我不是100％确定问题的真正来源是apache（可能是php或其他），但我想从这里开始，因为唯一提供我信息的日志（具有trace4级别）是apache日志。其他日志中不会显示任何信息。
我有： - Linux 4.7.4-100.fc23.x86_64 - 服务器版本：Apache / 2.4.23（Fedora） - mysql Ver 15.1 Distrib 10.0.26-MariaDB，for Linux（x86_64），使用readline 5.1 - PHP Version =＆gt; 25年6月5日
问题：随机内部服务器错误500.随机，因为，例如，如果页面产生错误并执行“重新加载”，则它可以正常工作。同一页面可能无法正常工作。有时你可以毫不费力地使用网站几分钟，然后突然出现错误。
发生错误时，这就是我从日志文件中获得的所有内容（使用loglevel = trace4）：
[...]
[Fri Sep 30 07:41:39.151052 2016] [rewrite:trace3] [pid 17957:tid 140241771534080] mod_rewrite.c(477): [client 151.25.206.200:38368] 151.25.206.200 - - [www.centrometeo.com/sid#55c3e3673400][rid#7f8c8000e9d0/subreq] [perdir /home/web/centrometeo.com/] applying pattern '.*' to uri 'index.php', referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.151092 2016] [rewrite:trace1] [pid 17957:tid 140241771534080] mod_rewrite.c(477): [client 151.25.206.200:38368] 151.25.206.200 - - [www.centrometeo.com/sid#55c3e3673400][rid#7f8c8000e9d0/subreq] [perdir /home/web/centrometeo.com/] pass through /home/web/centrometeo.com/index.php, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913003 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(567): [client 151.25.206.200:38368] Headers from script 'php.fcgi':, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913097 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] Status: 500 Internal Server Error, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913130 2016] [core:trace1] [pid 17957:tid 140241771534080] util_script.c(649): [client 151.25.206.200:38368] Status line from script 'php.fcgi': 500 Internal Server Error, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913162 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] X-Powered-By: PHP/5.6.26, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913191 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] P3P: CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM", referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913218 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] Content-Encoding: gzip, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913246 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] Vary: Accept-Encoding, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913275 2016] [core:trace4] [pid 17957:tid 140241771534080] util_script.c(568): [client 151.25.206.200:38368] Content-type: text/html; charset=UTF-8, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913395 2016] [http:trace3] [pid 17957:tid 140241771534080] http_filters.c(1006): [client 151.25.206.200:38368] Response sent with status 500, headers:, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913432 2016] [http:trace4] [pid 17957:tid 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] X-Powered-By: PHP/5.6.26, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913458 2016] [http:trace4] [pid 17957:tid 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] P3P: CP=\\"NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM\\", referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[Fri Sep 30 07:41:39.913481 2016] [http:trace4] [pid 17957:tid 140241771534080] http_filters.c(835): [client 151.25.206.200:38368] Content-Encoding: gzip, referer: http://www.centrometeo.com/modelli-numerici/modello-wrf-nmm/559-wrf-mslp-6hprec-ita
[...]
注意使用fcgi。 Apache确实配置了event / php-fpm / FastCGI，但同样的事情发生在“普通”prefork / php！ 直到几天前它没有发生，它在更新系统（内核，apache，php，mariadb）后开始。 我真的不知道该怎么做。
非常感谢。
其他信息：
/ var / log / httpd / error_log，在“崩溃时”： [星期五9月30日19：09：03.897325 2016] [mpm_event：trace4] [pid 30339：tid 139796798162688] event.c（930）：套接字在延迟关闭状态下达到超时