RegistryLoader Segmentation fault

[Fran Fabrizio <ff...@mmrd.com>]

Hello,

I'm trying to follow the script in section 2.14 of the book "mod_perl 
Developer's Cookbook" in order to pre-load my Apache::registry scripts 
using Apache::RegistryLoader.  I'm getting a seg fault when I attempt to 
start apache.

My startup.pl is as follows:

#!/usr/local/bin/perl

use lib qw(/usr/local/apache/lib/perl);
use Apache::DBI;
use Apache::Registry;
use Apache::RegistryLoader;
use DBI;
use DBD::Pg;
use strict;
use CGI qw(-compile :all);
use DirHandle;

my $rl = Apache::RegistryLoader->new;
my $dh = DirHandle->new("/usr/local/apache/cgi-bin/chimpkit/") or die $!;
foreach my $file ($dh->read) {
     next unless $file =~ m/\.pl$/;
     print STDOUT "Pre-loading $file\n";
$rl->handler("/cgi-bin/chimpkit/$file","/usr/local/apache/cgi-bin/chimpkit/$file");
}

1;

When I attempt to start apache, I get the following messages on STDOUT:

[root@castle bin]# ./apachectl start
Pre-loading chimpworks.pl
Apache::Debug: [level 1]
Compiled package "Apache::ROOT::cgi_2dbin::chimpkit::chimpworks_2epl" 
for process 27233 at 
/usr/lib/perl5/site_perl/5.6.0/i386-linux/Apache/RegistryLoader.pm line 76.
./apachectl: line 171: 27233 Segmentation fault      (core dumped) $HTTPD
./apachectl start: httpd could not be started
[root@castle bin]#

Nothing has been written to the error log.  The format of my 
$rl->handler() call seems ok to me.  I perused the archives for a while 
and tried a couple of things that fixed other people's RegistryLoader 
problems, to no avail.  Everything works fine if I comment out the call 
to handler() except of course now each child has a copy of the compiled 
code.  Any thoughts?

Thanks,
Fran

Re: RegistryLoader Segmentation fault

[Fran Fabrizio <ff...@mmrd.com>]

> see Recipe 9.19 for a general introduction into using gbd and getting
> a backtrace, as well as the SUPPORT document in the mod_perl sources


Here is the backtrace for now.  I'm going to try Perl 5.6.1 and then try 
to see what the backtrace looks like with a PERL_DEBUG=1 enabled 
mod_perl.  Thanks for the help thus far.

-Fran

(gdb) bt
#0  0x80ca6b6 in Perl_gv_init ()
#1  0x80cb9d5 in Perl_gv_fetchpv ()
#2  0x80810dd in perl_section_hash_init ()
#3  0x8081403 in perl_section ()
#4  0x809aa40 in ap_clear_module_list ()
#5  0x809b598 in ap_handle_command ()
#6  0x809b635 in ap_srm_command_loop ()
#7  0x809ef2a in ap_limit_section ()
#8  0x809aa40 in ap_clear_module_list ()
#9  0x809b598 in ap_handle_command ()
#10 0x809b635 in ap_srm_command_loop ()
#11 0x809bd52 in ap_process_resource_config ()
#12 0x80a0cc7 in ap_exists_config_define ()
#13 0x809aadc in ap_clear_module_list ()
#14 0x809b598 in ap_handle_command ()
#15 0x809b635 in ap_srm_command_loop ()
#16 0x809bd52 in ap_process_resource_config ()
#17 0x809c695 in ap_read_config ()
#18 0x80a6e9f in main ()
#19 0x400a1b65 in __libc_start_main (main=0x80a6bb8 <main>, argc=1,
     ubp_av=0xbffffaf4, init=0x80621d4 <_init>, fini=0x814a26c <_fini>,
     rtld_fini=0x4000df24 <_dl_fini>, stack_end=0xbffffaec)
     at ../sysdeps/generic/libc-start.c:111

Re: RegistryLoader Segmentation fault

[Geoffrey Young <ge...@modperlcookbook.org>]

whoops, forgot to CC the list, but it seems Ged stepped in with the
same info...

Fran Fabrizio wrote:
> 
> Hello,
> 
> I'm trying to follow the script in section 2.14 of the book "mod_perl
> Developer's Cookbook" in order to pre-load my Apache::registry scripts
> using Apache::RegistryLoader.  I'm getting a seg fault when I attempt to
> start apache.
> 

I've never seen a segfault with RegistryLoader, but there are a few
avenues that might help.

see Recipe 9.19 for a general introduction into using gbd and getting
a backtrace, as well as the SUPPORT document in the mod_perl sources

maybe someone else has seen this before and can offer more help

--Geoff

Re: RegistryLoader Segmentation fault

[Fran Fabrizio <ff...@mmrd.com>]

Fran Fabrizio wrote:

> 
> Hello,
> 
> I'm trying to follow the script in section 2.14 of the book "mod_perl 
> Developer's Cookbook" in order to pre-load my Apache::registry scripts 
> using Apache::RegistryLoader.  I'm getting a seg fault when I attempt to 
> start apache.


This was the problem I was having last Friday.  Just wanted to post the 
results - the upgrade to Perl 5.6.1 solved the problem.  PERL_DEBUG=1 on 
mod_perl compilation was also very helpful.  Thanks to everyone for 
their help!

-Fran

Re: RegistryLoader Segmentation fault

[Fran Fabrizio <ff...@mmrd.com>]

Ged,


>>using Apache::RegistryLoader.  I'm getting a seg fault when I attempt to 
>>start apache.
>>
> 
> Read mod_perl/SUPPORT.


Ok I've looked through it.  I've tried some of the quicker 
suggestions... gdb -core core and gdb httpd core tell me:

Core was generated by `/usr/local/apache/bin/httpd'.
Program terminated with signal 11, Segmentation fault.

#0  0x80ca6b6 in Perl_gv_init ()


I'll try some of the more involved stuff here in a moment


> Did you compile your own Perl, mod_perl and Apache?


Yes.  Perl 5.6.0, mod_perl 1.25, apache 1.3.19.

 
> You might be better off with Perl version 5.6.1 instead.


I will upgrade and see what happens.


> Are you using DSO?


No.

Thanks for the pointers thus far!

-Fran

Re: RegistryLoader Segmentation fault

[Ged Haywood <ge...@www2.jubileegroup.co.uk>]

Hi there,

On Fri, 1 Mar 2002, Fran Fabrizio wrote:

> using Apache::RegistryLoader.  I'm getting a seg fault when I attempt to 
> start apache.

Read mod_perl/SUPPORT.

Did you compile your own Perl, mod_perl and Apache?

You might be better off with Perl version 5.6.1 instead.

Are you using DSO?

73,
Ged.