Apache / PHP segfaults (PHP 8.0 and 8.1, but also 7.4)

[unix-world]

Description

PHP 7.4.27 / 8.0.15 / 8.1.3
Apache 2.4.52
OpenBSD 7.0 / amd64

If running any of the above PHP versions under Apache (as module), I noticed that every time when apache rotate it's logs it crashes. To be sure of this issue I set the log rotation at a fixed hour (not by size).
In the last 3 days, each day at the exactly same hour apache crashed and did not crashed in the rest.
Finally I did not loaded the opcache.so and it did not crashed on log rotation.
After further investigation I noticed this:

The problem is somwehere in opcache.so.
All the above versions are affected.
The PHP 7.3.33 works OK, it does not crash.

How to reproduce the issue:

1. load the opcache.so PHP extensions
2. apachectl2 graceful OR kill -HUP 12345 (where 12345 is the process ID number)
3. apache crashes

If I do not load opcache.so it does not crashes.

PHP Version

8.0.15

Operating System

OpenBSD 7.0

[devnexen]

a backtrace would help, if I recall correctly, openbsd tends to generate a coredump as <process name>.core (so php.core most likely here) where the said process had been called. What might help further in your case eventually is to write to ports@openbsd.org so they might help you generate a version with debug symbols so we can get more useful informations. And maybe opcache settings.

[unix-world]

There is no php.core, only httpd2.core. I tried looking but there are not enough debug symbols within ... perhaps need a binary package with DEBUG=on ...
The opcache settings I excluded since I can switch between PHP 7.3.33 / 7.4.27 / 8.0.15 / 8.1.2 and with the same opcache settings the PHP 7.3.33 is not crashing apache.

This crash is very weird.
If I do 'rcctl restart apache2' it does not crash ... (this is like in linux: systemctl restart apache2'
If I do kill -HUP 12345 (where 12345 is the process ID number) it crashes with a core dump, but only with PHP 7.4 / 8.0 / 8.1 and not with 7.3 ! ... (and only if opcache is loaded as a PHP extension, not in the rest).

[unix-world]

This is the output of GDB

gdb /usr/local/sbin/httpd2 /httpd2.core

GNU gdb 6.3
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "amd64-unknown-openbsd7.0"...(no debugging symbols found)

