Add the "-f" flag to strace and see what errors you get.
Regards, Jie * William N. Braswell, Jr. <william.brasw...@autoparallel.com> wrote: > Date: Mon, 14 Nov 2016 23:27:53 -0600 > From: "William N. Braswell, Jr." <william.brasw...@autoparallel.com> > To: modperl@perl.apache.org > 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: > 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/%3c4a19f19a1bb4d51183220020ed06971401288...@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
