[Paraview-developers] xdisplay-test + display=1 => segfault

["Göbbert, Jens Henrik"]

Hi Utkarsh,

you are right - I forgot to set the threshold to 0 before testing.
Now it crashes when opening a new render view.

We tested different versions of the NVIDIA driver already - they all behave the same way.
Any hints how to track this error down?

Best,
Jens Henrik

________________________________________
From: Utkarsh Ayachit [utkarsh.ayachit at kitware.com]
Sent: Thursday, May 11, 2017 3:21 PM
To: Göbbert, Jens Henrik
Cc: paraview-developers at paraview.org
Subject: Re: [Paraview-developers] xdisplay-test + display=1 => segfault

Jens,

One final thing, can you ensure that you're doing remote rendering
when you're closing/creating render views i.e. make sure your Remote
Render Threshold is set to 0 before you try the test  I suggested.

On Thu, May 11, 2017 at 4:37 AM, "Göbbert, Jens Henrik"
<j.goebbert at fz-juelich.de> wrote:
> Hello Utkarsh,
>
> thank you for the hint.
> I checked if ParaView/5.3.0 (connected to 12 pvservers on the same node) crashes, if I close the render view and open a new one. This is not the case - I can close and open render views multiple times without problems (as long as I have called pvserver with "--disable-xdisplay-test").
>
> Best,
> Jens Henrik
>
> P.S:
> In this context I would like to mention this bugreport:
> If using VirtualGL and NVIDIA driver in non-GLVND style ParaView 5.3.0 segfaults on startup (even without pvservers).This is not the case with the driver in GLVND style.
> "Segfault with ParaView 5.3.0RC2" - https://github.com/VirtualGL/virtualgl/issues/44
>
> ________________________________________
> From: Utkarsh Ayachit [utkarsh.ayachit at kitware.com]
> Sent: Wednesday, May 10, 2017 7:24 PM
> To: Göbbert, Jens Henrik
> Cc: paraview-developers at paraview.org
> Subject: Re: [Paraview-developers] xdisplay-test + display=1 => segfault
>
> Jens,
>
> Can you try closing current render view and creating new view? Does
> that fail even when you pass `--disable-xdisplay-test`? In my
> experience, whenever I have seen a crash in pvserver startup which can
> be circumvented by `--disable-xdisplay-test`, it's been a driver bug
> with creating multiple opengl contexts.
>
> Utkarsh
>
> On Wed, May 10, 2017 at 11:51 AM, "Göbbert, Jens Henrik"
> <j.goebbert at fz-juelich.de> wrote:
>> Hello ParaView-Team,
>>
>> we recently have experienced reproducible a segfaults of Xorg on display=1
>> (on CentOS 7.2 server with two NVIDIA Tesla K40), when used with:
>> --server--
>>   parallel ParaView/5.3.0 session (compiled with VTK_USE_X)
>>   over turboVNC(2.1.1) +VirtualGL(2.2.1)
>> --client--
>>   from a Windows7 client
>>   with turboVNC(2.1.1)
>> (other versions of turboVNC and VirtualGL led to the same
>>
>> This crash does _NOT_ happen, if the vncviewer(yes: vncVIEWER!) is running
>> on a Linux machine.
>> As soon as ParaView GUI (running on the server with turboVNC+VirtualGL, too)
>> connects to the pvservers running on the same machine, at least one of the
>> pvservers on display=1 crashes (MPI leads then to a stop of the other
>> pvservers).
>> The crash of the pvserver on display 1 leads to a crash of Xorg of display 1
>> - or it is the other way round.
>>
>> We found that this crash can be avoided by starting the pvservers with the
>> flag "--disable-xdisplay-test"
>> I report this here, as it took some time to stumble over the flag
>> "--disable-xdisplay-test" and this mail might help someone else.
>> It seems as if the xdisplay-test is doing some nasty stuff ...
>>
>> As this bug is related to the OS(=Windows) of the client running turboVNC
>> the xdisplay-test might trigger a bug in turboVNC or Xorg itself...
>>
>> Best,
>> Jens Henrik
>>
>> P.S:
>> We have tested this with older ParaView versions, too (5.2.0 and 5.1.2) and
>> got the same segfaults of Xorg of display 1.
>> The only difference was, that ParaView 5.3.0 results in a segfault when
>> connecting and ParaView 5.2.0+5.1.2 results in segfaults when loading data.
>>
>>
>>
>>
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