RE: ssh hanging with -f option

RE: ssh hanging with -f option

[Peter Ring]

I just installed the cygwin1.dll snapshot from the 4. of Sep.

Can you also start an rxvt terminal like this

  ssh -v -X -f someserver rxvt

While I can log in with ssh -X someserver and then start an rxvt on a local
X server (Cygwin/XFree, BTW), I can't use the -f option. I get:

...
debug1: Requesting X11 forwarding with authentication spoofing.
debug1: Sending command: rxvt
debug1: channel 0: open confirm rwindow 0 rmax 16384
debug1: channel 0: read<=0 rfd 4 len 0
debug1: channel 0: read failed
debug1: channel 0: input open -> drain
debug1: channel 0: close_read
debug1: channel 0: input: no drain shortcut
debug1: channel 0: ibuf empty
debug1: channel 0: input drain -> closed
debug1: channel 0: send eof
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: channel 0: rcvd eof
debug1: channel 0: output open -> drain
debug1: channel 0: rcvd close
debug1: channel 0: obuf empty
debug1: channel 0: output drain -> closed
debug1: channel 0: close_write
failed to load libX11.dll
debug1: channel 0: send close
debug1: channel 0: is dead
debug1: channel_free: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i8/0 o128/0 fd -1/-1)

debug1: channel_free: channel 0: dettaching channel user
debug1: Transferred: stdin 0, stdout 0, stderr 0 bytes in 0.5 seconds
debug1: Bytes per second: stdin 0.0, stdout 0.0, stderr 0.0
debug1: Exit status 1


The cygwin installation is up-to-date + cygwin-inst-20010904.tar.bz2 (and
the X is the most recent + XWin-Test48).

Kind regards
Peter Ring

-----Original Message-----
From: Karl M [ mailto:karlm30@hotmail.com ]
Sent: Saturday, September 01, 2001 6:29 PM
To: cygwin@cygwin.com
Subject: Re: ssh hanging with -f option


Hi All...

I just confirmed that the latest snapshot of cygwin1.dll eliminates the 
hanging problem problem in ssh. In particular,

./ssh -f localhost sleep 10

works fine.

Thanks,

...Karl

>From: Corinna Vinschen <vinschen@redhat.com>
>Reply-To: cygwin <cygwin@cygwin.com>
>To: cygwin@cygwin.com
>Subject: Re: ssh hanging with -f option
>Date: Fri, 31 Aug 2001 00:12:21 +0200
>
>On Wed, Aug 29, 2001 at 07:30:52AM -0700, Karl M wrote:
> > Hi All...
> >
> > Can someone else take a look at debugging this? In a win2k environment,
> >
> > ssh -f localhost sleep 10
> >
> > or
> >
> > ssh -f localhost echo test
> >
> > for example hang with all of the current released software. See below 
>for
> > more deails.
>
>Eventually we found the problem in Cygwin which causes that effect.
>Try the current Cygwin from CVS or the next developers snapshot.
>
>Corinna
>
>--
>Corinna Vinschen                  Please, send mails regarding Cygwin to
>Cygwin Developer                                mailto:cygwin@cygwin.com
>Red Hat, Inc.
>
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RE: ssh hanging with -f option

[Peter Ring]

OK I got it ... of course sshd must have a PATH that includes
/usr/X11R6/bin, and it didn't (tested with ssh -f someserver "echo \$PATH".
So I added a key named PATH in ..\Services\sshd\Parameters\Environment with
a string value that includes /usr/X11R6/bin, stopped and started sshd, and
Voila! almost success. I have to introduce a small pause like this:

  ssh -X -f 10.10.2.131 "sleep 5; rxvt"

but who cares.

As an aside, should I want to be able to start win32 gui applications on the
remote end, what priviliges must sshd have?

Kind regards
Peter Ring


-----Original Message-----
From: Peter Ring [ mailto:pri@magnus.dk ]
Sent: Thursday, September 06, 2001 1:48 PM
To: cygwin@cygwin.com
Subject: RE: ssh hanging with -f option


I just installed the cygwin1.dll snapshot from the 4. of Sep.

Can you also start an rxvt terminal like this

  ssh -v -X -f someserver rxvt

While I can log in with ssh -X someserver and then start an rxvt on a local
X server (Cygwin/XFree, BTW), I can't use the -f option. I get:

<snip>

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Re: ssh hanging with -f option

[Jason Tishler]

Corinna,

On Fri, Aug 31, 2001 at 12:12:21AM +0200, Corinna Vinschen wrote:
> On Wed, Aug 29, 2001 at 07:30:52AM -0700, Karl M wrote:
> > Can someone else take a look at debugging this? In a win2k environment,
> > 
> > ssh -f localhost sleep 10
> > 
> > or
> > 
> > ssh -f localhost echo test
> > 
> > for example hang with all of the current released software. See below for 
> > more deails.
> 
> Eventually we found the problem in Cygwin which causes that effect.
> Try the current Cygwin from CVS or the next developers snapshot.

I'm not sure if the above is related, but the following:

    http://www.cygwin.com/ml/cygwin-developers/2001-08/msg00126.html

appears to be fixed in the latest Cygwin CVS too.

