I don't know much about debugging, but I had to turn off this "feature" in order to get my Guile module working. To do that I added this code to my Makefile.PL:

# avoid PERL_DL_NONLAZY.  libguile is missing symbols and it's not my
# job to fix...
package MY;
sub test {
    my $self = shift;
    my $result = $self->SUPER::test(@_);
    $result =~ s/PERL_DL_NONLAZY=1//g;
    return $result;
}
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As a sidenote - I cover this problem and the solution in my upcoming book. If you liked my answer, buy a copy and support the artist!

-sam