502 - php的phalcon框架502 Bad Gateway错误，nginx环境

Question

如果是简单的 echo 'hello world'; 的话可以正常访问，使用phalcon的就不行，不知道怎么回事，求助。
php-fpm.log总是出现下面这样的提示：

[16-May-2015 19:08:58] NOTICE: [pool www] child 28875 started
[16-May-2015 19:09:00] WARNING: [pool www] child 28870 exited on signal 11 (SIGSEGV - core dumped) after 3.975894 seconds from start
[16-May-2015 19:09:00] NOTICE: [pool www] child 28878 started
[16-May-2015 19:09:02] WARNING: [pool www] child 28875 exited on signal 11 (SIGSEGV - core dumped) after 4.456202 seconds from start
[16-May-2015 19:09:02] NOTICE: [pool www] child 28880 started
[16-May-2015 19:10:20] WARNING: [pool www] child 28878 exited on signal 11 (SIGSEGV - core dumped) after 80.234199 seconds from start
[16-May-2015 19:10:20] NOTICE: [pool www] child 28896 started
[16-May-2015 19:10:27] WARNING: [pool www] child 28880 exited on signal 11 (SIGSEGV - core dumped) after 84.586972 seconds from start
[16-May-2015 19:10:27] NOTICE: [pool www] child 28902 started
[16-May-2015 19:33:08] WARNING: [pool www] child 28902 exited on signal 11 (SIGSEGV - core dumped) after 1361.414055 seconds from start
[16-May-2015 19:33:08] NOTICE: [pool www] child 29351 started

nginx错误

015/05/16 19:10:27 [error] 27803#0: *214 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.153.1, server: www.codebaa.com, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php-fastcgi.socket:", host: "www.codebaa.com", referrer: "http://www.codebaa.com/ajax/test/test"

2015/05/16 19:33:08 [error] 27803#0: *218 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.153.1, server: www.codebaa.com, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php-fastcgi.socket:", host: "www.codebaa.com", referrer: "http://www.codebaa.com/ajax/test/test"

Answer 1

是否安装了opcache，先禁用试试。

Answer 2

我也遇到这个问题，重启php-fpm可以暂时解决，log中也不出现上面那个警告了。但是要不了一天又502，错误日志中又出现这个警告。。。

找到一个这样的回答：child ... exited on signal 11 means PHP is crashing while servicing requests. Depending on when in the processing it crashed, this may have no visible impact, or may result in blank pages, aborted transfers, users being mysteriously logged out, etc. Consider updating PHP to the latest point release (5.3.x or 5.4.x) and removing or replacing known problematic extensions such as APC.
也就是说，child ... exited on signal 11代表PHP子进程崩溃了，考虑升级PHP并移除或替换已知的有问题的扩展，例如APC