Memory corruption when using JIT

[danog]

Description

Running the https://github.com/amphp/pipeline unit tests on nightly with function or tracing JIT on nightly produces a memory corruption which is not detected by ASAN, which causes runtime "Event loop terminated without resuming the current suspension" exceptions.

The same memory corruption issue occasionally occurs on a production instance running code unrelated to amphp/pipeline on PHP 8.3 with opcache, without JIT (the cause there is likely different, but affecting the same memory area).

Reproducer: https://github.com/danog/jit_bugs/, bugs/14_pipeline.sh

PHP Version

nightly

Operating System

No response

[danog]

Any pointers on what ASAN settings can be tweaked to make it detect the corruption (apart from the standard USE_ZEND_ALLOC=0 et al)?

[nielsdos]

Are you even sure that it's memory corruption in the first place?
I would recommend using Valgrind if you can't reproduce it using ASAN.

[danog]

Positive, since the issue occurs only with JIT, and it can't be a race condition since it's all single-threaded anyway.

Will give valgrind a try!