The code I used is pasted here:

#!/usr/bin/perl

use warnings;
use strict;
use threads;
use threads::shared;
use Data::Dumper;
use Config;

printf "perl: %s\n", $Config{version};
printf "gcc: %s\n", $Config{gccversion};
printf "threads: %s\n", $threads::VERSION;
printf "threads::shared: %s\n", $threads::shared::VERSION;

my %hash :shared;

sub sub1 {
  sleep 1;
  print STDERR threads->tid();
  print STDERR Dumper \%hash;
}

$hash{a} = &share({});

my $th1 = threads->new('sub1');
$hash{b} = &share({});
my $th2 = threads->new('sub1');

$th1->join();
$th2->join();
[download]

I just reproduced the result:

$ ~/perl/recycleshare3
perl: 5.10.0
gcc: 4.3.2
threads: 1.67
threads::shared: 1.14
1$VAR1 = {
          'a' => {},
          'b' => {}
        };
2$VAR1 = {
          'a' => {},
          'b' => {}
        };
$ ~/perl/recycleshare3
perl: 5.10.0
gcc: 4.3.2
threads: 1.67
threads::shared: 1.14
2$VAR1 = {
          'a' => {}
        };
1$VAR1 = {
          'a' => {},
          'b' => {},
          'a' => {},
          'b' => {}
        };
[download]

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