Hello, this is Joseph Huckaby, author of DBM::Deep. I was able to reproduce the crash in WinXP ActivePerl 5.8.7 + Net::FTP WITHOUT using DBM::Deep at all. All you have to do is: 
#!/usr/bin/perl

use strict;
use warnings;
use Net::FTP;

$| = 1;

my $words_all = {
  kosovar => [qw(33 35 28 44)],
};

my %pack;
  
while (my ($word, $url_list) = each %{$words_all}){
  my $url_list_packed = pack 'v*', @{$url_list};
  $pack{$word} = $url_list_packed;
}

warn "calling isa on kosovar\n";
warn UNIVERSAL::isa($pack{'kosovar'}, "ARRAY") . "\n";

warn "you should never see this, because it crashed.\n";

[download]
The crash occurs when you call isa() on the kosovar key in the hash. This should be a perfectly valid call, which should return true. Instead, it crashes the VM. I conclude that this is probably a bug in Net::FTP, or ActiveState Perl on WinXP.

In reply to Re^4: A Net::FTP and DBM::Deep clash by kenridge
in thread A Net::FTP and DBM::Deep clash by wfsp

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