[jvoisin]

Poison freed small slots, page runs, and retained request-shutdown storage. Unpoison storage on allocation, reuse, and realloc growth.

Temporarily expose free-list metadata during allocator accesses, including post-fork rekeying. Keep debug trailers accessible for leak detection.

Add regression coverage for ASan shadow state across allocation, reallocation, freeing, GC, rekeying, and heap reuse. Document how to run ASan tests with native ZendMM.

[jvoisin]

  Run make -C docs check-formatting
  make -C docs check-formatting
  shell: /usr/bin/bash -e {0}
make: Entering directory '/home/runner/work/php-src/php-src/docs'
rstfmt -w 100 --check source
source/miscellaneous/running-tests.rst is not correctly formatted!
make: *** [Makefile:22: check-formatting] Error 1
make: Leaving directory '/home/runner/work/php-src/php-src/docs'
Error: Process completed with exit code 2.

It would be nice of the CI to tell me what's actually wrong with the doc formatting.

[LamentXU123]

You need to make sure every line of the doc to be no more than 100 words to pass doc formatting CI.