$ perl --version
This is perl, v5.10.0 built for i486-linux-gnu-thread-multi

$ perl -MTerm::ReadLine -le 'print $Term::ReadLine::VERSION'
1.03

$ perl -MLWP::UserAgent -le 'print $LWP::UserAgent::VERSION;'
5.829

[download]

It is as supplied with Ubuntu Karmic 9.10 except I've installed loads of modules including Term::ReadLine::GNU so I could get readline support in the debugger.

Your request for a reproducible short example led me to find that it is once I've successfully called LWP::UserAgent's get that things go wrong.

#!/usr/bin/perl -tw
use strict;
use warnings;

require 5.008008;
use Config::IniFiles;
use LWP::UserAgent;

my $ua = LWP::UserAgent->new;
$ua->env_proxy;
my $r = $ua->get('http://www.perlmonks.org');
# assuming the above works, once you've stepped on it running any debu
+gger
# command including h for help results in screens full of Insecure dep
+endency
# warnings and my code after that point does not work the same as when
+ run
# without the debugger.
die "Failed to retrieve url, " . $r->status_line . "\n"
    if (!$r->is_success);
print "hello\n";

[download]
perl -d -t /tmp/d.pl

Loading DB routines from perl5db.pl version 1.3
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(/tmp/d.pl:5):    require 5.008008;
  DB<1> n
main::(/tmp/d.pl:9):    my $ua = LWP::UserAgent->new;
  DB<1> n
main::(/tmp/d.pl:10):    $ua->env_proxy;
  DB<1> 
main::(/tmp/d.pl:11):    my $r = $ua->get('http://www.perlmonks.org');
  DB<1> 
main::(/tmp/d.pl:16):    die "Failed to retrieve url, " . $r->status_l
+ine . "\n"
main::(/tmp/d.pl:17):        if (!$r->is_success);
Insecure dependency in sprintf while running with -t switch at /usr/sh
+are/perl/5.10/overload.pm line 99.
Insecure dependency in sprintf while running with -t switch at /usr/sh
+are/perl/5.10/overload.pm line 99.
Insecure dependency in open while running with -t switch at /usr/local
+/lib/perl/5.10.0/Term/ReadLine/Gnu.pm line 620.
 at /usr/local/lib/perl/5.10.0/Term/ReadLine/Gnu.pm line 620
    Term::ReadLine::Gnu::Var::FETCH('Term::ReadLine::Gnu::Var=SCALAR(0
+x8e78258)') called at /usr/local/lib/perl/5.10.0/Term/ReadLine/Gnu.pm
+ line 298
    Term::ReadLine::Gnu::readline('Term::ReadLine=HASH(0x8df56b8)', ' 
+ DB<1> ') called at /usr/share/perl/5.10/perl5db.pl line 6414
    DB::readline('  DB<1> ') called at /usr/share/perl/5.10/perl5db.pl
+ line 2227
    DB::DB called at /tmp/d.pl line 16
Insecure dependency in sprintf while running with -t switch at /usr/sh
+are/perl/5.10/overload.pm line 99.
Insecure dependency in sprintf while running with -t switch at /usr/sh
+are/perl/5.10/overload.pm line 99.
Insecure dependency in sprintf while running with -t switch at /usr/sh
+are/perl/5.10/overload.pm line 99.
Insecure dependency in open while running with -t switch at /usr/local
+/lib/perl/5.10.0/Term/ReadLine/Gnu.pm line 656.
 at /usr/local/lib/perl/5.10.0/Term/ReadLine/Gnu.pm line 656
    Term::ReadLine::Gnu::Var::STORE('Term::ReadLine::Gnu::Var=SCALAR(0
+x8e78258)', 'Term::ReadLine::Gnu::Var=GLOB(0x8ef1638)') called at /us
+r/local/lib/perl/5.10.0/Term/ReadLine/Gnu.pm line 298
    Term::ReadLine::Gnu::readline('Term::ReadLine=HASH(0x8df56b8)', ' 
+ DB<1> ') called at /usr/share/perl/5.10/perl5db.pl line 6414
    DB::readline('  DB<1> ') called at /usr/share/perl/5.10/perl5db.pl
+ line 2227
    DB::DB called at /tmp/d.pl line 16

[download]

At this point simply typing h results in screens of dependency output and then funny things happen like break points stop working etc - as described originally.

In reply to Re^2: Problems running debugger when in taint mode by mje
in thread Problems running debugger when in taint mode by mje

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