Bug 39178

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User-Agent: Mozilla/4.77 [en] (Windows NT 5.0; U)

Description of problem:
Linux 7.0 is not responding to a local telnet session consistantly.
I run the following script and get various reactions:
1 is to hang after login waiting for a prompt to be returned.
2. It runs to completion without a problem.
I'm running the stock perl shipped with 7.0 and Net::Telnet from CPAN.
I run the follwing script:
use Net::Telnet ();
$controller - 'linux.strings.com';
$cmd="ls";
@respstring = remotex($controller,$cmd);
print @respstring;
exit(0);
#===========================
sub remotex
{
$dump_log = "/tmp/dump_log";
$input_log = "/tmp/input_log";
$output_log = "/tmp/output_log";

my $username = "davidk";
my $password = "asdfghj";
my ($host,$command) = @_;
print("host=$host, command=$command\n");

my $tel = new Net::Telnet ( Host => $host,
Dump_log => $dump_log,
Input_log => $input_log,
Output_log => $output_log,
Timeout => 300,
Prompt => '/\{CDSQA\] /');
#Prompt => '/bash-2.04\$/');
#Prompt => '/tcsh /');

$tel -> login($username, $password);
my @result = $tel -> cmd($command);
return @result;
}
I might have made a typo but it works. 
If I set the prompt to [CDSQA] with bash shell it does not work - occasionally does - same with the other settings I'll mention - for bash.2-04 
~$ 
(I'm too tired to check but the bash is the same as the one returned from csh.cshrc.  For the tcsh  prompt I modified the csh.cshrc to change 
prompt to tcsh  if the tcsh is users shell.
   These would not work consistantly when telneting to my own local host.  Even to other hosts its inconsistant but very much inconsistant - 
mostly does not work on the local lhost.  
    I thought that the /etc/csh.cshrc when I used bash was screwing things up so I experimented with setting the prompt there but it did not 
work 
consistantly.  The underneath mechanics seem to want to set the prompt on a local login to bash-2.04 ~$.  The best working combination I 
could get was to set the user shell to tcsh and modify the /etc/csh.cshrc to set the prompt to tcsh  .  That worked the best for a local login but 
would still sometimes fail.  
I could not find a simmilar bug after a number of searches.


How reproducible:
Sometimes

Steps to Reproduce:
1. run bash shell
2. Keep /etc/csh.cshrc as usual
3. run script
4. ? I run the script as root but login with a non-priv user davidk, asdfghj but this does not matter. I get the same behavior regardless of the 
user 
that runs the script priv or non-priv.
5. -later, modify csh.cshrc to give a simple consistant prompt like tcsh  .  Better but still inconsistant. 
6. I have not been able to do anything to make this consistant.
	

Actual Results:  I get timed out waiting for prompt.

Expected Results:  Should run the ls command - does inconsistantly

Additional info:

For Reproducibility - its very reproducable.

I'm having this problem 4 linux 7.0 systems at work.  We run our app and nothing else.  When I run the script its the only thing running other 
than system processes.  On my home linux system which is very clean I get the same results.