Segmentation fault @ PHP 8.1

[b1rdex]

Q	A
PHPUnit version	9.5.10
PHP version	8.1.1
Installation Method	Composer

Summary

We have some code that worked without any issues on PHP 8.0, but it's failing with a segmentation fault on 8.1.
I'm not sure whether it's a PHPUnit or PHP issue... So please see the code. Mock creation triggers the problem.

Current behavior

Segmentation fault.

How to reproduce

Test repo: https://github.com/b1rdex/php-8.1-segfault

Expected behavior

No problem :)

[sebastianbergmann]

You have found a problem in the PHP runtime that leads to a segmentation fault. An issue like this has to be reported here using a minimal, self-contained, reproducing test case.

Please note that a test case that needs to be run through PHPUnit does not qualify as either "minimal" or "self-contained" when reporting bugs for the PHP runtime. Best practices for reporting bugs in PHP are documented here.

[b1rdex]

I reported it here because I'm not sure that it's just a PHP issue. Mock creation is failing only in the data provider – creating it in a test works fine. Anyway, I've reported it to PHP – php/php-src#7809. Let's see how it goes.

[cmb69]

While there are cases where userland code can trigger a segfault due to stack overflow, a null pointer dereference is always a bug in PHP. However, I have to admit that this mockery stretches what PHP has to handle. :)

[DragosMocrii]

Ran into a similar issue and spent the evening trying to understand what happened (PHP 8.2, PHPUnit 10.3). Turns out it was because I was mocking a class that had a __destruct method, which was calling a public method as last statement: https://dragoshmocrii.com/php-and-phpunit-process-finished-with-exit-code-139-interrupted-by-signal-11-sigsegv/

I believe that the cause of the segfault is null pointer dereferencing, but can't put my finger on it.

[b1rdex]

@DragosMocrii please create a minimal reproduction and report to https://github.com/php/php-src/

[DragosMocrii]

@b1rdex just did! php/php-src#12373