Process 205574 (frankenphp) of user 982 dumped core.

        Stack trace of thread 205621:
        #0  0x00005574e193e221 n/a (n/a + 0x0)
        #1  0x00005574e1914c47 n/a (n/a + 0x0)
        #2  0x00005574e19137cd n/a (n/a + 0x0)
        #3  0x00005574e193e529 n/a (n/a + 0x0)
        #4  0x00007f6537c68070 __restore_rt (libc.so.6 + 0x41070)
        #5  0x00007f6537d839c8 __memcpy_avx_unaligned_erms (libc.so.6 + 0x15c9c8)
        #6  0x00007f6538aa8743 zend_stack_push (libphp-zts-84.so + 0x8a8743)
        #7  0x00007f6538922ced php_output_handler_start (libphp-zts-84.so + 0x722ced)
        #8  0x00007f65389246b1 php_output_start_user (libphp-zts-84.so + 0x7246b1)
        #9  0x00007f6538924eac n/a (libphp-zts-84.so + 0x724eac)
        #10 0x00007f6538a4b28a execute_ex (libphp-zts-84.so + 0x84b28a)
        #11 0x00007f65389e99f5 zend_call_function (libphp-zts-84.so + 0x7e99f5)
        #12 0x00007f6538872ca0 n/a (libphp-zts-84.so + 0x672ca0)
        #13 0x00007f6538a5e273 zend_hash_apply (libphp-zts-84.so + 0x85e273)
        #14 0x00007f6538876789 php_call_shutdown_functions (libphp-zts-84.so + 0x676789)
        #15 0x00007f653891d27d php_request_shutdown (libphp-zts-84.so + 0x71d27d)
        #16 0x00005574e2dcabca n/a (n/a + 0x0)
        #17 0x00005574e2dcacdd n/a (n/a + 0x0)
        #18 0x00007f6537cbede5 start_thread (libc.so.6 + 0x97de5)
        #19 0x00007f6537d3198c __clone3 (libc.so.6 + 0x10a98c)

        Stack trace of thread 205574:
        #0  0x00005574e193e7c3 n/a (n/a + 0x0)
        #1  0x00005574e18cce27 n/a (n/a + 0x0)
        #2  0x00005574e19025cc n/a (n/a + 0x0)
        #3  0x00005574e190439c n/a (n/a + 0x0)
        #4  0x00005574e1905411 n/a (n/a + 0x0)
        #5  0x00005574e1905885 n/a (n/a + 0x0)
        #6  0x00005574e193a977 n/a (n/a + 0x0)
        ELF object binary architecture: AMD x86-64

[root@svmdev svm]# php-zts --ini
Configuration File (php.ini) Path: /etc/php-zts
Loaded Configuration File:         /etc/php-zts/php.ini
Scan for additional .ini files in: /etc/php-zts/conf.d
Additional .ini files parsed:      /etc/php-zts/conf.d/15-xdebug.ini,
/etc/php-zts/conf.d/20-gd.ini,
/etc/php-zts/conf.d/20-imagick.ini,
/etc/php-zts/conf.d/20-intl.ini,
/etc/php-zts/conf.d/20-mysqlnd.ini,
/etc/php-zts/conf.d/20-parallel.ini,
/etc/php-zts/conf.d/20-pdo.ini,
/etc/php-zts/conf.d/20-ssh2.ini,
/etc/php-zts/conf.d/30-mysqli.ini,
/etc/php-zts/conf.d/30-pdo_mysql.ini,
/etc/php-zts/conf.d/apcu.ini,
/etc/php-zts/conf.d/ast.ini,
/etc/php-zts/conf.d/bcmath.ini,
/etc/php-zts/conf.d/calendar.ini,
/etc/php-zts/conf.d/ctype.ini,
/etc/php-zts/conf.d/curl.ini,
/etc/php-zts/conf.d/dba.ini,
/etc/php-zts/conf.d/dom.ini,
/etc/php-zts/conf.d/exif.ini,
/etc/php-zts/conf.d/fileinfo.ini,
/etc/php-zts/conf.d/filter.ini,
/etc/php-zts/conf.d/iconv.ini,
/etc/php-zts/conf.d/libxml.ini,
/etc/php-zts/conf.d/mbstring.ini,
/etc/php-zts/conf.d/opcache.ini,
/etc/php-zts/conf.d/openssl.ini,
/etc/php-zts/conf.d/pcntl.ini,
/etc/php-zts/conf.d/phar.ini,
/etc/php-zts/conf.d/posix.ini,
/etc/php-zts/conf.d/readline.ini,
/etc/php-zts/conf.d/session.ini,
/etc/php-zts/conf.d/simplexml.ini,
/etc/php-zts/conf.d/sockets.ini,
/etc/php-zts/conf.d/sodium.ini,
/etc/php-zts/conf.d/tokenizer.ini,
/etc/php-zts/conf.d/xml.ini,
/etc/php-zts/conf.d/xmlreader.ini,
/etc/php-zts/conf.d/xmlwriter.ini,
/etc/php-zts/conf.d/zip.ini,
/etc/php-zts/conf.d/zlib.ini

I don't know when it happened or in response to what, since the service restarted afterwards.