Public bug reported:

Ubuntu 18.04
GNOME Shell 3.28.3
Intel iGPU HD 620

Oct 18 05:16:17 user gnome-shell[1634]: g_array_unref: assertion 'array' failed
Oct 18 05:16:17 user gnome-shell[1634]: message repeated 8 times: [ 
g_array_unref: assertion 'array' failed]

Happens by chance when you right click a table after resuming from sleep
mode in the table list of MySQL Workbench.

The desktop freezes to input, mysql-workbench freezes, the rightclick
menu renders an outline but inner contents are not shown, but a terminal
for example or video will still play, wont freeze. You just wont be able
to move or click any windows or switch virtual workstations.

The only remedy is switch to another tty and kill mysql-workbench
process. Or kill gnome-shell :(.

** Affects: gdm3 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1798556

Title:
  gnome-shell lockup when using MySQL Workbench for Ubuntu 18.04

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