Myujth

I'm trying to install mod_perl 2.0.10 for use with a new Apache 2.4 instance. I've got Apache 2.4.26 up and running by itself, but I also need mod_perl installed for a couple of modules to work.

Here's the problem: mod_perl always fails its tests claiming:

Syntax error on line 82 of .../t/conf/httpd.conf: Cannot load .../src/modules/perl/mod_perl.so into server: .../src/modules/perl/mod_perl.so: undefined symbol: mg_free_type

The only information I could find on this is here: Error when installing mod_perl2. Unfortunately, it didn't solve the problem.

Using CentOS release 6.8 (Final)
x86_64 x86_64 x86_64 GNU/Linux

More from the log:

> make test
cd "src/modules/perl" && make
make[1]: Entering directory `/software/apa/mod_perl/mod_perl-2.0.10/src/modules/perl'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/software/apa/mod_perl/mod_perl-2.0.10/src/modules/perl'
...
make[1]: Leaving directory `/software/apa/mod_perl/mod_perl-2.0.10/xs'
/usr/bin/perl -Iblib/arch -Iblib/lib 
 t/TEST -clean
[warning] setting ulimit to allow core files
ulimit -c unlimited; /usr/bin/perl /software/apa/mod_perl/mod_perl-2.0.10/t/TEST -clean
APACHE_TEST_APXS= APACHE_TEST_GROUP= APACHE_TEST_HTTPD= APACHE_TEST_PORT= APACHE_TEST_USER= 
 /usr/bin/perl -Iblib/arch -Iblib/lib 
 t/TEST -bugreport -verbose=0 
[warning] setting ulimit to allow core files
ulimit -c unlimited; /usr/bin/perl /software/apa/mod_perl/mod_perl-2.0.10/t/TEST -bugreport -verbose=0
/software/apa/apa24/bin/httpd.prefork -d /software/apa/mod_perl/mod_perl-2.0.10/t -f /software/apa/mod_perl/mod_perl-2.0.10/t/conf/httpd.conf -D APACHE2 -D APACHE2_4 -D PERL_USEITHREADS
using Apache/2.4.26 (prefork MPM)

waiting 300 seconds for server to start: .httpd.prefork: Syntax error on line 82 of /software/apa/mod_perl/mod_perl-2.0.10/t/conf/httpd.conf: Cannot load /software/apa/mod_perl/mod_perl-2.0.10/src/modules/perl/mod_perl.so into server: /software/apa/mod_perl/mod_perl-2.0.10/src/modules/perl/mod_perl.so: undefined symbol: mg_free_type
[ error] 
server has died with status 255 (t/logs/error_log wasn't created, start the server in the debug mode)
sh: line 1: 3359 Terminated /usr/bin/perl /software/apa/mod_perl/mod_perl-2.0.10/t/TEST -bugreport -verbose=0
make: *** [run_tests] Error 143

This problem was fixed in a mod_Perl patch on 4 January 2018:
https://github.com/apache/mod_perl/commit/f4d886fdf7d79d54a0647336b5623b840a053eab

Compile with this git source version to fix the problem, or upgrade Perl to v5.13.6+

This change in Perl as been introduced in source of Perl v5.13.6+.

I solved this by upgrading to Perl 5.14.0 or newer.

In the Perl documentation, mg_free_type first appears in version 5.14.0. You can see under "Magical Functions" where it isn't listed in 5.12.4 but is in 5.14.0

I'm not sure if this is the correct solution as mod_perl2.0 lists Perl 5.6.1 as the minimum version: https://perl.apache.org/docs/2.0/user/install/install.html#item_Perl