[Paraview] pv_web_visualizer.py segmentation fault when loading a pvsm file

[Jose Luis Cercós]

Hi community!

In Paraview 4.4.0, 5.1.0, and 5.1.2, I'm having a weird error (I don't know
if other versions are affected as well)... After launching the ParaViewWeb
visualizer script:

./bin/pvpython
./lib/paraview-5.1/site-packages/paraview/web/pv_web_visualizer.py
--content ./share/paraview-5.1/www --data-dir /PATH_TO_THE_FILES/ --port
8080

Connecting with it (http://localhost:8080/apps/Visualizer/), loading a pvsm
file, and reloading the web page (to close the connection and the
ParaViewWeb visualizer instance), I'm receiving a segmentation fault:

(...)
2016-08-31 12:39:23+0200 [twisted.web.server.Site] (TCP Port 8080 Closed)
2016-08-31 12:39:23+0200 [twisted.web.server.Site] Stopping factory
<twisted.web.server.Site instance at 0x7ff8117d1908>
2016-08-31 12:39:23+0200 [HTTPChannel,6,127.0.0.1] connection_lost:
connection count = 0
2016-08-31 12:39:23+0200 [HTTPChannel,6,127.0.0.1] Starting timer, process
will terminate in: 300sec
2016-08-31 12:39:23+0200 [-] Main loop terminated.
*Segmentation fault (core dumped)*

However, it is not happening if I manually load the data and reproduce all
the process (In such case it is just logging "Main loop terminated" and
conveniently closing the app)

The half good news are that, in Paraview >= 5.1.0 at least it is ever
terminating (with the segfault), while in Paraview 4.4 it may become hanged
(instead of crashing).

Someone else with the same problem? Any idea to fix that?

Thanks!
Pepe
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