X2Go Bug report logs - #757
Segfault of QDialog in a PyQt application

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From: PAILLAT Olivier SOPRA GROUP <olivier.paillat@cea.fr>
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>,
        "757@bugs.x2go.org"
	<757@bugs.x2go.org>
Subject: RE: [X2Go-Dev] Bug#757: Segfault of QDialog in a PyQt application
Thread-Topic: [X2Go-Dev] Bug#757: Segfault of QDialog in a PyQt application
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[Message part 1 (text/plain, inline)]

Hello,

Thank you for your answer.
I have made a simple python application (see the tar.gz attached) that reproduce the problem
You will need PyQt4 to run it

The command is simple 
python gui.py

if it work it open a QDialog nearly empty
If you reproduce the bug you will end with a segmentation fault with a very brief QDialog opening

Actually we have some doubts about our environment and we won't be surprised if you don't reproduce the bug with your PyQt4
But we want to close some of the paths of explanation of our bug and since it occurs only with X2Go we submit it to you

Regards




Olivier PAILLAT
Agence STIE Sud-Est

Sopra Steria
780 rue Guillibert de la Lauzière
Pichaury 2 - CS 40496
13593 Aix-en-Provence Cedex 3
France
Phone: +33 (0)4 42 25 71 46
olivier.paillat@cea.fr - www.soprasteria.com

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-----Message d'origine-----
De : Mike Gabriel [mailto:mike.gabriel@das-netzwerkteam.de] 
Envoyé : jeudi 22 janvier 2015 13:53
À : PAILLAT Olivier SOPRA GROUP; 757@bugs.x2go.org
Objet : Re: [X2Go-Dev] Bug#757: Segfault of QDialog in a PyQt application

Control: reassign -1 x2goclient
Control: reassign #758 x2goclient
Control: reassign #760 x2goclient
Control: merge -1 #758
Control: merge -1 #760
Control: tag -1 build-win32
Control: tag -1 moreinfo

Hi Olivier,

On  Do 22 Jan 2015 11:07:26 CET, PAILLAT Olivier SOPRA GROUP wrote:

> Package: client
> Version: 4.0.3.0
> Qt 4.8.6
>
> When we run our PyQt application on our Debian Wheezy computer with an 
> ssh -X connection it work fine But when we use X2Go to access the 
> computer and we run our application we've got a segmentation fault at 
> the first QDialog opening. (when we run QDialog.exec_).
> We recently update the X2Go version and before that update it was 
> working fine.
> We found at least one post that describe the same problem in January
> 2014 on your bug report site :
> X2Go Bug report logs - #410
> Segfault of _X11TransWritev in libNX_X11.so.6 with libQtGui
>
> Like suggested in this report  if we run a simple application to test 
> an opening of a dialog box it work fine with X2Go
>
> From your experience of this bugs is there any way to solve this problem ?

Please send us a little Python snippet that lets your PyQt application crash.

I am currently working on the NX code tree, so your timing for submitting this bug is quite good, right now.

Mike

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[BUG_757_QDialog.tar.gz (application/x-gzip, attachment)]

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