Core was generated by `httpd2'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libpthread.so.26.1...done.
Loaded symbols for /usr/lib/libpthread.so.26.1
Loaded symbols for /usr/local/sbin/httpd2
Reading symbols from /usr/local/lib/libpcre.so.3.0...done.
Loaded symbols for /usr/local/lib/libpcre.so.3.0
Reading symbols from /usr/local/lib/libaprutil-1.so.6.1...done.
Loaded symbols for /usr/local/lib/libaprutil-1.so.6.1
Symbols already loaded for /usr/lib/libpthread.so.26.1
Reading symbols from /usr/lib/libexpat.so.14.0...done.
Loaded symbols for /usr/lib/libexpat.so.14.0
Reading symbols from /usr/local/lib/libiconv.so.7.0...done.
Loaded symbols for /usr/local/lib/libiconv.so.7.0
Reading symbols from /usr/local/lib/libapr-1.so.7.0...done.
Loaded symbols for /usr/local/lib/libapr-1.so.7.0
Reading symbols from /usr/local/lib/libdb.so.5.0...done.
Loaded symbols for /usr/local/lib/libdb.so.5.0
Reading symbols from /usr/lib/libc.so.96.1...done.
Loaded symbols for /usr/lib/libc.so.96.1
Reading symbols from /usr/libexec/ld.so...Error while reading shared library symbols:
Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/libexec/ld.so]
Reading symbols from /usr/local/lib/php-7.4/modules/opcache.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/opcache.so
Reading symbols from /usr/local/lib/apache2/mod_authn_file.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_authn_file.so
Reading symbols from /usr/local/lib/apache2/mod_authn_core.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_authn_core.so
Reading symbols from /usr/local/lib/apache2/mod_authz_host.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_authz_host.so
Reading symbols from /usr/local/lib/apache2/mod_authz_user.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_authz_user.so
Reading symbols from /usr/local/lib/apache2/mod_authz_core.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_authz_core.so
Reading symbols from /usr/local/lib/apache2/mod_access_compat.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_access_compat.so
Reading symbols from /usr/local/lib/apache2/mod_auth_basic.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_auth_basic.so
Reading symbols from /usr/local/lib/apache2/mod_auth_digest.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_auth_digest.so
Reading symbols from /usr/local/lib/apache2/mod_allowmethods.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_allowmethods.so
Reading symbols from /usr/local/lib/apache2/mod_file_cache.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_file_cache.so
Reading symbols from /usr/local/lib/apache2/mod_cache.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_cache.so
Reading symbols from /usr/local/lib/apache2/mod_cache_disk.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_cache_disk.so
Reading symbols from /usr/local/lib/apache2/mod_cache_socache.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_cache_socache.so
Reading symbols from /usr/local/lib/apache2/mod_socache_shmcb.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_socache_shmcb.so
Reading symbols from /usr/local/lib/apache2/mod_socache_memcache.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_socache_memcache.so
Reading symbols from /usr/local/lib/apache2/mod_buffer.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_buffer.so
Reading symbols from /usr/local/lib/apache2/mod_reqtimeout.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_reqtimeout.so
Reading symbols from /usr/local/lib/apache2/mod_request.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_request.so
Reading symbols from /usr/local/lib/apache2/mod_include.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_include.so
Reading symbols from /usr/local/lib/apache2/mod_filter.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_filter.so
Reading symbols from /usr/local/lib/apache2/mod_deflate.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_deflate.so
Reading symbols from /usr/lib/libz.so.6.0...done.
Loaded symbols for /usr/lib/libz.so.6.0
Reading symbols from /usr/local/lib/apache2/mod_mime.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_mime.so
Reading symbols from /usr/local/lib/apache2/mod_log_config.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_log_config.so
Reading symbols from /usr/local/lib/apache2/mod_env.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_env.so
Reading symbols from /usr/local/lib/apache2/mod_mime_magic.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_mime_magic.so
Reading symbols from /usr/local/lib/apache2/mod_expires.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_expires.so
Reading symbols from /usr/local/lib/apache2/mod_headers.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_headers.so
Reading symbols from /usr/local/lib/apache2/mod_unique_id.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_unique_id.so
Reading symbols from /usr/local/lib/apache2/mod_setenvif.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_setenvif.so
Reading symbols from /usr/local/lib/apache2/mod_version.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_version.so
Reading symbols from /usr/local/lib/apache2/mod_session.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_session.so
Reading symbols from /usr/local/lib/apache2/mod_ssl.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_ssl.so
Reading symbols from /usr/lib/libssl.so.50.0...done.
Loaded symbols for /usr/lib/libssl.so.50.0
Reading symbols from /usr/lib/libcrypto.so.47.0...done.
Loaded symbols for /usr/lib/libcrypto.so.47.0
Reading symbols from /usr/local/lib/apache2/mod_mpm_prefork.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_mpm_prefork.so
Reading symbols from /usr/local/lib/apache2/mod_unixd.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_unixd.so