Thanks,
Jason

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Re: ssh hanging with -f option

[Karl M]

Hi All...

I just confirmed that the latest snapshot of cygwin1.dll eliminates the 
hanging problem problem in ssh. In particular,

./ssh -f localhost sleep 10

works fine.

Thanks,

...Karl

>From: Corinna Vinschen <vinschen@redhat.com>
>Reply-To: cygwin <cygwin@cygwin.com>
>To: cygwin@cygwin.com
>Subject: Re: ssh hanging with -f option
>Date: Fri, 31 Aug 2001 00:12:21 +0200
>
>On Wed, Aug 29, 2001 at 07:30:52AM -0700, Karl M wrote:
> > Hi All...
> >
> > Can someone else take a look at debugging this? In a win2k environment,
> >
> > ssh -f localhost sleep 10
> >
> > or
> >
> > ssh -f localhost echo test
> >
> > for example hang with all of the current released software. See below 
>for
> > more deails.
>
>Eventually we found the problem in Cygwin which causes that effect.
>Try the current Cygwin from CVS or the next developers snapshot.
>
>Corinna
>
>--
>Corinna Vinschen                  Please, send mails regarding Cygwin to
>Cygwin Developer                                mailto:cygwin@cygwin.com
>Red Hat, Inc.
>
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>


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Re: ssh hanging with -f option

[Karl M]

Hi Corinna...

I'll give that a try in the next couple of days and report back.

Thanks,

...Karl

>From: Corinna Vinschen <vinschen@redhat.com>
>Reply-To: cygwin <cygwin@cygwin.com>
>To: cygwin@cygwin.com
>Subject: Re: ssh hanging with -f option
>Date: Fri, 31 Aug 2001 00:12:21 +0200
>
>On Wed, Aug 29, 2001 at 07:30:52AM -0700, Karl M wrote:
> > Hi All...
> >
> > Can someone else take a look at debugging this? In a win2k environment,
> >
> > ssh -f localhost sleep 10
> >
> > or
> >
> > ssh -f localhost echo test
> >
> > for example hang with all of the current released software. See below 
>for
> > more deails.
>
>Eventually we found the problem in Cygwin which causes that effect.
>Try the current Cygwin from CVS or the next developers snapshot.
>
>Corinna
>
>--
>Corinna Vinschen                  Please, send mails regarding Cygwin to
>Cygwin Developer                                mailto:cygwin@cygwin.com
>Red Hat, Inc.
>
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>


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Re: ssh hanging with -f option

[Corinna Vinschen]

On Wed, Aug 29, 2001 at 07:30:52AM -0700, Karl M wrote:
> Hi All...
> 
> Can someone else take a look at debugging this? In a win2k environment,
> 
> ssh -f localhost sleep 10
> 
> or
> 
> ssh -f localhost echo test
> 
> for example hang with all of the current released software. See below for 
> more deails.

Eventually we found the problem in Cygwin which causes that effect.
Try the current Cygwin from CVS or the next developers snapshot.

Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Developer                                mailto:cygwin@cygwin.com
Red Hat, Inc.

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Re: ssh hanging with -f option

[Karl M]

Hi All...

Can someone else take a look at debugging this? In a win2k environment,

ssh -f localhost sleep 10

or

ssh -f localhost echo test

for example hang with all of the current released software. See below for 
more deails.

Thanks,

...Karl

>From: "Karl M" <karlm30@hotmail.com>
>To: cygwin@cygwin.com
>Subject: ssh hanging with -f option--a workaround
>Date: Fri, 27 Jul 2001 07:08:31 -0700
>
>Hi All...
>
>I first saw the following problem with openssh-2.5.2p1 or 2.9p1. The 
>problem
>is that when I use the -f option with the ssh client, it hangs (with
>CygWin). I checked my patch file against openssh-2.9p2-3. Because several
>others have had this same problem, my updated patch is attached for anyone
>who needs to use the -f option to ssh.
>
>I don't have a solution to the ssh hanging problem when it is forked off as
>in
>
>ssh -f localhost sleep 10
>
>but have a workaround. The patch file is attached.
>
>I looked at both ssh and sshd when they hang (both in their respective
>select calls--which makes sense because they are both waiting for something
>to do). The problem is in ssh. When ssh is forked after authentication, the
>select call fails to return after the fifth time that it is invoked. This
>problem only seems to occur when ssh has invoked daemon before starting the
>interactive session, but the problem shows up four select calls later. As
>part of my debugging, I forced select to return by setting a timeout. The
>timeout does force it to return--and in fact, there is IO waiting to be
>processed. So a one second timeout in the select call is my workaround for
>now.
>
>The read and write bit masks before and after the select call always look
>fine. It is not an ssh bug as far as I can tell.
>
>ssh localhost sleep 10
>
>ssh -f localhost sleep 10
>
>are the two test cases I used for debugging--to compare the behavior.
>
>Thanks,
>
>...Karl
>
>
>
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><< OpenSSH-2.9p2-3-Hang-Patch >>
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