PHP FPM 一直挂着
我尝试了各种选择，但每隔几天（主要是每天）FPM 就会停止提供页面，并且我收到 502（来自 cherokee 网络服务器）
日志中填充了以下内容：
[15-Sep-2014 10:17:46] WARNING: [pool www] child 10135 exited on signal 11 (SIGSEGV - core dumped) after 15.512406 seconds from start
[15-Sep-2014 10:17:46] NOTICE: [pool www] child 10138 started
[15-Sep-2014 10:18:02] WARNING: [pool www] child 10138 exited on signal 11 (SIGSEGV - core dumped) after 15.657950 seconds from start
[15-Sep-2014 10:18:02] NOTICE: [pool www] child 10166 started
[15-Sep-2014 10:18:20] WARNING: [pool www] child 10212 exited on signal 11 (SIGSEGV - core dumped) after 10.192596 seconds from start
[15-Sep-2014 10:18:20] NOTICE: [pool www] child 10214 started
[15-Sep-2014 10:19:08] WARNING: [pool www] child 10216 exited on signal 11 (SIGSEGV - core dumped) after 42.754452 seconds from start
[15-Sep-2014 10:19:08] NOTICE: [pool www] child 10242 started
[15-Sep-2014 10:20:22] WARNING: [pool www] child 10332 exited on signal 11 (SIGSEGV - core dumped) after 14.862183 seconds from start
[15-Sep-2014 10:20:22] NOTICE: [pool www] child 10494 started
[15-Sep-2014 10:20:48] WARNING: [pool www] child 10494 exited on signal 11 (SIGSEGV - core dumped) after 26.415409 seconds from start
[15-Sep-2014 10:20:48] NOTICE: [pool www] child 10498 started
[15-Sep-2014 10:32:48] WARNING: [pool www] child 11718 exited on signal 11 (SIGSEGV - core dumped) after 21.319360 seconds from start
[15-Sep-2014 10:32:48] NOTICE: [pool www] child 11720 started
每次发生这种情况时，最后一个日志类似于
[15-Sep-2014 11:01:34] WARNING: [pool www] server reached max_children setting (50), consider raising it
这是同时根据切诺基的连接，它甚至不是尖峰...... 
我尝试过动态的、固定的按需，没有任何变化。不管我设置了什么 max_children 最终都会死。
为什么它不能恢复我不知道，但是现在要切换到其他东西或制作一个每 30 分钟重新启动一次 FPM 的 crontab
服务器
- 机架空间第一代 1024 MB RAM，40 GB 磁盘
- Ubuntu 12.04 LTS
- 切诺基 1.2.103
PHP 5.3.10-1ubuntu3.11 with Suhosin-Patch (cli) (built: Apr 4 2014 01:30:04) 版权所有 (c) 1997-2012 PHP Group Zend Engine v2.3.0, 版权所有 (c) 1998-2012禅德科技
站点获得大约 2k 页面浏览量 pm 所以它甚至没有这么大的负载。
内存使用量徘徊在 300 -> 400mb 左右，swap 为空，平均负载 < ~1.5
fpm 配置
[global]
pid = /var/run/php5-fpm.pid
error_log = /var/log/php5-fpm.log
emergency_restart_threshold = 5
emergency_restart_interval = 1s
process.max = 75
include=/etc/php5/fpm/pool.d/*.conf
池配置
[www]
user = www-data
group = www-data
listen = 127.0.0.1:9000
pm = ondemand
pm.max_children = 50
pm.start_servers = 3
pm.min_spare_servers = 2
pm.max_spare_servers = 6
pm.process_idle_timeout = 10s
pm.max_requests = 100
pm.status_path = /status
ping.path = /fpm/ping
chdir = /
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