Description of problem:

Every time when I start php-fpm service occurred follow crash:

$ coredumpctl gdb 18476
           PID: 18476 (php-fpm)
           UID: 0 (root)
           GID: 0 (root)
        Signal: 11 (SEGV)
     Timestamp: Thu 2017-09-14 08:07:57 +05 (8min ago)
  Command Line: /usr/sbin/php-fpm --nodaemonize
    Executable: /usr/sbin/php-fpm
 Control Group: /system.slice/php-fpm.service
          Unit: php-fpm.service
         Slice: system.slice
       Boot ID: bd93057096dd4500987bca1f644fed1d
    Machine ID: 75b6ee13430d4cc7923b3637b296deec
      Hostname: localhost.localdomain
       Storage: /var/lib/systemd/coredump/core.php-fpm.0.bd93057096dd4500987bca1f644fed1d.18476.1505358477000000.lz4 (inaccessible)
       Message: Process 18476 (php-fpm) of user 0 dumped core.
                
                Stack trace of thread 18476:
                #0  0x00007faa21452f5e __pthread_rwlock_init (libpthread.so.0)
                #1  0x00007faa0f285480 apc_lock_create (apcu.so)
                #2  0x00007faa0f289f34 apc_sma_api_init (apcu.so)
                #3  0x00007faa0f2863b7 zm_startup_apcu (apcu.so)
                #4  0x00005556a80eb5a4 zend_startup_module_ex (php-fpm)
                #5  0x00005556a80eb67c zend_startup_module_zval (php-fpm)
                #6  0x00005556a80f902a zend_hash_apply (php-fpm)
                #7  0x00005556a80eb96a zend_startup_modules (php-fpm)
                #8  0x00005556a8083233 php_module_startup (php-fpm)
                #9  0x00005556a8196d55 php_cgi_startup (php-fpm)
                #10 0x00005556a7f5ad70 main (php-fpm)
                #11 0x00007faa21889097 __libc_start_main (libc.so.6)
                #12 0x00005556a7f5c24a _start (php-fpm)

File "/var/lib/systemd/coredump/core.php-fpm.0.bd93057096dd4500987bca1f644fed1d.18476.1505358477000000.lz4" is not readable: Permission denied