strange crashes

Since some time I get some strange crashes while running the tests on Math::GSL. I say strange because Jonathan doesn't have them with this configuration : swig 1.3.35/perl 5.10/gcc 3.4.6. My configuration is swig 1.3.35/perl 5.10/gcc 4.2.3. Here is the bactrace :

t/Poly........Name "swig_runtime_data::type_pointer3" used only once: possible typo at /usr/local/lib/perl5/5.10.0/i686-linux/DynaLoader.pm line 226.
*** glibc detected *** /usr/local/bin/perl: free(): invalid next size (fast): 0x083e9c18 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7e11a85]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb7e154f0]
/home/thierry/gsoc/dev/Math-GSL/blib/arch/Poly.so(_wrap_gsl_poly_complex_eval+0x450)[0xb7a33581]
/usr/local/bin/perl(Perl_pp_entersub+0x2d7)[0x80a5347]
/usr/local/bin/perl(Perl_runops_standard+0xe)[0x80a3e0e]
/usr/local/bin/perl(perl_run+0x290)[0x80a0420]
/usr/local/bin/perl(main+0xc5)[0x80623a5]
/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0)[0xb7dbc450]
/usr/local/bin/perl[0x8062271]
======= Memory map: ========
08048000-0814e000 r-xp 00000000 08:05 352692     /usr/local/bin/perl
0814e000-08151000 rw-p 00105000 08:05 352692     /usr/local/bin/perl
08151000-08425000 rw-p 08151000 00:00 0          [heap]
b7900000-b7921000 rw-p b7900000 00:00 0
b7921000-b7a00000 ---p b7921000 00:00 0
b7a00000-b7a0a000 r-xp 00000000 08:05 49216      /lib/libgcc_s.so.1
b7a0a000-b7a0b000 rw-p 0000a000 08:05 49216      /lib/libgcc_s.so.1
b7a18000-b7a2e000 r-xp 00000000 08:05 566124     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Complex.so
b7a2e000-b7a2f000 rw-p 00016000 08:05 566124     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Complex.so
b7a2f000-b7a3c000 r-xp 00000000 08:05 566134     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Poly.so
b7a3c000-b7a3d000 rw-p 0000c000 08:05 566134     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Poly.so
b7a3d000-b7a42000 r-xp 00000000 08:05 550088     /usr/local/lib/perl5/5.10.0/i686-linux/auto/List/Util/Util.so
b7a42000-b7a43000 rw-p 00004000 08:05 550088     /usr/local/lib/perl5/5.10.0/i686-linux/auto/List/Util/Util.so
b7a43000-b7a5a000 r-xp 00000000 08:05 566320     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Const.so
b7a5a000-b7a5b000 rw-p 00017000 08:05 566320     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Const.so
b7a5b000-b7a8b000 r-xp 00000000 08:05 352735     /usr/local/lib/libgslcblas.so.0.0.0
b7a8b000-b7a8c000 rw-p 0002f000 08:05 352735     /usr/local/lib/libgslcblas.so.0.0.0
b7a8c000-b7c28000 r-xp 00000000 08:05 352739     /usr/local/lib/libgsl.so.0.12.0
b7c28000-b7c32000 rw-p 0019b000 08:05 352739     /usr/local/lib/libgsl.so.0.12.0
b7c37000-b7c3e000 r-xp 00000000 08:05 550369     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Data/Dumper/Dumper.so
b7c3e000-b7c3f000 rw-p 00006000 08:05 550369     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Data/Dumper/Dumper.so
b7c3f000-b7c44000 r-xp 00000000 08:05 566132     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Machine.so
b7c44000-b7c45000 rw-p 00004000 08:05 566132     /home/thierry/gsoc/dev/Math-GSL/blib/arch/Machine.so
b7c45000-b7c67000 r--p 00000000 08:05 445488     /usr/share/locale-langpack/fr/LC_MESSAGES/libc.mo
b7c67000-b7c78000 r-xp 00000000 08:05 550386     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Storable/Storable.so
b7c78000-b7c79000 rw-p 00010000 08:05 550386     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Storable/Storable.so
b7c79000-b7c7b000 r-xp 00000000 08:05 550098     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Fcntl/Fcntl.so
b7c7b000-b7c7c000 rw-p 00002000 08:05 550098     /usr/local/lib/perl5/5.10.0/i686-linux/auto/Fcntl/Fcntl.so
b7c7c000-b7c80000 r-xp 00000000 08:05 550330     /usr/local/lib/perl5/5.10.0/i686-linux/auto/IO/IO.so
b7c80000-b7c81000 rw-p 00003000 08:05 550330     /usr/local/lib/perl5/5.10.0/i686-linux/auto/IO/IO.so
b7c81000-b7cc0000 r--p 00000000 08:05 296967     /usr/lib/locale/fr_CA.utf8/LC_CTYPE
b7cc0000-b7cc1000 r--p 00000000 08:05 297259     /usr/lib/locale/fr_CA.utf8/LC_NUMERIC
b7cc1000-b7cc2000 r--p 00000000 08:05 297237     /usr/lib/locale/fr_CA.utf8/LC_TIME
b7cc2000-b7da3000 r--p 00000000 08:05 296823     /usr/lib/locale/fr_CA.utf8/LC_COLLATE
b7da3000-b7da4000 r--p 00000000 08:05 297231     /usr/lib/locale/fr_CA.utf8/LC_MONETARY
b7da4000-b7da5000 r--p 00000000 08:05 311322     /usr/lib/locale/fr_CA.utf8/LC_MESSAGES/SYS_LC_MESSAGES
b7da5000-b7da6000 rw-p b7da5000 00:00 0
b7da6000-b7eef000 r-xp 00000000 08:05 66873      /lib/tls/i686/cmov/libc-2.7.so
b7eef000-b7ef0000 r--p 00149000 08:05 66873      /lib/tls/i686/cmov/libc-2.7.so
t/Poly........dubious                                                       
    Test returned status 0 (wstat 6, 0x6)