Description

The following code:

ExampleEnum.php

<?phpenum ExampleEnum:string{caseFIRST='FIRST_VALUE';}

Trigger.php

<?phpfunctionauxiliarFunction(string$enumEntry) {}functiontriggerException(callable$callback) {$callback();}functionmain() {triggerException(function () {auxiliarFunction(ExampleEnum::FIRST->value);//This will not run and trigger a SIGSEGV - core dumped    });}

This was first spotted on Symfony 5.4 codebase, with a callback of the TagAwareCacheInterface.
If OPCache is disabled, the error doesn't occur.
Replacing the enum with a string variable fixes the issue.

PHP Version

PHP 8.1.11 (fpm-fcgi)

Operating System

Ubuntu 20.04.5 LTS