X2Go Bug report logs - #1159
PyHoca CLI: semaphore released too many times error

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Date: Mon, 15 Jan 2024 21:04:30 +0000
Message-ID: <20240115210430.Horde.Q4ZJMwpX2dfJpLcL04qgLPT@mail.das-netzwerkteam.de>
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Michael Ledin <m.ledin@appheads.ru>, 1159@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#1159: PyHoca CLI: semaphore released too many
 times error
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Control: close -1

Hi Michael,

On  Do 16 Mär 2017 20:06:44 CET, Michael Ledin wrote:

> Package: pyhoca-cli
>
> Version: 0.5.0.2
>
>
> I'm using Archlinux and installed pyhoca-cli package from AUR.
>
> Previously I used x2goclient and created several profiles there.  
> Also I tried to use pyhoca-gui but it has the same error (bug #1158).
>
> I start x2go desktop session with:
>
>
> pyhoca-cli -P 20170316113957420 -d
>
>
> It starts successfully with log:
>
> pyhoca-cli[12140] NOTICE: preparing requested X2Go session
> pyhoca-cli[12140] (PyHocaCLI) NOTICE: preparing requested X2Go session
> pyhoca-cli[12140] (x2gosessregistry-pylib) NOTICE: registering X2Go  
> session AppHeads WAN...
> pyhoca-cli[12140] (x2goclient-pylib) NOTICE: initializing X2Go session...
> pyhoca-cli[12140] (x2gocontrolsession-pylib) NOTICE: connecting to  
> [my.server.here]:22
> pyhoca-cli[12140] (PyHocaCLI) NOTICE: give the X2Go session some  
> time to come up...
> pyhoca-cli[12140] (PyHocaCLI) INFO: X2Go session is now running, the  
> X2Go client's profile name is: AppHeads WAN
> pyhoca-cli[12140] (PyHocaCLI) INFO: X2Go session name is:  
> appheads-50-1489690847_stDXFCE_dp24
> pyhoca-cli[12140] (PyHocaCLI) NOTICE: Press CTRL+C to suspend the  
> running session...
>
>
> Then I press Ctrl+C and get an error:
>
> ^CKeyboardInterrupt
> Thu Mar 16 22:01:04 2017
> pyhoca-cli[12140] (PyHocaCLI) INFO: Suspending X2Go session  
> appheads-50-1489690847_stDXFCE_dp24
> Traceback (most recent call last):
>   File "/usr/bin/pyhoca-cli", line 423, in <module>
>     thisPyHocaCLI.MainLoop()
>   File "/usr/lib/python2.7/site-packages/pyhoca/cli/frontend.py",  
> line 601, in MainLoop
>     self._X2GoClient__suspend_session(self.x2go_session_hash)
>   File "/usr/lib/python2.7/site-packages/x2go/client.py", line 1620,  
> in suspend_session
>     return self.session_registry(session_uuid).suspend(**sessionopts)
>   File "/usr/lib/python2.7/site-packages/x2go/session.py", line  
> 2303, in suspend
>     self._lock.release()
>   File "src/gevent/_semaphore.py", line 266, in  
> gevent._semaphore.BoundedSemaphore.release  
> (src/gevent/gevent._semaphore.c:5353)
>   File "src/gevent/_semaphore.py", line 268, in  
> gevent._semaphore.BoundedSemaphore.release  
> (src/gevent/gevent._semaphore.c:5291)
> thread.error: Semaphore released too many times
>
>
> if then I'll try to resume the session (I get it name from  
> "pyhoca-cli -P 20170316113957420 -L"):
>
>
> pyhoca-cli -P 20170316113957420 -R appheads-50-1489690847_stDXFCE_dp24
>
>
> then sometimes I get the same error as above.

Unfortunately, I know too little about what version of gevent and so  
on is in ArchLinux. Sorry for not having responded to this any earlier.

On recent Debian I haven't noticed such an issue, but I know from the  
past that we had such an issue.

I will close this issue now in the process of migrating of X2Go BTS to  
X2Go GitLab's isssue tracker.

light+love
Mike

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