extends clause to a non-existent class will continue causing preloading to segfault { protected $propertyReferencingAnExternalConstant = Root1_Constant_Definer::CONSTANT; // Removing this line will cause preloading to succeed // Changing this to a hardcoded value will cause preloading to succeed } ``` preload.php: ```php echo "Preload started." . PHP_EOL; $files = require __DIR__ . '/vendor/composer/autoload_classmap.php'; foreach ($files as $file) { @opcache_compile_file($file); } echo "Finished preloading" . PHP_EOL; ``` **Resulted in this output**: ``` $ docker-compose up Recreating preload-segfault-minimum-reproduction_webpreloader_1 ... Recreating preload-segfault-minimum-reproduction_webpreloader_1 ... done Attaching to preload-segfault-minimum-reproduction_webpreloader_1 webpreloader_1 | Preload started. webpreloader_1 | Finished preloading preload-segfault-minimum-reproduction_webpreloader_1 exited with code 139 ``` **But I expected this output instead**: (No segmentation Fault. The following output occurs if you comment out the opcache_compile_file call in preload.php) ``` $ docker-compose up Starting preload-segfault-minimum-reproduction_webpreloader_1 ... Starting preload-segfault-minimum-reproduction_webpreloader_1 ... done Attaching to preload-segfault-minimum-reproduction_webpreloader_1 webpreloader_1 | Preload started. webpreloader_1 | Finished preloading webpreloader_1 | Thu Nov 17 18:15:38 2022 (1): Message Cached script '$PRELOAD$' webpreloader_1 | Thu Nov 17 18:15:38 2022 (1): Message Cached script '/var/www/html/lib/preload.php' webpreloader_1 | Thu Nov 17 18:15:38 2022 (1): Message Cached script '/var/www/html/lib/vendor/composer/autoload_classmap.php' ``` Recommendations attempted: (in all cases the result is the same) 1. Changing base docker image from php:8.1.1-fpm-alpine3.15 to php:8.1.12-fpm-alpine3.15 and php:8.2-rc-fpm-alpine3.15. 2. Different settings for opcache.jit directive: disable, 0, 0000, 0205, 1205. 3. Setting opcache.jit_buffer_size directive to 0. Similar to https://github.com/php/php-src/issues/7817 though narrower in scope. Running the docker-compose command in the linked repository will consistently reproduce the issue. This is a blocker for our PHP 8.1 migration. Will you please assist? ### PHP Version PHP 8.1.1 8.1.12 8.2 ### Operating System Docker php:8.1.1-fpm-alpine3.15