FPM初始化失败

Question

php5-fpm在某些时候没有运行。重新启动php5-fpm后，一切正常，经过一段时间后再次得到（php5-fpm没有运行）错误。

错误日志： -

14-Jul-2014 14:10:00] WARNING: [pool www] child 26439 exited on signal 11 (SIGSEGV - core dumped) after 58.134897 seconds from start
[14-Jul-2014 14:10:00] NOTICE: [pool www] child 26476 started
[14-Jul-2014 14:12:25] WARNING: [pool www] child 26454 exited on signal 11 (SIGSEGV - core dumped) after 203.243227 seconds from start
[14-Jul-2014 14:12:25] NOTICE: [pool www] child 26605 started
[14-Jul-2014 14:18:01] NOTICE: Reloading in progress ...
[14-Jul-2014 14:18:01] NOTICE: reloading: execvp("/usr/sbin/php5-fpm", {"/usr/sbin/php5-fpm", "--fpm-config", "/etc/php5/fpm/php-fpm.conf"})
[14-Jul-2014 14:18:01] NOTICE: PHP message: PHP Warning:  Module 'apc' already loaded in Unknown on line 0
[14-Jul-2014 14:18:01] NOTICE: using inherited socket fd=7, "127.0.0.1:9000"
[14-Jul-2014 14:18:01] NOTICE: using inherited socket fd=7, "127.0.0.1:9000"
[14-Jul-2014 14:18:01] ERROR: epoll: unable to initialize
[14-Jul-2014 14:18:01] ERROR: epoll: unable to initialize
[14-Jul-2014 14:18:01] ERROR: Unable to initialize the event module epoll
[14-Jul-2014 14:18:01] ERROR: Unable to initialize the event module epoll
[14-Jul-2014 14:18:01] ERROR: FPM initialization failed
[14-Jul-2014 14:18:01] ERROR: FPM initialization failed