Reading symbols from /usr/local/lib/apache2/mod_dav.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_dav.so
Reading symbols from /usr/local/lib/apache2/mod_status.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_status.so
Reading symbols from /usr/local/lib/apache2/mod_autoindex.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_autoindex.so
Reading symbols from /usr/local/lib/apache2/mod_dav_fs.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_dav_fs.so
Reading symbols from /usr/local/lib/apache2/mod_dav_lock.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_dav_lock.so
Reading symbols from /usr/local/lib/apache2/mod_vhost_alias.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_vhost_alias.so
Reading symbols from /usr/local/lib/apache2/mod_negotiation.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_negotiation.so
Reading symbols from /usr/local/lib/apache2/mod_dir.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_dir.so
Reading symbols from /usr/local/lib/apache2/mod_alias.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_alias.so
Reading symbols from /usr/local/lib/apache2/mod_rewrite.so...done.
Loaded symbols for /usr/local/lib/apache2/mod_rewrite.so
Reading symbols from /usr/local/lib/php-7.4/libphp7.so...done.
Loaded symbols for /usr/local/lib/php-7.4/libphp7.so
Reading symbols from /usr/local/lib/libargon2.so.0.0...done.
Loaded symbols for /usr/local/lib/libargon2.so.0.0
Reading symbols from /usr/lib/libreadline.so.4.0...done.
Loaded symbols for /usr/lib/libreadline.so.4.0
Reading symbols from /usr/lib/libcurses.so.14.0...done.
Loaded symbols for /usr/lib/libcurses.so.14.0
Reading symbols from /usr/local/lib/libintl.so.7.0...done.
Loaded symbols for /usr/local/lib/libintl.so.7.0
Reading symbols from /usr/lib/libm.so.10.1...done.
Loaded symbols for /usr/lib/libm.so.10.1
Reading symbols from /usr/local/lib/libonig.so.7.2...done.
Loaded symbols for /usr/local/lib/libonig.so.7.2
Reading symbols from /usr/local/lib/libsqlite3.so.37.15...done.
Loaded symbols for /usr/local/lib/libsqlite3.so.37.15
Reading symbols from /usr/local/lib/libxml2.so.17.0...done.
Loaded symbols for /usr/local/lib/libxml2.so.17.0
Reading symbols from /usr/local/lib/liblzma.so.2.1...done.
Loaded symbols for /usr/local/lib/liblzma.so.2.1
Reading symbols from /usr/local/lib/php-7.4/modules/bz2.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/bz2.so
Reading symbols from /usr/local/lib/libbz2.so.10.4...done.
Loaded symbols for /usr/local/lib/libbz2.so.10.4
Reading symbols from /usr/local/lib/php-7.4/modules/curl.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/curl.so
Reading symbols from /usr/local/lib/libcurl.so.26.13...done.
Loaded symbols for /usr/local/lib/libcurl.so.26.13
Reading symbols from /usr/local/lib/libnghttp2.so.0.18...done.
Loaded symbols for /usr/local/lib/libnghttp2.so.0.18
Reading symbols from /usr/local/lib/php-7.4/modules/dba.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/dba.so
Reading symbols from /usr/local/lib/libgdbm.so.7.0...done.
Loaded symbols for /usr/local/lib/libgdbm.so.7.0
Reading symbols from /usr/local/lib/php-7.4/modules/gd.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/gd.so
Reading symbols from /usr/local/lib/libpng.so.18.0...done.
Loaded symbols for /usr/local/lib/libpng.so.18.0
Reading symbols from /usr/local/lib/libwebp.so.4.3...done.
Loaded symbols for /usr/local/lib/libwebp.so.4.3
Reading symbols from /usr/local/lib/libjpeg.so.70.0...done.
Loaded symbols for /usr/local/lib/libjpeg.so.70.0
Reading symbols from /usr/X11R6/lib/libfreetype.so.30.0...done.
Loaded symbols for /usr/X11R6/lib/libfreetype.so.30.0
Reading symbols from /usr/local/lib/php-7.4/modules/gmp.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/gmp.so
Reading symbols from /usr/local/lib/libgmp.so.11.0...done.
Loaded symbols for /usr/local/lib/libgmp.so.11.0
Reading symbols from /usr/local/lib/php-7.4/modules/intl.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/intl.so
Reading symbols from /usr/local/lib/libicuio.so.20.0...done.
Loaded symbols for /usr/local/lib/libicuio.so.20.0
Reading symbols from /usr/local/lib/libicui18n.so.20.0...done.
Loaded symbols for /usr/local/lib/libicui18n.so.20.0
Reading symbols from /usr/local/lib/libicuuc.so.20.0...done.
Loaded symbols for /usr/local/lib/libicuuc.so.20.0
Reading symbols from /usr/local/lib/libicudata.so.20.0...done.
Loaded symbols for /usr/local/lib/libicudata.so.20.0
Reading symbols from /usr/lib/libc++.so.8.0...done.
Loaded symbols for /usr/lib/libc++.so.8.0
Reading symbols from /usr/lib/libc++abi.so.5.0...done.
Loaded symbols for /usr/lib/libc++abi.so.5.0
Reading symbols from /usr/local/lib/php-7.4/modules/mongodb.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/mongodb.so
Reading symbols from /usr/lib/libtls.so.22.0...done.
Loaded symbols for /usr/lib/libtls.so.22.0
Reading symbols from /usr/local/lib/php-7.4/modules/mysqli.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/mysqli.so
Reading symbols from /usr/local/lib/php-7.4/modules/pdo_mysql.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/pdo_mysql.so
Reading symbols from /usr/local/lib/php-7.4/modules/pdo_pgsql.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/pdo_pgsql.so
Reading symbols from /usr/local/lib/libpq.so.6.10...done.
Loaded symbols for /usr/local/lib/libpq.so.6.10
Reading symbols from /usr/local/lib/php-7.4/modules/pgsql.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/pgsql.so
Reading symbols from /usr/local/lib/php-7.4/modules/zip.so...done.
Loaded symbols for /usr/local/lib/php-7.4/modules/zip.so
Reading symbols from /usr/local/lib/libzip.so.4.1...done.
Loaded symbols for /usr/local/lib/libzip.so.4.1
#0 0x00000ce72b51aeb0 in ?? ()

