[php-src] Issue #22086: JIT bug: composer install sometimes hangs

Issue: https://github.com/php/php-src/issues/22086 Author: ondrejmirtes ### Description composer install sometimes hangs when JIT is on and set to tracing. I created a reproducing repo that shows the problem: https://github.com/ondrejmirtes/composer-hang-repro Disclaimer: Claude Code helped me create the reproducer. The repo contains two Dockerfiles (with JIT on/off) that shows the difference in behaviour and loop.sh script that runs composer install over and over and shows that it hangs in about 3 % of performed runs. There are some details in the README but consider them with a grain of salt. To reproduce the problem in the cloned link repository: # Build both images (PHP 8.5.6 + Composer 2.9.5) docker build -t composer-jit-hang -f Dockerfile.jit . docker build -t composer-jit-nojit -f Dockerfile.nojit . # 1) See the hang with opcache.jit=tracing. # loop.sh bootstraps vendor/ on first run (one ~30 s install to bring in # Symfony Flex, which has to be loaded as a plugin for the JIT bug to # fire), then runs composer install --dry-run 200 times. Expect a # handful of those runs to be killed at the 15 s deadline — last # measurement: 19 hangs in 500 runs. docker run --rm \ -v "$PWD":/work \ composer-jit-hang bash /loop.sh 200 # 2) Same project, same Composer, same PHP, JIT off — zero hangs. docker run --rm \ -v "$PWD":/work \ composer-jit-nojit bash /loop.sh 200 ``` ### PHP Version ```plain PHP 8.5.6 (cli) (built: May 8 2026 19:23:57) (NTS) Copyright (c) The PHP Group Built by https://github.com/docker-library/php ``` ### Operating System Debian 13.4