Yes I don't think the code I gave was very easy to understand - too many foos!

The style issues were mostly introduced by me paring down 20,000 lines of code to 40 (and the odd C++ programmer :)

Your example is not exactly the same as the issue I'm seeing, but your example is much clearer - based on that, the following does not crash:

package Foo;
use strict;
use XML::LibXML;
use Scalar::Util qw/weaken/;
use Data::Dumper;

sub DESTROY {
        my $self=shift;
        warn "\n$self dtor";
}

sub new {
        warn "\n".__PACKAGE__." xtor";
        my $self = {};
        bless $self, __PACKAGE__;
        my $parser = XML::LibXML->new();
        my $confdoc = $parser->parse_string('<foo att1="val1"/>');
        my $root = $confdoc->documentElement();
        my @nodes = $root->findnodes('/*');
        for my $n (@nodes){
                for my $att ($n->attributes()) {
                        my $foo = $att->nodeName;
                        my ($key, $val) = (lc($att->nodeName), lc($att
+->getValue));
                        warn "$key - $val";
                }
        }
        warn __PACKAGE__." xtor COMPLETE";
        return $self;
}

package user;
sub DESTROY {Foo->new()}

bless my $self=[] => __PACKAGE__;
my $f=Foo->new();
[download]

but essentially the same code using a Foo.pm and crash.pl does:

#Foo.pm
package Foo;
use strict;
use XML::LibXML;
use Scalar::Util qw/weaken/;
use Data::Dumper;

sub DESTROY {
        my $self=shift;
        warn "\n$self dtor";
}

sub new {
        warn "\n".__PACKAGE__." xtor";
        my $self = {};
        bless $self, __PACKAGE__;
        my $parser = XML::LibXML->new();
        my $confdoc = $parser->parse_string('<foo att1="val1"/>');
        my $root = $confdoc->documentElement();
        my @nodes = $root->findnodes('/*');
        for my $n (@nodes){
                for my $att ($n->attributes()) {
                        my $foo = $att->nodeName;
                        my ($key, $val) = (lc($att->nodeName), lc($att
+->getValue));
                        warn "$key - $val";
                }
        }
        warn __PACKAGE__." xtor COMPLETE";
        return $self;
}
1;
[download]

#!/usr/bin/perl
#this is crash.pl
use Foo;
package user;
bless ($self=[]) => __PACKAGE__;
$f=Foo->new();

sub DESTROY {Foo->new()}
[download]

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