Race conditions on tracing globals in jit-tracing mode in ZTS

Description

While testing opcache.jit=tracing with a threading extension and valgrind --tool=drd, a good number of my extension's tests started detecting race conditions in zend_jit_trace_hot_root and some other places.

I'm seeing races in the following places:
https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_trace.c#L7231
https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_trace.c#L7701
https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_trace.c#L7731
https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_trace.c#L8033
https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_trace.c#L8051

https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit.c#L5096

https://github.com/php/php-src/blob/PHP-8.3.13/ext/opcache/jit/zend_jit_vm_helpers.c#L899

and a few other places

Vast majority seem to have zend_jit_trace_hot_root() in the stack traces

I have a whole bunch of test outputs from my CI if these are any help. Unfortunately the traces are a bit jumbled up in some cases for whatever reason.

Basically it looks like races may occur if two threads try to perform tracing JIT at the same time.

test-results-8.3.13-valgrind-drd-opcache-jit-tracing.zip
from
https://github.com/pmmp/ext-pmmpthread/actions/runs/11915925430/job/33207393626

PHP Version

8.3.13

Operating System

ubuntu-20.04 (GitHub Actions)

Bắt đầu bằng việc xem xét các vị trí được trích dẫn trong ext/opcache/jit/zend_jit_trace.c, zend_jit.c và zend_jit_vm_helpers.c, tập trung vào zend_jit_trace_hot_root và tracing đồng thời. Tái hiện báo cáo với opcache.jit=tracing và valgrind --tool=drd, sử dụng các kết quả kiểm thử được liên kết làm ngữ cảnh. Được coi là hoàn tất khi các race đã báo cáo không còn xảy ra khi nhiều thread thực hiện tracing JIT.