X2Go Bug report logs - #410
Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui

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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: Sven Willenberger <swillenberger@upsicorp.com>

Date: Fri, 24 Jan 2014 02:50:02 UTC

Severity: normal

Merged with 113, 467

Found in version 3.5.0.22

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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From: owner@bugs.x2go.org (X2Go Bug Tracking System)
Subject: Bug#410 closed by Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
 (Re: Bug#410: Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui)
Message-ID: <handler.410.c.140415858023235.notifdone@bugs.x2go.org>
References: <20140630200258.Horde.6gkZyskLK2m7TMK0dshuGw6@mail.das-netzwerkteam.de>
X-X2go-PR-Message: they-closed 410
X-X2go-PR-Package: nxagent
X-X2go-PR-Source: nx-libs
Date: Mon, 30 Jun 2014 20:05:02 +0000
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This is an automatic notification regarding your Bug report
which was filed against the nxagent package:

#410: Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui

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.


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Contact owner@bugs.x2go.org with problems
[Message part 2 (message/rfc822, inline)]
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Sven Willenberger <swillenberger@upsicorp.com>
Cc: 410@bugs.x2go.org, control@bugs.x2go.org
Subject: Re: Bug#410: Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui
Date: Mon, 30 Jun 2014 20:02:58 +0000
[Message part 3 (text/plain, inline)]
close #410
close #113
close #467
thanks

Hi Sven,

On  Mo 30 Jun 2014 15:32:14 UTC, Sven Willenberger wrote:

>> """ (quoted from above...)
>> +       # Provide means for Xinerama support in NX/X2Go sessions. This
>> +       # This also requires two post-install symlinks:
>> +       # (DESTDIR)$(NXLIBDIR)/X11/Xinerama/libNX_X11.so.6 ->
>> /usr/<libdir>/libX11.so.6
>> +       # (DESTDIR)$(NXLIBDIR)/X11/Xinerama/libNX_Xext.so.6 ->
>> /usr/<libdir>/libXext.so.6
>> """

> I went ahead and changed the PKGBUILD file (Archlinux's package
> building spec file) to include the symlinks as you pointed out (and as
> are contained as comments in the Makefile) and rebuilt the package. It
> works!! (pyQt, PySide, vlc all work now). That was the fix that was
> needed and will report this to the package maintainers.

Great that we could track this down...

@all: X2Go BTS issues #113, #410 and #467 have been identified as  
packaging issues on Archlinux. For further reference, see here:

https://bugs.archlinux.org/task/41037

Sven, thanks for your help and providing your distro-specific  
expertise on this...
Mike
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From: Sven Willenberger <swillenberger@upsicorp.com>
To: submit@bugs.x2go.org
Subject: Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui
Date: Thu, 23 Jan 2014 21:39:19 -0500
Package: nx-libs (nx-x11)
Version: 3.5.0.22

Server (host)OS: Linux 3.12.8 (ArchLinux) x86_64
Client OS: Windows 8 (version 4.0.1.2 QT 4.8.5)

When using python apps with QT (either PyQT or PySide), any interaction
with the resulting window (when connected from windows to linux) causes
the program to crash. Partial stack trace:

#0  0x00007fffed78acb0 in _X11TransWritev () from /usr/lib/nx/X11/libNX_X11.so.6
#1  0x00007fffed76eb8e in _XSend () from /usr/lib/nx/X11/libNX_X11.so.6
#2  0x00007fffed763e69 in XQueryExtension () from /usr/lib/nx/X11/libNX_X11.so.6
#3  0x00007fffed759af2 in XInitExtension () from /usr/lib/nx/X11/libNX_X11.so.6
#4  0x00007fffeda3d7bb in XextAddDisplay () from /usr/lib/nx/X11/libNX_Xext.so.6
#5  0x00007fffedc4cee1 in XPanoramiXQueryExtension () from /usr/lib/nx/X11/Xinerama/libXinerama.so.1
#6  0x00007ffff0e01e3e in ?? () from /usr/lib/python3.3/site-packages/PySide-1.2.1-py3.3.egg/PySide/libQtGui.so.4
#7  0x00007ffff0e01f42 in QDesktopWidget::QDesktopWidget() () from /usr/lib/python3.3/site-packages/PySide-1.2.1-py3.3.egg/PySide/libQtGui.so.4

This just happened with the Jan 4 update to nx-libs (et al).

For comparison, using a basic ssh connection with X-forwarding and
starting an xterm session and running the same python programs succeeds.

-- 
Sven Willenberger
United Pay Systems International
http://www.upsicorp.com

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