PHP crashes randomly: plesk-php7X-fpm.service: main process exited, code=dumped, status=11/SEGV

Symptoms

• PHP-FPM 7.0 or 7.2 crashes randomly. The following error appears in /var/log/messages:

  CONFIG_TEXT: plesk.example.com systemd[1]: plesk-php72-fpm.service: main process exited, code=dumped, status=11/SEGV
  plesk.example.com systemd[1]: Unit plesk-php72-fpm.service entered failed state.

• Crash dump contains the following information:

  CONFIG_TEXT: # gdb /root/plesk-support-tmp/php-fpm /var/coredumps/core-php-fpm-sig11-user0-group0-
  ...
  [New LWP 29777]
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib64/libthread_db.so.1".
  Core was generated by `php-fpm: master process (/opt/plesk/php/7.2/et'.
  Program terminated with signal 11, Segmentation fault.
  #0 0x000000000177f17e in ?? ()

Cause

No exact cause. Bugs in PHP 7.0 and 7.2. PHP bug report for both issues https://bugs.php.net/bug.php?id=77114. If you have more details, please add them into the bug thread on php.net

Resolution

There is no solution currently. One of the following can be used as a workaround:

• Change PHP handler to another version.

• Change "Run PHP as" from PHP-FPM to FastCGI.

• Configure systemd service respawn (restart on failure) using the following procedure:

  1. Connect to the server via SSH

  2. Create file 'restart.conf' in systemd service folder with the following content:

     # cat /etc/systemd/system/plesk-php70-fpm.service.d/restart.conf
     [Service]
     Restart=on-failure
     RestartSec=5s

  3. Reload systemd configuration and the service itself:

     # systemctl daemon-reload
     # systemctl restart plesk-php70-fpm