BrowserUK++
Same results here. Makes you wonder if there are any more 'issues'.
As far as I can tell 0.94 is the most recent version. I use DBM::Deep because it is the only one I could find that I could run/test locally and on my ISP's server (it is pure Perl).
Apart from this it's been just the ticket.
Many thanks for your help. | [reply] |
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";
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.
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Then you have my apologies for casting errant aspersions. It certainly looked like a DBM::Deep bug. Very nice module BTW.
This should be a perfectly valid call, which should return true.
Actually not. pack 'v*', 33, 35, 28, 44; is just a scalar containing some binary data. Still, it shouldn't crash when you pass it to UNIVERSAL::isa()
The problem isn't directly the fault of Net::FTP either, though it may be related, as the bug also manifests in the presence of IO::Socket. This also crashes, and again, only when a value of 33 is packed and passed:
P:\test>p1
perl> use IO::Socket;;
perl> print $_, UNIVERSAL::isa( pack( 'v*', $_ ), 'SCALAR' ) for 0 ..
+33;;
0
1
2
[...]
30
31
32
P:\test>rem It segfaulted.
So the bug appears to be that UNIVERAL::isa() attempts to use the passed value as a reference, and dies if you pass it binary data that isn't--but only if it is/contains "dirty knee", 33! And only if some networking module is loaded? Beyond that is the province of the internals guys.
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"Science is about questioning the status quo. Questioning authority".
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[d/l]
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