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From "William N. Braswell, Jr." <william.brasw...@autoparallel.com>
Subject Re: mod_perl Silent Failure, Very Mysterious
Date Tue, 15 Nov 2016 06:13:58 GMT
Hi Jie,
I have captured the output of `strace -f /usr/sbin/apache2 -e trace8
-k start`:
http://hastebin.com/unupocozop.pl
Looks like it is dying with a segfault, but I'm not sure what is
causing this???
Thanks so much for your help!!!  :-)
~ Will

[[[ BEGIN PASTE SNIPPET ]]]
[pid  6550] stat("blib/lib/DynaLoader.pmc", 0x7ffdda87f280) = -1
ENOENT (No such file or directory)[pid  6550]
stat("blib/lib/DynaLoader.pm", 0x7ffdda87f1b0) = -1 ENOENT (No such
file or directory)[pid  6550] stat("/etc/perl/DynaLoader.pmc",
0x7ffdda87f280) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/etc/perl/DynaLoader.pm", 0x7ffdda87f1b0) = -1 ENOENT (No such
file or directory)[pid  6550]
stat("/usr/local/lib/x86_64-linux-gnu/perl/5.22.1/DynaLoader.pmc",
0x7ffdda87f280) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/local/lib/x86_64-linux-gnu/perl/5.22.1/DynaLoader.pm",
0x7ffdda87f1b0) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/local/share/perl/5.22.1/DynaLoader.pmc", 0x7ffdda87f280) =
-1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/local/share/perl/5.22.1/DynaLoader.pm", 0x7ffdda87f1b0) =
-1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/lib/x86_64-linux-gnu/perl5/5.22/DynaLoader.pmc",
0x7ffdda87f280) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/lib/x86_64-linux-gnu/perl5/5.22/DynaLoader.pm",
0x7ffdda87f1b0) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/share/perl5/DynaLoader.pmc", 0x7ffdda87f280) = -1 ENOENT
(No such file or directory)[pid  6550]
stat("/usr/share/perl5/DynaLoader.pm", 0x7ffdda87f1b0) = -1 ENOENT (No
such file or directory)[pid  6550]
stat("/usr/lib/x86_64-linux-gnu/perl/5.22/DynaLoader.pmc",
0x7ffdda87f280) = -1 ENOENT (No such file or directory)[pid  6550]
stat("/usr/lib/x86_64-linux-gnu/perl/5.22/DynaLoader.pm",
{st_mode=S_IFREG|0644, st_size=10748, ...}) = 0[pid  6550]
open("/usr/lib/x86_64-linux-gnu/perl/5.22/DynaLoader.pm", O_RDONLY) =
5[pid  6550] ioctl(5, TCGETS, 0x7ffdda87ef50) = -1 ENOTTY
(Inappropriate ioctl for device)[pid  6550] lseek(5, 0, SEEK_CUR)     
 = 0[pid  6550] read(5, "# Generated from DynaLoader_pm.P"..., 8192) =
8192[pid  6550] --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR,
si_addr=0x7f491064fa00} ---[pid  6550] chdir("/etc/apache2")       =
0[pid  6550] rt_sigaction(SIGSEGV, {SIG_DFL, [],
SA_RESTORER|SA_INTERRUPT, 0x7f4918dea3d0}, {SIG_DFL, [],
SA_RESTORER|SA_RESETHAND, 0x7f4918dea3d0}, 8) = 0[pid  6550]
kill(6550, SIGSEGV)         = 0[pid  6550] rt_sigreturn({mask=[]})    
= 139951873083648[pid  6550] --- SIGSEGV {si_signo=SIGSEGV,
si_code=SI_USER, si_pid=6550, si_uid=0} ---[pid  6549] +++ exited with
0 ++++++ killed by SIGSEGV (core dumped) +++
[[[ END PASTE SNIPPET ]]]
On 11/14/2016 at 11:54 PM, "Jie Gao"  wrote:Add the "-f" flag to
strace and see what errors you get.
Regards,

Jie 

* William N. Braswell, Jr.  wrote:

> Date: Mon, 14 Nov 2016 23:27:53 -0600
> From: "William N. Braswell, Jr." 
> 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/%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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