Re: ssh processes lingering after scp

From: Ed Arnold (era_at_ucar.edu)
Date: 10/06/04

  • Next message: Ram: "Re: Small SSH" 
    Date: Wed, 6 Oct 2004 11:39:25 -0600 (MDT)
To: Susan McConnell <susanm@jbpc.co.uk>

    On Tue, 5 Oct 2004, Susan McConnell wrote:

    > We're copying a number of files, sometimes up to 3-400, using
    > scp called from a perl script. The command issued by the perl script is:
    >
    > my $cmd = "scp $basedir/data/$basename remote.example.com:/tmp";
    > system ($cmd);
    >
    > We're finding that some ssh processes, with a PPID of 1, remain after the
    > script has completed. "ps -ef" shows:
    >
    > UID PID PPID C STIME TTY TIME CMD
    > root 12904 1 0 09:35 pts/0 00:00:00 /usr/bin/ssh -x ...
    > root 12990 1 0 09:36 pts/0 00:00:00 /usr/bin/ssh -x ...
    > root 12995 1 0 09:36 pts/0 00:00:00 /usr/bin/ssh -x ...
    > root 13000 1 0 09:36 pts/0 00:00:00 /usr/bin/ssh -x ...
    > root 13251 1 1 09:37 pts/0 00:00:00 /usr/bin/ssh -x ...
    >
    > The full command shown in each case (removed from above to prevent line
    > wrapping) is:
    >
    > /usr/bin/ssh -x -oFallBackToRsh no remote.example.com scp -t /tmp
    >
    > I've tried "shopt -s huponexit" but that hasn't resolved this. Can anyone
    > shed some light on why this is happening and how we can fix it?
    >
    > Thanks for any help or ideas.
    >
    > Sue
     
    You didn't say what kind of a system you saw this on. Was it Solaris?

    I saw these exact same symptoms on a solaris-9 box running sun's
    implementation of ssh (SUNWssh*). Since I had set MAXUPRC on that
    system, the leftover processes were causing work to come to a halt.
    But, since the system was copying files to non-sun systems, I figured
    I wouldn't be able to get support from sun on this issue, and I wasn't
    able to firmly determine the cause from sunsolve and google searches.

    I found the problem went away when I removed the sun ssh implementation,
    and installed openssh-3.9p1 to replace it.

  • Next message: Ram: "Re: Small SSH"

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