[php-src] Issue #9633: SIGSEGV Segmentation fault on ARM64

Issue: https://github.com/php/php-src/issues/9633 Author: MauricioFauth ### Description Once in while, the phpMyAdmin's testsuite on ARM64 causes a segmentation fault. For example: - https://github.com/phpmyadmin/phpmyadmin/actions/runs/3130857168/jobs/5081574596#step:6:573 - https://github.com/phpmyadmin/phpmyadmin/actions/runs/3130850431/jobs/5081556935#step:6:580 - https://github.com/phpmyadmin/phpmyadmin/actions/runs/3102363522/jobs/5024589985#step:6:575 I tried to replicate in CI one that I was able to reproduce on my machine, but it passed. - https://github.com/phpmyadmin/phpmyadmin/pull/17738 On my machine the core dump file was not useful, it did not had a backtrace and I wasn't able to use gdb inside Docker. I was able to get a backtrace using a remote gdb, but I don't know if this backtrace is useful. I never used gdb this way. ``` $ sudo docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -i -v $PWD:/app --workdir /app --rm arm64v8/alpine:3.16 sh /app/do-tests.sh + bash qemu-aarch64 -g 1234 ./docker/usr/bin/php8 ./vendor/bin/phpunit --no-coverage --testsuite unit --exclude-group=extension-iconv --random-order-seed 1664232984 --stop-on-failure PHPUnit 9.5.25 #StandWithUkraine Runtime: PHP 8.0.22 Configuration: /app/phpunit.xml Random Seed: 1664232984 Warning: Your XML configuration validates against a deprecated schema. Suggestion: Migrate your XML configuration using "--migrate-configuration"! ............................................................. 61 / 2830 ( 2%) .........S...........S....................................... 122 / 2830 ( 4%) ............................................................. 183 / 2830 ( 6%) ............................................................. 244 / 2830 ( 8%) ............................................................. 305 / 2830 ( 10%) ............................................................. 366 / 2830 ( 12%) ............................................................. 427 / 2830 ( 15%) ............................................................. 488 / 2830 ( 17%) ............................................................. 549 / 2830 ( 19%) .................................qemu-aarch64: QEMU: Terminated via GDBstub ``` ``` $ gdb-multiarch -q --nh -ex 'set architecture aarch64' -ex 'set sysroot docker' -ex 'file docker/usr/bin/php8' -ex 'target remote 172.17.0.2:1234' The target architecture is set to "aarch64". Reading symbols from docker/usr/bin/php8... Reading symbols from docker/usr/lib/debug/usr/bin/php8.debug... Remote debugging using 172.17.0.2:1234 Reading symbols from docker/lib/ld-musl-aarch64.so.1... (No debugging symbols found in docker/lib/ld-musl-aarch64.so.1) 0x00007f56e851f4c0 in _dlstart () from docker/lib/ld-musl-aarch64.so.1 (gdb) continue Continuing. Program received signal SIGSEGV, Segmentation fault. 0x00007f56e82e1050 in ?? () from docker/usr/lib/libpcre2-8.so.0 (gdb) bt #0 0x00007f56e82e1050 in ?? () from docker/usr/lib/libpcre2-8.so.0 #1 0x00007f56da1f9900 in ?? () #2 0x00007f56d9d4c770 in zend_is_callable_ex (callable=0x7f56dbdd3000, object=0x7f56dbdcb000, check_flags=<optimized out>, callable_name=0x7f56d91fffff, fcc=<optimized out>, error=<optimized out>) at /home/buildozer/aports/community/php8/src/php-8.0.22/Zend/zend_API.c:3520 #3 0x00007f56d9d4c770 in zend_is_callable_ex (callable=0x7f56dbe192e0, object=0xf4241, check_flags=<optimized out>, callable_name=0x0, fcc=<optimized out>, error=<optimized out>) at /home/buildozer/aports/community/php8/src/php-8.0.22/Zend/zend_API.c:3520 #4 0x00007f56d91ffff7 in ?? () Backtrace stopped: previous frame inner to this frame (corrupt stack?) (gdb) q ``` Let me know if this backtrace tell something that I could use to isolate the issue. ### PHP Version 8.0.22 ### Operating System Alpine 3.16 arm64v8