FYI, here's some code. Uncomment/comment Clone/Storable, clone/dclone as reqd:

#!/usr/bin/perl -w
                                                                      
+          
use strict;
use threads;
use threads::shared;
use Clone qw(clone);
#use Storable qw(dclone);
                                                                      
+          
my (
    $thr1,  # thread handle
    $key,
    $v1, $v2, $v3, $tmp1, $tmp2,
    $key1, $key2, $key3
    );
                                                                      
+          
# pkg test
{
                                                                      
+          
    package cfg;
                                                                      
+          
    %cfg::thash = ();
    threads::shared::share(%cfg::thash);
}
                                                                      
+          
{
lock(%cfg::thash);
$tmp1 = {};
$tmp2 = {};
share($tmp1);
share($tmp2);
                                                                      
+          
                                                                      
+          
$v1="B";
$v2="2";
$cfg::thash{$v1} = $tmp1;
$cfg::thash{$v1}{$v2} = $tmp2;
$cfg::thash{$v1}{$v2}{server} ='b.a.com';
print "$cfg::thash{$v1}{$v2}{server}\n";
                                                                      
+          
$tmp1 = {};
share($tmp1);
$tmp2 = {};
share($tmp2);
                                                                      
+          
$v1='A';
$v2='1';
$cfg::thash{$v1} = $tmp1;
$cfg::thash{$v1}{$v2} = $tmp2;
$cfg::thash{$v1}{$v2}{server} ='a.a.com';
print "$cfg::thash{$v1}{$v2}{server}\n";

print "$cfg::thash{'B'}{'2'}{server}\n";
                                                                      
+          
$tmp1 = {};
share($tmp1);
$tmp2 = {};
share($tmp2);
$v1='C';
$v2='3';
$cfg::thash{$v1} = $tmp1;
$cfg::thash{$v1}{$v2} = $tmp2;
$cfg::thash{$v1}{$v2}{server} ='c.a.com';
                                                                      
+          
}

for $key1 (sort keys %cfg::thash)
{
    print "ISP:$key1\t";
    for $key2 (sort keys %{$cfg::thash{$key1}} )
    {
        print "RANK:$key2\t";
        for $key3 (sort keys %{$cfg::thash{$key1}{$key2}})
        {
            print "$key3 $cfg::thash{$key1}{$key2}{$key3}\n";
        }
    }
}
                                                                      
+          
                                                                      
+          
$thr1 = threads->new(\&sub5, "one");
exit;
                                                                      
+          

sub sub5
{
    my $thr = $_[0];
    my %thash=();
    my $key ='test';
    while (1)
    {
        {
        lock(%cfg::thash);
        print "Before: thread $thr: thash  = $cfg::thash{'A'}{'1'}{ser
+ver}\n";
        print "After: thread $thr: thash  = $cfg::thash{'B'}{'2'}{serv
+er}\n";
#       $thash{$key} = dclone($cfg::thash{'B'});
       $thash{$key} = clone($cfg::thash{'B'});
        }
    }
}
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