There is nothing more ... in the GDB output !

[unix-world]

Also maybe this can help you:

(gdb) list
1 /usr/src/lib/libtls/tls.c: No such file or directory.
in /usr/src/lib/libtls/tls.c
(gdb) info locals
No symbol table info available.
(gdb) bt
#0 0x000008f23da53eb0 in ?? ()
#1 0x000008f2ef2029e7 in accel_startup () from /usr/local/lib/php-7.4/modules/opcache.so
#2 0x000008f2931d9126 in zend_extension_startup () from /usr/local/lib/php-7.4/libphp7.so
#3 0x000008f2931bbf59 in zend_llist_apply_with_del () from /usr/local/lib/php-7.4/libphp7.so
#4 0x000008f2931d90e5 in zend_startup_extensions () from /usr/local/lib/php-7.4/libphp7.so
#5 0x000008f29315039e in php_module_startup () from /usr/local/lib/php-7.4/libphp7.so
#6 0x000008f293275853 in php_apache2_startup () from /usr/local/lib/php-7.4/libphp7.so
#7 0x000008f2932750e7 in php_apache_server_startup () from /usr/local/lib/php-7.4/libphp7.so
#8 0x000008f02f5b4955 in ap_run_post_config () from /usr/local/sbin/httpd2
#9 0x000008f02f5b36a5 in main () from /usr/local/sbin/httpd2
(gdb)

[unix-world]

(gdb) bt full
#0 0x000008f23da53eb0 in ?? ()
No symbol table info available.
#1 0x000008f2ef2029e7 in accel_startup () from /usr/local/lib/php-7.4/modules/opcache.so
No symbol table info available.
#2 0x000008f2931d9126 in zend_extension_startup () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#3 0x000008f2931bbf59 in zend_llist_apply_with_del () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#4 0x000008f2931d90e5 in zend_startup_extensions () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#5 0x000008f29315039e in php_module_startup () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#6 0x000008f293275853 in php_apache2_startup () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#7 0x000008f2932750e7 in php_apache_server_startup () from /usr/local/lib/php-7.4/libphp7.so
No symbol table info available.
#8 0x000008f02f5b4955 in ap_run_post_config () from /usr/local/sbin/httpd2
No symbol table info available.
#9 0x000008f02f5b36a5 in main () from /usr/local/sbin/httpd2
No symbol table info available.

