[php-src] Issue #8159: Apache / PHP segfaults (PHP 8.0 and 8.1, but also 7.4)

Issue: https://github.com/php/php-src/issues/8159 Comment Author: unix-world Differences between PHP 7.3.33 and 8.0.16 in ext/opcache/ZendAccelerator.c that may cause the crashing issue: in PHP 8.0.16 (crashing) there is: ``` zend_result accel_post_deactivate(void) { if (ZCG(cwd)) { zend_string_release_ex(ZCG(cwd), 0); ZCG(cwd) = NULL; } if (!ZCG(enabled) || !accel_startup_ok) { return SUCCESS; } zend_shared_alloc_safe_unlock(); /* be sure we didn't leave cache locked */ accel_unlock_all(); ZCG(counted) = 0; return SUCCESS; } ``` in PHP 7.3.33 (not crashing) ``` int accel_post_deactivate(void) { if (!ZCG(enabled) || !accel_startup_ok) { return SUCCESS; } zend_shared_alloc_safe_unlock(); /* be sure we didn't leave cache locked */ accel_unlock_all(); ZCG(counted) = 0; return SUCCESS; } ``` In my opinion (not sure yet) somewhere at these lines the crash is producing for PHP 8.0.16, perhaps in some circumstances cwd is NULL somehow ...: ``` if (ZCG(cwd)) { zend_string_release_ex(ZCG(cwd), 0); ZCG(cwd) = NULL; } ```