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From "William N. Braswell, Jr." <william.brasw...@autoparallel.com>
Subject mod_perl Silent Failure, Very Mysterious
Date Tue, 15 Nov 2016 05:27:53 GMT
Hello everyone, I'm trying to enable a web app (Catalyst ShinyCMS) to
run under mod_perl, it is definitely supposed to work but it fails
without any errors, and I've been trying for several days to get it
working.
My system info:
* Perl 5, version 22, subversion 1 (v5.22.1) built for
x86_64-linux-gnu-thread-multi
* libapache2-mod-perl2 v2.0.9-4ubuntu1
* Apache/2.4.18 (Ubuntu)
* $Apache::Test::VERSION = 1.39
* $Catalyst::VERSION = 5.90112
* $ShinyCMS::VERSION = 0.007
I know the app already functions properly when running via the
stand-alone test server script (PSGI) or fastcgi, and I am able to run
a trivial Catalyst test application successfully under mod_perl, so
this issue seems to have something to do with the interaction between
the ShinyCMS app and mod_perl.
I have added print debug statements in my app, so when I call my app
from within the Apache site conf file then I can see the debug
statements prove that it is successfully going all the way through my
app, and it even returns control to the embedded  code w/in the Apache
site conf file, but it still just silently fails anyway with the
following non-descriptive error:
"The apache2 instance did not start within 20 seconds. Please read the
log files to discover problems"
Unfortunately the log files do not provide any additional information
whatsoever!
Here are my Apache config files and the output of trying to start
Apache manually, you can see my ">" statements which prove that my
ShinyCMS app code is definitely executing all the way through and
returning control to Apache:
http://hastebin.com/rulixitole.php
http://hastebin.com/wevicagano.rb
This is a really mysterious issue, when I run `apache2ctl -e debug -k
start` as seen in the link above, it goes through the motions as if it
is starting correctly, and it does not give any error messages, but
when apache2ctl is done there simply are not any apache processes
running...
I only found 1 person on google with a possibly-similar issue, but he
told me that he never found a solution:
https://github.com/timbunce/devel-nytprof/issues/89
I also found 1 person on the mod_perl mailing list archives with
another possibly-similar issue, but I have no way to follow up, and
I'm not sure of the best way to totally rebuild everything from
source:
https://mail-archives.apache.org/mod_mbox/perl-modperl/200207.mbox/%3C4A19F19A1BB4D51183220020ED069714012882B0@exch2.iso-ne.com%3E
I have asked for help on IRC #httpd, user Unbeliever suggested I
ascertain my real /usr/sbin/apache2 command line and run it through
strace, then post to this mailing list.
I used -x in apache2ctl which showed me I was simply sourcing
/tmp/apache2/envvars and then running `/usr/sbin/apache2 -e trace8 -k
start` which are the exact same args as accepted by the apache2ctl
script.
I have now run `strace /usr/sbin/apache2 -e trace8 -k start` which
generates 2.5MB of text output, I have pasted the last few pages of it
on hastebin, I can post the whole thing for download if needed:
http://hastebin.com/idemogexiq.erl
I am not sure how to interpret the results of the strace command
output and debug this issue, help please?
Any and all assistance is greatly appreciated!  :-)
Thanks,~ Will
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