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"MG" == Mike Gabriel <mike.gabriel@das-netzwerkteam.de> writes:

MG> Hi,
MG> On  Di 28 Okt 2014 15:28:53 CET, hanak wrote:

>>> Hi all,
>>> 
>>> I have a problem with an newly installed pyhoca-gui
>>> 
>>> while I can connect from an debian-wheezy with pyhoca-gui
>>> 0.4.0.9 without problems, an newly installed pyhoca-gui at
>>> another computer with version 0.5.0.2 pyhoca-gui freezes at the
>>> moment when it tries to establish the ssh connection.
>> 
>> I confirm exactly the same behavior on debian-wheezy when running
>> pyhoca-cli.
>> 
>> While on pyhoca-cli 0.4.0.2-1 (pyhoca-x2go 0.4.0.9-1) everything
>> works without problems, on pyhoca-cli 0.5.0.1-1 (python-x2go
>> 0.5.0.1-1) connection freezes with exactly the same debug...
>> 
>> Best regards
>> 
>> Pavel

MG> can anyone of you send me an obfuscated ~/.x2goclient/sessions
MG> file?

Actually I tried it with an empty ~/.x2goclient/sessions file because I used only parameters given on command line, like this:

pyhoca-cli --server testserver -u demouser -c xterm --libdebug -d

and the output was:

Xlib.protocol.request.QueryExtension pyhoca-cli[11421] NOTICE: preparing requested X2Go session pyhoca-cli[11421] (PyHocaCLI) NOTICE: preparing requested X2Go session pyhoca-cli[11421] (x2goinifiles-pylib) INFO: proposed config files are ['/home/demouser/.x2goclient/sessions'] pyhoca-cli[11421] (x2goinifiles-pylib) INFO: config files found: ['/home/demouser/.x2goclient/sessions'] pyhoca-cli[11421] (x2goinifiles-pylib) INFO: proposed config files are ['/home/demouser/.x2goclient/settings'] pyhoca-cli[11421] (x2goinifiles-pylib) INFO: config files found: ['/home/demouser/.x2goclient/settings'] pyhoca-cli[11421] (x2goinifiles-pylib) INFO: proposed config files are ['/home/demouser/.x2goclient/printing'] pyhoca-cli[11421] (x2goinifiles-pylib) INFO: config files found: ['/home/demouser/.x2goclient/printing'] pyhoca-cli[11421] (x2gosession-pylib) DEBUG: X2Go control session parameters for profile Pyhoca-Client_Session: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: username: demo pyhoca-cli[11421] (x2gosession-pylib) DEBUG: key_filename: /home/demouser/.ssh/id_rsa pyhoca-cli[11421] (x2gosession-pylib) DEBUG: unique_hostkey_aliases: False pyhoca-cli[11421] (x2gosession-pylib) DEBUG: look_for_keys: True pyhoca-cli[11421] (x2gosession-pylib) DEBUG: allow_agent: True pyhoca-cli[11421] (x2gosession-pylib) DEBUG: X2Go terminal session parameters for profile Pyhoca-Client_Session: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: client_encoding: UTF-8 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: set_session_title: False pyhoca-cli[11421] (x2gosession-pylib) DEBUG: snd_system: pulse pyhoca-cli[11421] (x2gosession-pylib) DEBUG: session_type: application pyhoca-cli[11421] (x2gosession-pylib) DEBUG: server_encoding: UTF-8 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: snd_port: 4713 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: rdp_server: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: kbtype: pc105/us pyhoca-cli[11421] (x2gosession-pylib) DEBUG: applications: ['WWWBROWSER', 'MAILCLIENT', 'OFFICE', 'TERMINAL'] pyhoca-cli[11421] (x2gosession-pylib) DEBUG: published_applications: False pyhoca-cli[11421] (x2gosession-pylib) DEBUG: link: adsl pyhoca-cli[11421] (x2gosession-pylib) DEBUG: xdmcp_server: localhost pyhoca-cli[11421] (x2gosession-pylib) DEBUG: kbvariant: null pyhoca-cli[11421] (x2gosession-pylib) DEBUG: geometry: 800x600 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: rdp_options: -u X2GO_USER -p X2GO_PASSWORD pyhoca-cli[11421] (x2gosession-pylib) DEBUG: cmd: xterm pyhoca-cli[11421] (x2gosession-pylib) DEBUG: convert_encoding: False pyhoca-cli[11421] (x2gosession-pylib) DEBUG: clipboard: both pyhoca-cli[11421] (x2gosession-pylib) DEBUG: kblayout: us pyhoca-cli[11421] (x2gosession-pylib) DEBUG: session_title: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: pack: 16m-jpeg-9 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: X2Go sshproxy parameters for profile Pyhoca-Client_Session: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_host: proxyhost.mydomain pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_port: 22 pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_look_for_keys: True pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_allow_agent: True pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_key_filename: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: sshproxy_user: pyhoca-cli[11421] (x2gosession-pylib) DEBUG: initializing X2GoControlSession pyhoca-cli[11421] (x2gosessregistry-pylib) NOTICE: registering X2Go session Pyhoca-Client_Session... pyhoca-cli[11421] (x2gosessregistry-pylib) DEBUG: registering X2Go session with UUID 95df0fac-5ee4-11e4-8bae-d4bed9957790 pyhoca-cli[11421] (x2goclient-pylib) NOTICE: initializing X2Go session... pyhoca-cli[11421] (x2gocontrolsession-pylib) NOTICE: connecting to [testserver]:22 pyhoca-cli[11421] (x2gocontrolsession-pylib) DEBUG: trying SSH key discovery or agent authentication with server

Here there was a freeze...

