Nginx 1.15.5 官方更新日志：
http://nginx.org/en/CHANGES

Changes with nginx 1.15.5                                        02 Oct 2018

    *) Bugfix: a segmentation fault might occur in a worker process when
       using OpenSSL 1.1.0h or newer; the bug had appeared in 1.15.4.

    *) Bugfix: of minor potential bugs.