我构建（酿造）了自己的 perl，然后是 mod_perl 模块，然后安装了所有必需的 perl 库。
mod_perl 环境运行良好。使用 Math::PARI 的单行代码也可以使用，例如：
perl -MMath::Pari -e "使用 Math::Pari ':float', 'type_name'; 警告 type_name 22222222222222222222222;" t_INT 在 -e 第 1 行。
但是，当我启动 apache2/mod_perl 并尝试加载 Math::PARI 时，出现以下崩溃：
root@paris:/usr/apps/test/config# gdb -q /usr/sbin/apache2
Reading symbols from /usr/sbin/apache2...(no debugging symbols found)...done.
(gdb) set args -f /usr/apps/test/config/httpd.conf -k start
(gdb) run
Starting program: /usr/sbin/apache2 -f /usr/apps/test/config/httpd.conf -k start
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff367bea7 in moveoffstack_newer_than () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/x86_64-linux-thread-multi/auto/Math/Pari/Pari.so
(gdb) bt
#0 0x00007ffff367bea7 in moveoffstack_newer_than () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/x86_64-linux-thread-multi/auto/Math/Pari/Pari.so
#1 0x00007ffff367c008 in XS_Math__Pari_DESTROY () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/site_perl/5.14.2/x86_64-linux-thread-multi/auto/Math/Pari/Pari.so
#2 0x00007ffff5bca17c in Perl_pp_entersub () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#3 0x00007ffff5b5c771 in Perl_call_sv () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#4 0x00007ffff5bd0629 in Perl_sv_clear () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#5 0x00007ffff5bd0ce2 in Perl_sv_free2 () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#6 0x00007ffff5bcb647 in S_visit () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#7 0x00007ffff5bd1456 in Perl_sv_clean_objs () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#8 0x00007ffff5b5e4a7 in perl_destruct () from /opt/perl5/perlbrew/perls/perl-5.14.2/lib/5.14.2/x86_64-linux-thread-multi/CORE/libperl.so
#9 0x00007ffff7f8d477 in modperl_perl_destruct () from /opt/perl5/perlbrew/perls/perl-5.14.2/usr/lib/apache2/modules/mod_perl.so
#10 0x00007ffff7f7d81e in modperl_interp_destroy () from /opt/perl5/perlbrew/perls/perl-5.14.2/usr/lib/apache2/modules/mod_perl.so
#11 0x00007ffff7f7e3c5 in modperl_tipool_destroy () from /opt/perl5/perlbrew/perls/perl-5.14.2/usr/lib/apache2/modules/mod_perl.so
#12 0x00007ffff7f7d882 in modperl_interp_pool_destroy () from /opt/perl5/perlbrew/perls/perl-5.14.2/usr/lib/apache2/modules/mod_perl.so
#13 0x00007ffff776499e in apr_pool_destroy () from /usr/lib/libapr-1.so.0
#14 0x00007ffff7764b95 in apr_pool_clear () from /usr/lib/libapr-1.so.0
#15 0x0000555555585e67 in main ()
有关环境的更多信息：
- Debian 7.11
- perl-5.14.2（与系统 perl 相同，但使用 perlbrew 构建）
- mod_perl2（手动构建）
我怎样才能找到这个的根本原因？