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

["Göbbert, Jens Henrik"]

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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