SSH - Abnormal CPU Usage

[Kyrre Ness Sjobak]

Just a quick question that you probably mentioned, but just to be shure:
Is the exessive usage on the server side or the client side? What are
you running trough ssh - kde? What OS etc. is the server?

Kyrre

fre, 21.10.2005 kl. 18.31 skrev Thiago Arrais:
> Ferdorians,
> 
> This is my first message to this groups, I don't really know if this
> would be the best group for my question. I am experiencing this
> problem for some time now, I hope you can help.
> 
> The main problem is that my machine is causing CPU excessive usage
> when a SSH session is closed. It does not happen when openining,
> neither during the session, but when it is closed.
> 
> I have tried to collect some evidence, here they are:
> 
> - This is what I telled the machine for this test:
> 
> $ ps -e -o pcpu,cputime,pid,args > before
> $ ssh localhost
> thiagob at localhost's password:
> id: cannot find name for group ID 74594
> $ ps -e -o pcpu,cputime,pid,args > during
> $ exit
> $ ps -e -o pcpu,cputime,pid,args > after
> 
> - Prior to the execution of the SSH client, everything is perfect with
> the processes running on the machine. I won't attach the process
> monitor report here because it is very long and doesn't add much
> information. There is almost no CPU activity prior to executing the
> client.
> 
> - After opening an SSH terminal, the CPU isn't busy. Here is the
> process status I got with the terminal opened:
> 
> $ grep ssh during
>  0.0 00:00:00  1898 /usr/sbin/sshd
>  0.0 00:00:00  2605 /usr/bin/ssh-agent startkde
>  0.4 00:00:00  4470 ssh localhost
>  0.0 00:00:00  4471 sshd: thiagob [priv]
>  0.0 00:00:00  4479 sshd: thiagob at pts/8 << This is the one that gets hungry
> 
> - After executing the `exit` command, the CPU become annoingly busy:
> 
> $ grep ssh after
>   0.0 00:00:00  1898 /usr/sbin/sshd
>   0.0 00:00:00  2605 /usr/bin/ssh-agent startkde
>   0.0 00:00:00  4471 sshd: thiagob [priv]
> 98.0 00:00:05  4479 sshd: thiagob at notty
> ^^
> 
> - These are the versions for the software:
> 
> $ ssh -V
> OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
> $ uname -a
> Linux serpro-1422052.rce.serpro 2.6.5-1.358 #1 Sat May 8 09:04:50 EDT
> 2004 i686 i686 i386 GNU/Linux
> $ bash --version
> GNU bash, version 2.05b.0(1)-release (i386-redhat-linux-gnu)
> Copyright (C) 2002 Free Software Foundation, Inc.
> 
> Some weird facts:
> - The same behavior is observer in two other machines when I open an
> SSH session from my machine
> - My logout scripts are empty on all machines, they contain at most a
> command to clena the term
> 
> I hope anyone can help.
> 
> Cheers,
> 
> Thiago Arrais