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

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

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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"

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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"

回复内容：

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"

立即学习“PHP免费学习笔记（深入）”；

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"

是否安装了opcache，先禁用试试。