X2Go Bug report logs - #637
Qt5 apps crash at startup on Linux host

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Package: nxagent; Maintainer for nxagent is X2Go Developers <x2go-dev@lists.x2go.org>; Source for nxagent is src:nx-libs.

Reported by: André Wöbbeking <Woebbeking@web.de>

Date: Fri, 10 Oct 2014 23:10:01 UTC

Severity: important

Tags: confirmed, fixed-upstream, moreinfo

Merged with 78

Found in version

Fixed in version

Forwarded to https://github.com/ArcticaProject/nx-libs/pull/137

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#637 closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 (Re: [X2Go-Dev] Bug#673: GUI-based Applications stall when x2go session is
Message-ID: <handler.637.b637.143169344512214.notifdone@bugs.x2go.org>
References: <20150515123722.Horde.fqPCVHT-NDSwTB7j9E8aJg1@mail.das-netzwerkteam.de>
X-X2go-PR-Keywords: confirmed moreinfo
X-X2go-PR-Message: they-closed 637
X-X2go-PR-Package: nxagent
X-X2go-PR-Source: nx-libs
Date: Fri, 15 May 2015 12:40:02 +0000
Content-Type: multipart/mixed; boundary="----------=_1431693602-13064-0"
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This is an automatic notification regarding your Bug report
which was filed against the nxagent package:

#637: Qt5 apps crash at startup on Linux host

It has been closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Mike Gabriel <mike.gabriel@das-netzwerkteam.de> by
replying to this email.

637: http://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=637
X2Go Bug Tracking System
Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Jerry Rabe <jdr@wi.rr.com>
Cc: 637@bugs.x2go.org
Subject: Re: [X2Go-Dev] Bug#673: GUI-based Applications stall when x2go session is suspended
Date: Fri, 15 May 2015 12:37:22 +0000
[Message part 3 (text/plain, inline)]
Control: close -1

Re-Cc:ing #637 (got dropped off from the list of recipients with the  
previous post)

Closing this issue on user request. I remember to have seen something  
similar in X2Go sessions, but some tests today confirm that there is  
no such issue on my setups.


On  Fr 09 Jan 2015 04:02:12 CET, Jerry Rabe wrote:

> Mike,
> As it turns out, it was just yesterday that I found that this bug
> seems to be fixed in the latest version!  My post actually was
> incorrect in that I had observed the issue on x2goserver package
> instead of (at that time anything above
> wasn't working due to some unknown system incompatibility).  But
> yesterday I did a full system "yum update" on all three of our Centos
> 7 machines, and not only is x2goserver working well,
> but the GUI hang issue is now non-existent!  From my perspective, you
> can move this issue to closed.
> You are doing a wonderful job on this project, and it is very
> impressive.  Thank you.
> One other thing I just noticed.  If the system goes down ungracefully,
> the x2go fuse-based shared drives do not get unmounted, and
> subsequently will not re-mount after a reboot.  I finally fixed it by
> removing /var/lib/x2go/x2go_sessions and re-installing x2goserver.  Is
> there an easier way to fix this?
> --
> Jerry Rabe
> On Thu, Jan 8, 2015 at 4:47 PM, Mike Gabriel
> <mike.gabriel@das-netzwerkteam.de> wrote:
>> Control: reassign -1 nxagent
>> Control: severity -1 important
>> HI Jerry,
>> On  Do 13 Nov 2014 17:12:23 CET, Jerry Rabe wrote:
>>> When an x2go session is suspended, any running GUI-based application
>>> will stall as soon as it tries to update graphical information in the
>>> GUI.  This was not the case with the old freenx server, and it is a
>>> problem for large jobs that take a long time to run.  Not sure if this
>>> is just a configuration/install problem.
>>> What does NOT stall:
>>>  - Text-based output from command line-based shell scripts.
>>>  - GUI-based applications running in suspended x2go sessions as
>>> Published Applications.
>>> What DOES Stall:
>>>  - GUI-based applications running in suspended x2go sessions (accessed
>>> by X2GoClient) on a Linux Desktop (i,.e. MATE, XFCE)
>>>  - GUI-based applications running in suspended NX sessions (accessed
>>> by an NX3 client) on a Linux Desktop (i,.e. MATE, XFCE)
>>> The steps taken to produce the bug:
>>>  - Start a GUI-based Application (for testing, use the Linux System
>>> Monitor, open the "Resources" tab)
>>>  - Suspend the x2go session.
>>>  - Some time later, resume the session.  The GUI now continues
>>> running, but it had stalled while the session was suspended.
>>> The client machine's OS: Windows 7 SP1
>>> The client machine's version of X2GoClient:
>>> The server's OS: Centos 7
>>> The server's version of the x2goserver package:  x86_64
>>> The server's version of the x2goserver-xsession package:
>>> x86_64
>>> The server's version of the nxagent package: x86_64
>> this is an issue that needs to be addressed soon.
>> Reassigning to nxagent package and raising severity...
>> Mike


mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de

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[Message part 5 (message/rfc822, inline)]
From: André Wöbbeking <Woebbeking@web.de>
To: submit@bugs.x2go.org
Subject: Qt5 apps crash at startup on Linux host
Date: Sat, 11 Oct 2014 01:03:06 +0200
Package: x2goserver


Any Qt 5.3 app starting on a Linux host crashes with this backtrace:

__lll_unlock_elision                elision-unlock.c:29
XIQueryVersion                      XIQueryVersion.c:47
QXcbConnection::initializeXInput2   qxcbconnection_xi2.cpp:84
QXcbConnection::QXcbConnection	    qxcbconnection.cpp:336
QXcbIntegration::QXcbIntegration    qxcbintegration.cpp:161
QXcbIntegrationPlugin::create       qxcbmain.cpp:58

These apps run fine locally.

I also get this warning before the apps crash:

xcb_randr_get_output_primary_reply_t *primary =
        xcb_randr_get_output_primary_reply(xcb_connection(), primaryCookie, 
if (!primary || error) {
    qWarning("QXcbConnection: Failed to get the primary output of the 

And xrandr prints:

"xrandr: Failed to get size of gamma for output default"

I'm using current Debian testing.


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