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

["Göbbert, Jens Henrik"]

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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