PHP bypass Rust destructors when `zend_bailout`

[ptondereau]

Description

From discord discussion:

_emalloc will call zend_bailout should PHP's memory limit be reached. In the background, this will do a long jump bypassing any Rust destructors (effectively not freeing memory).

We would simply end up intercepting the bailout (like here: https://gist.github.com/awons/d87db73d1ad5eae1445b9de7e3727c6a) and then panicking. But that panic needs to be caught before it crosses the FFI boundary. And then, in C we would need to again bail to make sure the OOM works as it should.

Long jump located here

Steps to Reproduce

https://github.com/ptondereau/php-rust-bailout-repro

Affected Components

• ext-php-rs
• macros
• cli (cargo-php)

PHP Version

Every PHP version

ext-php-rs Version

every

Operating System

every

[Xenira]

Thanks for the reproduction repo. Really helpful.

[ptondereau]

Thanks for the reproduction repo. Really helpful.

Be aware that it's old and maybe inaccurate