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Bus Error with mod_perl 2.04

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david at kineticode

Apr 22, 2008, 12:50 PM

Post #1 of 10 (872 views)
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Bus Error with mod_perl 2.04

Howdy,

I can get Apache to crash with a Bus Error with this httpd.conf:

LoadModule perl_module modules/mod_perl.so
ServerName localhost
ServerRoot /usr/local/apache2
PidFile logs/httpd.pid
Listen 80
User daemon
Group daemon
StartServers 2
ErrorLog logs/error_log
CustomLog logs/access_log combined
TypesConfig conf/mime.types
PerlModule mod_perl2
PerlPassEnv PERL5LIB
PerlModule MyConfig

This is MyConfig.pm:

package MyConfig;

require Apache2::ServerUtil;
my $s = Apache2::ServerUtil->server;
$s->add_config([
'NameVirtualHost *:80',
'<VirtualHost *:80>',
' DocumentRoot /usr/local/apache2/htdocs',
'</VirtualHost>',
]);

1;

If I comment out the <VirtualHost> section, it works. So there's
something about <VirtualHost> sections that add_config doesn't seem to
like. I've attached the Crash file created by Mac OS X. I'm using
mod_perl 2.04 as a DSO with Apache 2.2.8 and Perl 5.10. Holler if you
need more details on my configuration.

Thanks,

David

Attachments:

crash.txt (2.68 KB)

gozer at ectoplasm

Apr 23, 2008, 12:54 AM

Post #2 of 10 (843 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

David E. Wheeler wrote:
> Howdy,
>
> I can get Apache to crash with a Bus Error with this httpd.conf:

Worrysome. Can you also do it with Apache/httpd < 2.2.8

> LoadModule perl_module modules/mod_perl.so
> ServerName localhost
> ServerRoot /usr/local/apache2
> PidFile logs/httpd.pid
> Listen 80
> User daemon
> Group daemon
> StartServers 2
> ErrorLog logs/error_log
> CustomLog logs/access_log combined
> TypesConfig conf/mime.types
> PerlModule mod_perl2
> PerlPassEnv PERL5LIB
> PerlModule MyConfig
>
> This is MyConfig.pm:
>
> package MyConfig;
>
> require Apache2::ServerUtil;
> my $s = Apache2::ServerUtil->server;
> $s->add_config([.
> 'NameVirtualHost *:80',
> '<VirtualHost *:80>',
> ' DocumentRoot /usr/local/apache2/htdocs',
> '</VirtualHost>',
> ]);
>
> 1;
>
> If I comment out the <VirtualHost> section, it works. So there's
> something about <VirtualHost> sections that add_config doesn't seem to
> like. I've attached the Crash file created by Mac OS X. I'm using
> mod_perl 2.04 as a DSO with Apache 2.2.8 and Perl 5.10. Holler if you
> need more details on my configuration.

Can you get a debug build and get a good backtrace out of it ?

--
Philippe M. Chiasson GPG: F9BFE0C2480E7680 1AE53631CB32A107 88C3A5A5
http://gozer.ectoplasm.org/ m/gozer\@(apache|cpan|ectoplasm)\.org/

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david at kineticode

Apr 23, 2008, 10:50 AM

Post #3 of 10 (832 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

On Apr 23, 2008, at 00:54, Philippe M. Chiasson wrote:

> David E. Wheeler wrote:
>> Howdy,
>> I can get Apache to crash with a Bus Error with this httpd.conf:
>
> Worrysome. Can you also do it with Apache/httpd < 2.2.8

Dunno. I'll try another version in a bit.

>> If I comment out the <VirtualHost> section, it works. So there's
>> something about <VirtualHost> sections that add_config doesn't seem
>> to like. I've attached the Crash file created by Mac OS X. I'm
>> using mod_perl 2.04 as a DSO with Apache 2.2.8 and Perl 5.10.
>> Holler if you need more details on my configuration.
>
> Can you get a debug build and get a good backtrace out of it ?

I recompiled mod_perl with MP_DEBUG=1. Is that all I need to do? If
so, where would I find the backtrace? The crash file that Mac OS X
creates isn't any different.

