Comment # 5 on bug 1171718 from Martin Tessun

So after some issue (systemd-coredump wasn't installed), I have a coredump now
- generated by simply doing systemctl reload apache2.

Some info:
$ sudo coredumpctl info --no-pager
           PID: 2508 (httpd-prefork)
           UID: 0 (root)
           GID: 0 (root)
        Signal: 11 (SEGV)
     Timestamp: Mon 2020-05-18 09:56:32 CEST (1min 7s ago)
  Command Line: /usr/sbin/httpd-prefork -DSYSCONFIG -DSSL -DMAILMAN -C PidFile
/var/run/httpd.pid -C Include /etc/apache2/sysconfig.d//loadmodule.conf -C
Include /etc/apache2/sysconfig.d//global.conf -f /etc/apache2/httpd.conf -c
Include /etc/apache2/sysconfig.d//include.conf -DSYSTEMD -DFOREGROUND -k start
    Executable: /usr/sbin/httpd-prefork
 Control Group: /system.slice/apache2.service
          Unit: apache2.service
         Slice: system.slice
       Boot ID: 41a42121e7ef4b7d897b86f7f9822193
    Machine ID: 7c3295350327427ba15bc55d628df838
      Hostname: <host>
       Storage:
/var/lib/systemd/coredump/core.httpd-prefork.0.41a42121e7ef4b7d897b86f7f9822193.2508.1589788592000000.lz4
       Message: Process 2508 (httpd-prefork) of user 0 dumped core.

                Stack trace of thread 2508:
                #0  0x00007f42aa95c6ff zend_hash_destroy (mod_php7.so)
                #1  0x00007f42aa940a9c destroy_zend_class (mod_php7.so)
                #2  0x00007f42aa95c6d5 zend_hash_destroy (mod_php7.so)
                #3  0x00007f42aa94c1f6 n/a (mod_php7.so)
                #4  0x00007f42aa8dff92 php_module_shutdown (mod_php7.so)
                #5  0x00007f42aa8e0049 php_module_shutdown_wrapper
(mod_php7.so)
                #6  0x00007f42aa9e2b91 n/a (mod_php7.so)
                #7  0x00007f42b028f9ee apr_pool_clear (libapr-1.so.0)
                #8  0x000055eed977c952 n/a (httpd-prefork)
                #9  0x000055eed977c2dc n/a (httpd-prefork)
                #10 0x00007f42afcba34a __libc_start_main (libc.so.6)
                #11 0x000055eed977c57a _start (httpd-prefork)

So this looks like mod_php7 is causing the crash during reload in the
module_shutdown code.
If the complete core is needed or specific information besides the backtrace is
needed, let me know.