perl-5.14.2nb5/5.1/amd64 segfaults on 6.0_RC1

[Aleksey Cheusov <cheusov%tut.by@localhost>]

perl-5.14.2nb5 compiled for 5.1.2/amd64 segfaults on 6.0_RC1.
Any ideas why?

/usr/pkg/bin/perl -e 'require XML::Parser'
produces the following.

#0  0x00007f7ff79a7ac0 in Perl_av_len ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#1  0x00007f7ff7944eab in Perl_call_list ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#2  0x00007f7ff6610668 in boot_XML__Parser__Expat ()
   from 
/usr/pkg/lib/perl5/vendor_perl/5.14.0/x86_64-netbsd-thread-multi/auto/XML/Parser/Expat/Expat.so
#3  0x00007f7ff79ab1c3 in Perl_pp_entersub ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#4  0x00007f7ff79a97ee in Perl_runops_standard ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#5  0x00007f7ff7944c4b in Perl_call_sv ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#6  0x00007f7ff794507f in Perl_call_list ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#7  0x00007f7ff7930964 in S_process_special_blocks ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#8  0x00007f7ff794039f in Perl_newATTRSUB ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#9  0x00007f7ff796b557 in Perl_yyparse ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#10 0x00007f7ff79e1621 in S_doeval ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#11 0x00007f7ff79e377e in Perl_pp_require ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#12 0x00007f7ff79a97ee in Perl_runops_standard ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#13 0x00007f7ff7945553 in perl_run ()
   from /usr/pkg/lib/perl5/5.14.0/x86_64-netbsd-thread-multi/CORE/libperl.so
#14 0x00000000004011fd in main ()

-- 
Best regards, Aleksey Cheusov.