Segfault in XML::LibXML

Hi all;
   I've just started getting one of those lovely errors
we all enjoy so much. You know the ones: they sometimes
give segfaults, but not every time, and only happens
on long jobs...

So, I ran valgrind (with PERL_DESTRUCT_LEVEL=2),
which then takes _even_ longer, and end up with
some kind of reference counting error, I presume?
(see below).
This is on fedora 10,
perl-5.10.0-56
libxml2-2.6.3.1
perl-XML-LibXML-1.66-2

Undoubtedly, this isn't enough to proceed with,
but as this is relatively unfamiliar territory
for me: Does anyone have suggestions how to
localize the problem better?

> ==4053== Invalid read of size 8
> ==4053==    at 0xAF9F838: PmmREFCNT_dec (in /usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi/auto/XML/LibXML/LibXML.so)
> ==4053==    by 0xAF32D1A: XS_XML__LibXML__Node_DESTROY (in /usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi/auto/XML/LibXML/LibXML.so)
> ==4053==    by 0x38EA4BF6B4: Perl_pp_entersub (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4BA90B: Perl_call_sv (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4D63DC: Perl_sv_clear (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4D6D40: Perl_sv_free2 (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4D66F0: Perl_sv_clear (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4D6D40: Perl_sv_free2 (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4ADAF0: Perl_hv_free_ent (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4AF020: (within /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4B1020: Perl_hv_undef (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4D6805: Perl_sv_clear (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==  Address 0x2711ff30 is 0 bytes inside a block of size 34 free'd
> ==4053==    at 0x4A0609F: free (vg_replace_malloc.c:323)
> ==4053==    by 0x38EA4B05C1: Perl_hv_common (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4C3B09: Perl_pp_helem (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA494AC6: Perl_runops_debug (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x38EA4BB5D6: perl_run (in /usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE/libperl.so)
> ==4053==    by 0x400CF3: main (in /usr/bin/perl)
> 
> ==4053== 
> ==4053== ERROR SUMMARY: 2 errors from 1 contexts (suppressed: 4 from 1)
> ==4053== malloc/free: in use at exit: 56,246 bytes in 521 blocks.
> ==4053== malloc/free: 323,176,837 allocs, 323,176,316 frees, 21,619,182,773 bytes allocated.
> ==4053== For counts of detected errors, rerun with: -v
> ==4053== searching for pointers to 521 not-freed blocks.
> ==4053== checked 803,936 bytes.
> ==4053== 
> ==4053== LEAK SUMMARY:
> ==4053==    definitely lost: 0 bytes in 0 blocks.
> ==4053==      possibly lost: 0 bytes in 0 blocks.
> ==4053==    still reachable: 56,246 bytes in 521 blocks.
> ==4053==         suppressed: 0 bytes in 0 blocks.
> ==4053== Rerun with --leak-check=full to see details of leaked memory.



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