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From "Fabio F.Gervasi" <fabio.gervas...@gmail.com>
Subject [users@httpd] Random Internal Server Error 500 after apache and system update
Date Fri, 30 Sep 2016 06:59:02 GMT
Hi,

I'm not 100% sure that the real source of the problem is apache (could be
php or other), but I'd like start from here as the only logs that provides
me with information (with trace4 level) is apache log. No information
appears from other logs.

I have:
- Linux 4.7.4-100.fc23.x86_64
- Server version: Apache/2.4.23 (Fedora)
- mysql  Ver 15.1 Distrib 10.0.26-MariaDB, for Linux (x86_64) using
readline 5.1
- PHP Version => 5.6.25

The problem: random internal server error 500. Random because, for example,
if a page produces the error and do "reload" then it works. The same page
may not work as well as work. Sometimes you can use the site for several
minutes with no problems, then suddenly there is the error.

When error occurs, this is all that I get from the log file (with 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
[...]

Note the use of fcgi. Apache is indeed configured with
event/php-fpm/FastCGI, but the same thing happens with "normal" prefork /
php!
Until a few days ago it did not happen, it started after updating the
system (kernel, apache, php, mariadb).
I do not really know what to do.

Thank you very much.
Fabio.

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