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Advice to debug Gazebo(9) on Ubuntu 20.04 64-bit Desktop In Fusion VM

Advice how to diagnose Gazebo (gazebo9 and Ubuntu 20.04 64-bit) becoming unresponsive?

Symptom: After about three minutes with or without interaction Gazebo and the entire Ubuntu OS becomes unresponsive - cannot quit or shutdown. (I have to kill the virtual machine and then can cold-boot the VM)

My system has been very stable when running ROS2 Nodes and Rviz2, but Gazebo is causing the Ubuntu OS to become unresponsive.

I am running
- gazebo9 (9.12.0+dfsg-1build2 amd64) - (ROS2 Foxy installed but nothing running)
- on Ubuntu 20.04.2 LTS 64-bit Desktop
Linux 5.8.0-59-generic #66~20.04.1-Ubuntu SMP Thu Jun 17 11:14:10 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
- in an 8 GB Ram 3-cores available to VMware Fusion 12.1.1 virtual machine (4.7GB used when it becomes unresponsive) - on a 32GB 3.2GHz 6-Core Intel Core i7 2018 MacMini
- with Intel UHD Graphics 630, and Radeon RX580 w/8GB Video RAM eGPU - running macOS Big Sur 11.0.1