MG> Plus: what openSSH server version is installed on the X2Go Server?

openssh-server 1:6.0p1-4+deb7u2

The problem occurs only when running the client based on python-x2go. There is no problem using x2goclient binary.

Pavel

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"MG" == Mike Gabriel <mike.gabriel@das-netzwerkteam.de> writes:

Hi Mike.

MG> I am so sorry, guys, but I cannot reproduce the issue here. As I
MG> said earlier. I observed those hangs once or twice, but wasn't
MG> able to reproduce them.

MG> I tested pyhoca-gui on jessie and on wheezy (+ some backports)
MG> and things worked out fine.

MG> I connected to servers of several Debian and Ubuntu versions.

MG> A bit clueless, sorry...

MG> Mike

PS> you could try to dive in the python code of python-x2go, though.
PS> The connection is established
MG> somewhere around [1] (see [2] for the full API docs). You could
MG> try to add extra debugging output there, so that you can narrow
MG> down where the connection actually really freezes.

Tried to trace it with pdb. There is a neverending cycling in paramiko code here:

/usr/lib/python2.7/dist-packages/paramiko/transport.py(402)start_client() -> event.wait(0.1) (Pdb) list 397 398 # synchronous, wait for a result 399 self.completion_event = event = threading.Event() 400 self.start() 401 while True: 402 -> event.wait(0.1) 403 if not self.active: 404 e = self.get_exception() 405 if e is not None: 406 raise e 407 raise SSHException('Negotiation failed.')

So I will try to find out, why there is no such problem with python-x2go 0.4.0.9-1 although paramiko version is the same...

Pavel

MG> [1]
http> //code.x2go.org/doc/python-x2go/x2go.backends.control.plain-pysrc.html#X2GoControlSession.connect
MG> [2] http://code.x2go.org/doc/python-x2go/

Am 29.10.2014 17:13, schrieb Pavel Hanák:

Hi Mike,

The problem is in the version of python-gevent package which was still from stable version (0.13.6-1+nmu3). With testing version (1.0.1-1) everything works as expected.

So it would be useful to change Depends field in debian/control accordingly...

Pavel

---

x2go-user mailing list x2go-user@lists.x2go.org http://lists.x2go.org/listinfo/x2go-user

Hi Mike,

thanks for investigations.

You use the heuler section?

I tried to debug it today too (but without real python knowledge ;-( ) - and I triggered it down to this location in

paramiko/packet.py

def readline(self, timeout):
    print "packetizer debug 1 *********"
    """
    Read a line from the socket.  We assume no data is pending after the
    line, so it's okay to attempt large reads.
    """
    buf = self.__remainder
    while not linefeed_byte in buf:
        buf += self._read_timeout(timeout)
    n = buf.index(linefeed_byte)
    self.__remainder = buf[n + 1:]
    buf = buf[:n]
    if (len(buf) > 0) and (buf[-1] == cr_byte_value):
        buf = buf[:-1]
    return u(buf)

it hangs after the line 281

        buf += self._read_timeout(timeout)

no idea why and if this is related to your findings.

Installed the python-gevent from heuer and everythin works.

Thanks. Jan

Package: python-x2go Sevrity: important

Hi Pavel, Jan,

TL;DR; for the bug tracker... Python X2Go 0.5.0.x freezes during
X2GoControlSession.connect() when used with gevent 0.13.6. With Python
0.4.0.x no such freeze could be observed.

On Mi 29 Okt 2014 10:24:53 CET, Mike Gabriel wrote:

Hi Pavel, hi Jan,

On Di 28 Okt 2014 16:00:34 CET, Mike Gabriel wrote:

...

Hi,

On Di 28 Okt 2014 15:28:53 CET, hanak wrote:

...

...

Hi all,

I have a problem with an newly installed pyhoca-gui

while I can connect from an debian-wheezy with pyhoca-gui 0.4.0.9 without problems, an newly installed pyhoca-gui at another computer with version 0.5.0.2 pyhoca-gui freezes at the moment when it tries to establish the ssh connection.

I confirm exactly the same behavior on debian-wheezy when running pyhoca-cli.

While on pyhoca-cli 0.4.0.2-1 (pyhoca-x2go 0.4.0.9-1) everything works without problems, on pyhoca-cli 0.5.0.1-1 (python-x2go 0.5.0.1-1) connection freezes with exactly the same debug...

Best regards

Pavel

can anyone of you send me an obfuscated ~/.x2goclient/sessions file?

Plus: what openSSH server version is installed on the X2Go Server?

Mike

I am so sorry, guys, but I cannot reproduce the issue here. As I
said earlier. I observed those hangs once or twice, but wasn't able
to reproduce them.

I tested pyhoca-gui on jessie and on wheezy (+ some backports) and
things worked out fine.

I connected to servers of several Debian and Ubuntu versions.

A bit clueless, sorry...

Mike

I have a system that exhibits the same behaviour, as described by you!
A Ubuntu precise system with python-gevent (I obviously did not
provide a newer gevent version for precise in our X2Go PPA on
Launchpad).

I will join in to get this narrowed down.

Mike

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