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我的日志中不断收到以下错误php-fpm。我已阅读并尝试了 serverfault.com 上的一些类似问题，但问题仍未解决。
[11-Apr-2017 08:33:27] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 09:49:26] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 09:49:26] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 09:56:11] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 09:56:11] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:09:56] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:09:56] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:22:39] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:22:39] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:35:52] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:35:52] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:38:52] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:46:33] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:46:33] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:54:21] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:54:21] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 10:59:17] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:03:16] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:03:16] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:05:50] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:05:50] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:05:50] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:05:50] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:12:03] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:32:45] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:32:45] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:48:28] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:48:28] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:53:11] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:55:15] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 11:55:15] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 12:06:17] ERROR: unable to read what child say: Bad file descriptor (9)
[11-Apr-2017 12:06:17] ERROR: unable to read what child say: Bad file descriptor (9)
我的操作系统是 CentOS7，我正在PHP7-FPM使用nginx
服务器规格如下
处理器：Intel Xeon E5-1620v2
服务器内存：64GB DDR3
我当前的 fpm 配置如下
pid = /run/plesk-php70-fpm.pid
error_log = /var/log/plesk-php70-fpm/error.log
log_level = error
emergency_restart_threshold = 10
emergency_restart_interval = 1m
process_control_timeout = 10s
listen.backlog = 65535
;[php-fpm-pool-settings]
pm = ondemand
pm.max_children = 2000
pm.process_idle_timeout = 10s
#pm.max_requests = 10000
#pm = dynamic
#pm.max_children = 5000
#pm.start_servers = 50
#pm.min_spare_servers = 20
#pm.max_spare_servers = 70
#pm.max_requests = 10000
我已经尝试过pm ondemand了pm dynamic