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From Jie Gao <>
Subject Re: mod_perl Silent Failure, Very Mysterious
Date Tue, 15 Nov 2016 05:54:51 GMT
Add the "-f" flag to strace and see what errors you get.



* William N. Braswell, Jr. <> wrote:

> Date: Mon, 14 Nov 2016 23:27:53 -0600
> From: "William N. Braswell, Jr." <>
> To:
> Subject: mod_perl Silent Failure, Very Mysterious
> 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:
> 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:
> 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:
> 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:
> 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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