intermittent stderr

[John Dunlap]

I've just noticed that using ssh -1 always works.  The problem
is with ssh -2 from slow to fast machines. -- John

> 
> The command "ssh ls -l /doesnotexist" gives various responses:
> 
> Running from a 200 MHz PentiumPro with dsa key added to ssh-agent:
> 
> Mistakes worst to fast machine:
> To a faster 600 MHz dual processor i686 600 MHz machine:
> ls: /doesnotexist: No such file or directory  -- correct
> nothing at all                                -- wrong
> ls: select: Bad file descriptor               -- wrong
> 
> No mistakes to slower machine.
> To a slower 166 MHz i586 600 MHz machine:
> ls: /doesnotexist: No such file or directory  -- correct all the time
> 
> All machines run compiled OpenSSH-2.5.1p1 on RHL 6.2 with all
> patches, kernel 2.2.16-3.  Set up on all machines with
> ssh and sshd defaulting to ssh2 protocol.
> 
> My test script:
> 
> #!/bin/sh
> while [ 1 ]
> do
>     date
>     ssh tesla ls -l /doesnotexist
> done
> 
> Responses from fast machine are not consistent:
> 
> Thu Feb 22 14:15:35 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:37 PST 2001
> Thu Feb 22 14:15:39 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:41 PST 2001
> Thu Feb 22 14:15:43 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:45 PST 2001
> ls: select: Bad file descriptor
> Thu Feb 22 14:15:47 PST 2001
> Thu Feb 22 14:15:49 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:51 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:54 PST 2001
> ls: /doesnotexist: No such file or directory
> Thu Feb 22 14:15:56 PST 2001
> select: Bad file descriptor
> Thu Feb 22 14:15:58 PST 2001
> 
> -- 
> John Dunlap                           University of Washington
> Senior Electrical Engineer            Applied Physics Laboratory
> dunlap at apl.washington.edu             1013 NE 40th Street
> 206-543-7207, 543-1300, FAX 543-6785  Seattle, WA   98105-6698