Thanks,

David

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david at kineticode

Apr 23, 2008, 11:07 AM

Post #4 of 10 (838 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

On Apr 23, 2008, at 10:50, David E. Wheeler wrote:

>> Can you get a debug build and get a good backtrace out of it ?
>
> I recompiled mod_perl with MP_DEBUG=1. Is that all I need to do? If
> so, where would I find the backtrace? The crash file that Mac OS X
> creates isn't any different.

I found the docs on perl.apache.org site. I got this:

Core was generated by `/usr/local/apache2/bin/httpd'.
Reading symbols for shared libraries . done
Reading symbols for shared libraries ............ done
#0 0x0002f43b in open_multi_logs ()
(gdb) bt
#0 0x0002f43b in open_multi_logs ()
#1 0x0002f7be in init_config_log ()
#2 0x00002b88 in ap_run_open_logs ()
#3 0x0000a701 in main ()

So I'm guessing that's not enough. I'll recompile Apache with debug
symbols and try again.

Best,

David

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david at kineticode

Apr 23, 2008, 11:26 AM

Post #5 of 10 (838 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

On Apr 23, 2008, at 11:07, David E. Wheeler wrote:

> (gdb) bt
> #0 0x0002f43b in open_multi_logs ()
> #1 0x0002f7be in init_config_log ()
> #2 0x00002b88 in ap_run_open_logs ()
> #3 0x0000a701 in main ()

Shit! I recompiled Perl, Apache, and mod_perl with debugging info, and
got exactly the same thing!

(gdb) bt
#0 0x0002efd2 in open_multi_logs ()
#1 0x0002f354 in init_config_log ()
#2 0x00002514 in ap_run_open_logs ()
#3 0x0000a115 in main ()

Annoying. Is there something else I can do? Would you like me to
upload the core file somewhere?

Best,

David

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gozer at ectoplasm

Apr 24, 2008, 12:03 AM

Post #6 of 10 (815 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

David E. Wheeler wrote:
> On Apr 23, 2008, at 11:07, David E. Wheeler wrote:
>
>> (gdb) bt
>> #0 0x0002f43b in open_multi_logs ()
>> #1 0x0002f7be in init_config_log ()
>> #2 0x00002b88 in ap_run_open_logs ()
>> #3 0x0000a701 in main ()
>
> Shit! I recompiled Perl, Apache, and mod_perl with debugging info, and
> got exactly the same thing!
>
> (gdb) bt
> #0 0x0002efd2 in open_multi_logs ()
> #1 0x0002f354 in init_config_log ()
> #2 0x00002514 in ap_run_open_logs ()
> #3 0x0000a115 in main ()
>
> Annoying. Is there something else I can do? Would you like me to
> upload the core file somewhere?

Nah, the core file by itself is not exactly super usefull. You just have
to figure out how to get a debugging build. Also, I've tried to reproduce
this on OS X/Apache 2.2.8 prefork/ Perl 5.10 without any luck.

Can you post the exact details on how you built each of these ?

For me, it goes something like:

perl> ./Configure -des \
-Doptimize=-g \
-Dprefix=$HOME/opt/perl.org/perl/5.10.0/debug
apache> CFLAGS="-g" ./configure \
--with-included-apr \
--with-mpm=prefork \
--enable-maintainer-mode \
--enable-modules=all \
--neable-mods-shared=max \
--prefix=$HOME/opt/apache.org/httpd/2.2.8/prefork-debug
mod_perl> perl Makefile.PL \
MP_APXS=$HOME/opt/apache.org/httpd/2.2.8/prefork-debug/bin/apxs
MP_MAINTAINER=1 \
MP_DEBUG=1

--
Philippe M. Chiasson GPG: F9BFE0C2480E7680 1AE53631CB32A107 88C3A5A5
http://gozer.ectoplasm.org/ m/gozer\@(apache|cpan|ectoplasm)\.org/

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david at kineticode

May 28, 2008, 9:54 PM

Post #7 of 10 (471 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

On Apr 24, 2008, at 00:03, Philippe M. Chiasson wrote:

> Nah, the core file by itself is not exactly super usefull. You just
> have
> to figure out how to get a debugging build. Also, I've tried to
> reproduce
> this on OS X/Apache 2.2.8 prefork/ Perl 5.10 without any luck.
>
> Can you post the exact details on how you built each of these ?
>
> For me, it goes something like:
>
> perl> ./Configure -des \
> -Doptimize=-g \
> -Dprefix=$HOME/opt/perl.org/perl/5.10.0/debug