[unix-world]

Even if i use just this in opcache.ini
zend_extension=opcache.so

or if I use:
zend_extension=opcache.so
opcache.enable = 1
opcache.enable_cli = 0
opcache.memory_consumption = 512
opcache.interned_strings_buffer = 16
opcache.max_accelerated_files = 5000
opcache.max_wasted_percentage = 5
opcache.use_cwd = 1
opcache.validate_timestamps = 1
opcache.revalidate_freq = 2
opcache.revalidate_path = 0
opcache.save_comments = 0
opcache.load_comments = 0
opcache.fast_shutdown = 0
opcache.enable_file_override = 0
;opcache.optimization_level = 0x00000000
opcache.inherited_hack = 1
opcache.blacklist_filename = ""
opcache.max_file_size = 0
opcache.consistency_checks = 0
opcache.force_restart_timeout = 180
opcache.error_log = "/var/log/apache2/php-opcache-errors.log"
opcache.log_verbosity_level = 1
opcache.preferred_memory_model = ""
opcache.protect_memory = 0

It crashes with any of these configs (default or custom) for opcache.ini ...
This opcache.ini I am using since many years and worked OK.
I recently turned on PHP 7.4 and I noticed this crash.
Since I am able to still test this crash also with PHP 7.3 it does not crashes but only crashes with 7.4 / 8.0 / 8.1 if opcache.so is loaded :-(

[unix-world]

Core

PHP Version	7.4.27

Core
PHP Version 7.4.27
Directive Local Value Master Value
allow_url_fopen Off Off
allow_url_include Off Off
arg_separator.input & &
arg_separator.output & &
auto_append_file no value no value
auto_globals_jit On On
auto_prepend_file no value no value
browscap no value no value
default_charset UTF-8 UTF-8
default_mimetype text/html text/html
disable_classes no value no value
disable_functions no value no value
display_errors Off Off
display_startup_errors Off Off
doc_root no value no value
docref_ext no value no value
docref_root no value no value
enable_dl Off Off
enable_post_data_reading On On
error_append_string no value no value
error_log no value no value
error_prepend_string no value no value
error_reporting 22527 22527
expose_php On On
extension_dir /usr/local/lib/php-7.4/modules /usr/local/lib/php-7.4/modules
file_uploads On On
hard_timeout 2 2
highlight.comment #FF8000 #FF8000
highlight.default #0000BB #0000BB
highlight.html #000000 #000000
highlight.keyword #7700 #7700
highlight.string #DD0000 #DD0000
html_errors On On
ignore_repeated_errors Off Off
ignore_repeated_source Off Off
ignore_user_abort Off Off
implicit_flush Off Off
include_path .:/pear/lib:/var/www/pear/lib .:/pear/lib:/var/www/pear/lib
input_encoding no value no value
internal_encoding no value no value
log_errors On On
log_errors_max_len 1024 1024
mail.add_x_header Off Off
mail.force_extra_parameters no value no value
mail.log no value no value
max_execution_time 30 30
max_file_uploads 20 20
max_input_nesting_level 64 64
max_input_time 60 60
max_input_vars 1000 1000
memory_limit 256M 256M
open_basedir no value no value
output_buffering 4096 4096
output_encoding no value no value
output_handler no value no value
post_max_size 178M 178M
precision 14 14
realpath_cache_size 4096K 4096K
realpath_cache_ttl 120 120
register_argc_argv Off Off
report_memleaks On On
report_zend_debug On On
request_order GP GP
sendmail_from no value no value
sendmail_path /usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
serialize_precision -1 -1
short_open_tag Off Off
SMTP localhost localhost
smtp_port 25 25
sys_temp_dir no value no value
syslog.facility LOG_USER LOG_USER
syslog.filter no-ctrl no-ctrl
syslog.ident php php
track_errors Off Off
unserialize_callback_func no value no value
upload_max_filesize 172M 172M
upload_tmp_dir no value no value
user_dir no value no value
user_ini.cache_ttl 300 300
user_ini.filename .user.ini .user.ini
variables_order GPCS GPCS
xmlrpc_error_number 0 0
xmlrpc_errors Off Off
zend.assertions -1 -1
zend.detect_unicode On On
zend.enable_gc On On
zend.exception_ignore_args On On
zend.multibyte Off Off
zend.script_encoding no value no value
zend.signal_check Off Off

