Segfault in bundled perl module Storable

Is a NULL pointer dereference somewhere in Perl:

==21857== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==21857== Access not within mapped region at address 0x0
==21857== at 0x9886C06: (within /usr/lib/perl/5.8.8/auto/Storable/Storable.so)
==21857== by 0x9886F1B: mstore (in /usr/lib/perl/5.8.8/auto/Storable/Storable.so)
==21857== by 0x9886FC0: XS_Storable_mstore (in /usr/lib/perl/5.8.8/auto/Storable/Storable.so)
==21857== by 0x4EB7162: Perl_pp_entersub (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4EB59CD: Perl_runops_standard (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4E5F59F: Perl_call_sv (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4EC31DE: Perl_sv_clear (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4EC3A2D: Perl_sv_free (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4EBE838: (within /usr/lib/libperl.so.5.8.8)
==21857== by 0x4EBE890: Perl_sv_clean_objs (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x4E643C4: perl_destruct (in /usr/lib/libperl.so.5.8.8)
==21857== by 0x401892: main (in /usr/bin/perl)

# dpkg -S /usr/lib/perl/5.8.8/auto/Storable/Storable.so
perl: /usr/lib/perl/5.8.8/auto/Storable/Storable.so

# lsb_release -rd
Description: Ubuntu 8.04
Release: 8.04

# apt-cache policy perl
perl:
  Installed: 5.8.8-12
  Candidate: 5.8.8-12
  Version table:
 *** 5.8.8-12 0
        500 http://archive.ubuntu.com hardy/main Packages
        100 /var/lib/dpkg/status

Unfortunately, I cannot distribute the perl script that crashes, but I will try to write a minimal program that reproduces the problem.