For me:

perl-5.10.0> sh Configure -des \
-Duseshrplib\
-Dprefix=/usr/local/perl-5.10.0.d \
-Doptimize='-g'

> apache> CFLAGS="-g" ./configure \
> --with-included-apr \
> --with-mpm=prefork \
> --enable-maintainer-mode \
> --enable-modules=all \
> --neable-mods-shared=max \
> --prefix=$HOME/opt/apache.org/httpd/2.2.8/prefork-debug

For me:

httpd-2.2.8>export CPPFLAGS="-I/usr/local/include"
export LDFLAGS="-L/usr/local/lib"
export CFLAGS="-DAP_UNSAFE_ERROR_LOG_UNESCAPED -g"
./configure \
--prefix=/usr/local/apache2 \
--with-mpm=prefork \
--enable-dav \
--enable-dav-fs \
--enable-log-config \
--enable-authn-file \
--enable-authz-host \
--enable-authz-group \
--enable-authz-user \
--prefix=/usr/local/apache2.d \
--enable-mods-shared="rewrite info worker proxy deflate mod_auth
include ssl env mime-magic auth_digest expires dav dav_fs perl"

So I added the -g to CFLAGS. I didn't have that before. Instead I used
--enable-maintainer-mode as documented in

http://perl.apache.org/docs/2.0/devel/debug/c.html#Analyzing_Dumped_Core_Files

Is that out of date, perhaps?

> mod_perl> perl Makefile.PL \
> MP_APXS=$HOME/opt/apache.org/httpd/2.2.8/prefork-debug/bin/apxs
> MP_MAINTAINER=1 \
> MP_DEBUG=1

For me:

mod_perl-2.0.4>/usr/local/perl-5.10.0.d/bin/perl Makefile.PL \
MP_AP_PREFIX=/usr/local/apache2.d \
MP_MAINTAINER=1 \
MP_PROMPT_DEFAULT=1 \

The above URL doesn't have the MP_MAINTAINER=1 bit, but I followed
your lead. Should it have that?

Ah, bloody hell! Now I get this:

# make
cd "src/modules/perl" && make
cc -I/usr/local/src/mod_perl-2.0.4/src/modules/perl -I/usr/local/src/
mod_perl-2.0.4/xs -I/usr/include/apr-1 -I/usr/include/apr-1 -I/usr/
local/apache2.d/include -fno-common -DPERL_DARWIN -no-cpp-precomp -
DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include -I/usr/
local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE -DMOD_PERL -Wall -
Wmissing-prototypes -Wstrict-prototypes -Wmissing-declarations -Werror
-Wdeclaration-after-statement -DMP_COMPAT_1X -DMP_DEBUG -DMP_TRACE -
DDARWIN -DSIGPROCMASK_SETS_THREAD_MASK -no-cpp-precomp -g \
-c mod_perl.c && mv mod_perl.o mod_perl.lo
In file included from /usr/local/perl-5.10.0.d/lib/5.10.0/
darwin-2level/CORE/perl.h:2382,
from modperl_perl_includes.h:65,
from modperl_common_includes.h:24,
from mod_perl.h:21,
from mod_perl.c:17:
/usr/local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE/handy.h:85:1:
error: "bool" redefined
In file included from /usr/include/mach-o/dyld.h:29,
from /usr/include/apr-1/apr_portable.h:166,
from /usr/local/apache2.d/include/http_protocol.h:31,
from modperl_apache_includes.h:30,
from mod_perl.h:20,
from mod_perl.c:17:
/usr/lib/gcc/i686-apple-darwin9/4.0.1/include/stdbool.h:36:1: error:
this is the location of the previous definition
cc1: warnings being treated as errors
In file included from modperl_perl_includes.h:65,
from modperl_common_includes.h:24,
from mod_perl.h:21,
from mod_perl.c:17:
/usr/local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE/perl.h:3969:
warning: function declaration isn�t a prototype
In file included from modperl_io_apache.h:22,
from modperl_io.h:20,
from mod_perl.h:83,
from mod_perl.c:17:
/usr/local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE/perliol.h:173:
warning: function declaration isn�t a prototype
mod_perl.c: In function �modperl_response_handler�:
mod_perl.c:1019: warning: unused variable �rcfg�
make[1]: *** [mod_perl.lo] Error 1
make: *** [modperl_lib] Error 2

WTF? I could have sworn I built a debugging mod_perl before. Could it
be choking on Perl 5.10 here, too?