[unix-world]

pcre

PCRE (Perl Compatible Regular Expressions) Support	enabled
PCRE Library Version	10.35 2020-05-09
PCRE Unicode Version	13.0.0
PCRE JIT Support	not compiled in

pcre
PCRE (Perl Compatible Regular Expressions) Support enabled
PCRE Library Version 10.35 2020-05-09
PCRE Unicode Version 13.0.0
PCRE JIT Support not compiled in

[unix-world]

Zend OPcache

Opcode Caching	Up and Running
Optimization	Enabled
SHM Cache	Enabled
File Cache	Disabled
Startup	OK
Shared memory model	mmap
Cache hits	0
Cache misses	1
Used memory	17160440
Free memory	519710472
Wasted memory	0
Interned Strings Used memory	387632
Interned Strings Free memory	12194832
Cached scripts	1
Cached keys	2
Max keys	7963
OOM restarts	0
Hash keys restarts	0
Manual restarts	0

Zend OPcache
Opcode Caching Up and Running
Optimization Enabled
SHM Cache Enabled
File Cache Disabled
Startup OK
Shared memory model mmap
Cache hits 0
Cache misses 1
Used memory 17160440
Free memory 519710472
Wasted memory 0
Interned Strings Used memory 387632
Interned Strings Free memory 12194832
Cached scripts 1
Cached keys 2
Max keys 7963
OOM restarts 0
Hash keys restarts 0
Manual restarts 0
Directive Local Value Master Value
opcache.blacklist_filename no value no value
opcache.consistency_checks 0 0
opcache.dups_fix Off Off
opcache.enable On On
opcache.enable_cli Off Off
opcache.enable_file_override Off Off
opcache.error_log /var/log/apache2/php-opcache-errors.log /var/log/apache2/php-opcache-errors.log
opcache.file_cache no value no value
opcache.file_cache_consistency_checks On On
opcache.file_cache_only Off Off
opcache.file_update_protection 2 2
opcache.force_restart_timeout 180 180
opcache.huge_code_pages Off Off
opcache.interned_strings_buffer 16 16
opcache.lockfile_path /tmp /tmp
opcache.log_verbosity_level 1 1
opcache.max_accelerated_files 5000 5000
opcache.max_file_size 0 0
opcache.max_wasted_percentage 5 5
opcache.memory_consumption 512 512
opcache.opt_debug_level 0 0
opcache.optimization_level 0x7FFEBFFF 0x7FFEBFFF
opcache.preferred_memory_model no value no value
opcache.preload no value no value
opcache.preload_user no value no value
opcache.protect_memory Off Off
opcache.restrict_api no value no value
opcache.revalidate_freq 2 2
opcache.revalidate_path Off Off
opcache.save_comments Off Off
opcache.use_cwd On On
opcache.validate_permission Off Off
opcache.validate_root Off Off
opcache.validate_timestamps On On

[unix-world]

The only difference I see between
rcctl restart apache2 (not crashing)
and
kill -HUP 12345 (crashing)
is in errors.log as:

restarting via rcctl says in log: caught SIGWINCH, shutting down gracefully
(ok, not crashing)

but with kill -HUP says in log:
SIGHUP received. Attempting to restart
(in this situation is crashing all the time ...)

[devnexen]

(gdb) bt full #0 0x000008f23da53eb0 in ?? () No symbol table info available. #1 0x000008f2ef2029e7 in accel_startup () from /usr/local/lib/php-7.4/modules/opcache.so No symbol table info available. #2 0x000008f2931d9126 in zend_extension_startup () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #3 0x000008f2931bbf59 in zend_llist_apply_with_del () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #4 0x000008f2931d90e5 in zend_startup_extensions () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #5 0x000008f29315039e in php_module_startup () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #6 0x000008f293275853 in php_apache2_startup () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #7 0x000008f2932750e7 in php_apache_server_startup () from /usr/local/lib/php-7.4/libphp7.so No symbol table info available. #8 0x000008f02f5b4955 in ap_run_post_config () from /usr/local/sbin/httpd2 No symbol table info available. #9 0x000008f02f5b36a5 in main () from /usr/local/sbin/httpd2 No symbol table info available.

thanks however would be best to focus on PHP 8.x, as said in another ticket PHP 7.4 is no longer supported.