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I am using Ubuntu 20.04, locally, no remote access or anything. Still, whenever I start up paraview from the terminal, or when I run an application that uses MPI (I think it's enough if it calls MPI_Init()), then I get the error message Invalid MIT-MAGIC-COOKIE-1 key

How can I solve this?

MPI implementation: Open MPI 4.0.3

ParaView version: 5.7.0

RL-S
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2 Answers2

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The issue is caused by the libhwloc library, which is used by OpenRTE (the OpenMPI component) to explore the hardware topology of the node during the launch of parallel processes. When hwloc_topology_load() is called, libhwloc iterates over all of its available components, which are implemented as plug-ins. One of these components, gl, is responsible for gathering information about the system's graphics devices and uses X11 calls like XOpenDisplay(), which can generate the error message "Invalid MIT-MAGIC-COOKIE-1 key" if it fails to connect to the X11 server.

In many cases, this gl component is not needed on HPC clusters and can be safely disabled by setting the HWLOC_COMPONENTS environment variable to exclude it:

export HWLOC_COMPONENTS="-gl"

Alexey Medvedev
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I find that rm ~/.Xauthority and then logging out and back in works.

See the resolution to the xinit error: https://github.com/dnschneid/crouton/issues/197

More on why the situation arises: https://askubuntu.com/a/300737/1057634

According to the man pages, the ~/.Xauthority file is created automatically when you run a GUI application involving a remote server, and when you ssh using ssh -X (but if you just ssh you will get an error saying you need a .Xauthority file to be able to connect to the server).

V Li
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  • There is no remote server, I made that clear in the question: "no remote access or anything". I also don't have an .Xauthority folder. – RL-S Feb 21 '21 at 15:15
  • I don't have a remote server (remote access or anything) to my machine either. The .Xauthority file is a hidden file not a folder. – V Li Feb 26 '21 at 08:51
  • The links you provided are to now eight year old pages. A lot has happened since then, especially regarding ```xauth```. I don't have that program on my machine, and I therefore I also don't have an ```.Xauthority``` file. I've seen that answer before, it's easy to find, but it doesn't apply. – RL-S Mar 01 '21 at 00:45
  • Did you ever find a solution @RL-S ? – Tommy95 May 23 '21 at 20:20
  • No, sadly I haven't. – RL-S May 25 '21 at 10:49