Thanks,

David
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pgollucci at p6m7g8

May 29, 2008, 12:41 PM

Post #8 of 10 (460 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

David E. Wheeler wrote:

| perl-5.10.0> sh Configure -des \
| -Duseshrplib\
| -Dprefix=/usr/local/perl-5.10.0.d \
| -Doptimize='-g'
- -g3 -O0 -DDEBUGGING will get you just about everything...

| httpd-2.2.8>export CPPFLAGS="-I/usr/local/include"
| export LDFLAGS="-L/usr/local/lib"
| export CFLAGS="-DAP_UNSAFE_ERROR_LOG_UNESCAPED -g"
in bash, you don't need to use the exports like that....

| So I added the -g to CFLAGS. I didn't have that before. Instead I used
| --enable-maintainer-mode as documented in
|http://perl.apache.org/docs/2.0/devel/debug/c.html#Analyzing_Dumped_Core_Files
This merely adds -DAP_DEBUG which does not include -g, so yes, thats out of date.

CFLAGS="-g3 -O0 -DAP_UNSAFE_ERROR_LOG_UNESCAPED" ..... ./configure
should get you just about everything.

| Ah, bloody hell! Now I get this:
|
| # make
| -Werror
If you just want to see it compile, edit lib/Apache2/Build.pm and remove
- -Werror stuff.

in todo/bugs_build I see that I wrote
==gcc 4.x and higher compiles break under -Werror
==[pgollucci volunteers]

that might be fixed because I did build it recently on FreeBSD with 4.2.x.....

- -Wdeclaration-after-statement -DMP_COMPAT_1X -DMP_DEBUG
| In file included from
| /usr/local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE/perl.h:2382,
| from modperl_perl_includes.h:65,
| from modperl_common_includes.h:24,
| from mod_perl.h:21,
| from mod_perl.c:17:
| /usr/local/perl-5.10.0.d/lib/5.10.0/darwin-2level/CORE/handy.h:85:1:
| error: "bool" redefined
Definitely a perl 5.10 bug in Darwin. Take it to p5p :)
You are not the first to post this.

| WTF? I could have sworn I built a debugging mod_perl before. Could it be
| choking on Perl 5.10 here, too?

- --
- ------------------------------------------------------------------------
Philip M. Gollucci (philip[at]ridecharge.com)
o:703.549.2050x206
Senior System Admin - Riderway, Inc.
http://riderway.com / http://ridecharge.com
1024D/DB9B8C1C B90B FBC3 A3A1 C71A 8E70 3F8C 75B8 8FFB DB9B 8C1C

Work like you don't need the money,
love like you'll never get hurt,
and dance like nobody's watching.

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pgollucci at p6m7g8

May 31, 2008, 2:27 PM

Post #9 of 10 (435 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

Philip M. Gollucci wrote:
> David E. Wheeler wrote:
> This merely adds -DAP_DEBUG which does not include -g, so yes, thats out
> of date.
>
> CFLAGS="-g3 -O0 -DAP_UNSAFE_ERROR_LOG_UNESCAPED" ..... ./configure
> should get you just about everything.
Updated in 662085.

Thanks!

------------------------------------------------------------------------
Philip M. Gollucci (philip[at]ridecharge.com)
o:703.549.2050x206
Senior System Admin - Riderway, Inc.
http://riderway.com / http://ridecharge.com
1024D/DB9B8C1C B90B FBC3 A3A1 C71A 8E70 3F8C 75B8 8FFB DB9B 8C1C

Work like you don't need the money,
love like you'll never get hurt,
and dance like nobody's watching.

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david at kineticode

May 31, 2008, 2:29 PM

Post #10 of 10 (434 views)
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Re: Bus Error with mod_perl 2.04 [In reply to]

On May 31, 2008, at 14:27, Philip M. Gollucci wrote:

>> David E. Wheeler wrote:
>> This merely adds -DAP_DEBUG which does not include -g, so yes,
>> thats out of date.
>> CFLAGS="-g3 -O0 -DAP_UNSAFE_ERROR_LOG_UNESCAPED" ..... ./configure
>> should get you just about everything.
> Updated in 662085.

Cool, thanks!

David

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