[php-src] Issue #19125: PHP-FPM segfault in OPcache with PHP 8.4.10

Issue: https://github.com/php/php-src/issues/19125 Author: villermen ### Description Our PHP-FPM crashes at seemingly random moments with an error in OPcache. I am unable to reproduce this locally but have made coredumps on production. They seem to result in 2 distinct backtraces that seem to point to the same error: ``` [New LWP 46774] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `php-fpm: pool www '. Program terminated with signal SIGSEGV, Segmentation fault. (gdb) bt #0 0x00007f596e4f5b91 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #1 0x00007f596e4f72c9 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #2 0x00007f596e4f7db0 in zend_file_cache_script_store () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #3 0x00007f596e50a880 in persistent_compile_file () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #4 0x000055afdce6ea46 in compile_filename () #5 0x000055afdce01580 in ?? () #6 0x000055afdce0f689 in ?? () #7 0x000055afdce3bb0d in execute_ex () #8 0x000055afdce39f83 in zend_execute () #9 0x000055afdcea1a40 in zend_execute_script () #10 0x000055afdcd3f085 in php_execute_script_ex () #11 0x000055afdca09a5a in ?? () #12 0x00007f59715b624a in __libc_start_call_main (main=main@entry=0x55afdca08d10, argc=argc@entry=2, argv=argv@entry=0x7ffe5eb3ef78) at ../sysdeps/nptl/libc_start_call_main.h:58 #13 0x00007f59715b6305 in __libc_start_main_impl (main=0x55afdca08d10, argc=2, argv=0x7ffe5eb3ef78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe5eb3ef68) at ../csu/libc-start.c:360 #14 0x000055afdca0ba31 in _start () ``` ``` Program terminated with signal SIGSEGV, Segmentation fault. (gdb) bt #0 0x00007f596e4f5b91 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #1 0x00007f596e4f72c9 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #2 0x00007f596e4f5cb5 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #3 0x00007f596e4f64d0 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #4 0x00007f596e4f5cb5 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #5 0x00007f596e4f7d82 in zend_file_cache_script_store () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #6 0x00007f596e50a880 in persistent_compile_file () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/opcache.so #7 0x000055afdce6ea46 in compile_filename () #8 0x000055afdce01580 in ?? () #9 0x000055afdce0f689 in ?? () #10 0x000055afdce3bb0d in execute_ex () #11 0x000055afdcdeb0cd in zend_call_function () #12 0x000055afdcdeb4dd in zend_call_known_function () #13 0x000055afdcc61f86 in ?? () #14 0x00007f596cc2564b in tideways_hooks_perform_autoload () from /usr/local/lib/php/extensions/no-debug-non-zts-20240924/tideways.so #15 0x000055afdcdea31e in zend_lookup_class_ex () #16 0x000055afdcdeb8e0 in zend_fetch_class_by_name () #17 0x000055afdce0cde7 in ?? () #18 0x000055afdce3bcd4 in execute_ex () #19 0x000055afdce39f83 in zend_execute () #20 0x000055afdcea1a40 in zend_execute_script () #21 0x000055afdcd3f085 in php_execute_script_ex () #22 0x000055afdca09a5a in ?? () #23 0x00007f59715b624a in __libc_start_call_main (main=main@entry=0x55afdca08d10, argc=argc@entry=2, argv=argv@entry=0x7ffe5eb3ef78) at ../sysdeps/nptl/libc_start_call_main.h:58 #24 0x00007f59715b6305 in __libc_start_main_impl (main=0x55afdca08d10, argc=2, argv=0x7ffe5eb3ef78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe5eb3ef68) at ../csu/libc-start.c:360 #25 0x000055afdca0ba31 in _start () ``` I am out of my league in debugging this myself, and there's little I can change to the setup to narrow it down. Hopefully the backtraces help. If there's any additional context or hint of reproduction steps I can try please let me know. ### PHP Version ```plain PHP 8.4.10 (cli) (built: Jul 3 2025 22:57:54) (NTS) Copyright (c) The PHP Group Built by https://github.com/docker-library/php Zend Engine v4.4.10, Copyright (c) Zend Technologies with Zend OPcache v8.4.10, Copyright (c), by Zend Technologies ``` ### Operating System _No response_