My MacBook Pro running Catalina has been crashing when:
- attached to an external monitor (an LG UltraFine 5K Display),
- in clamshell mode, and
- it goes to sleep
This looks like a known bug according to forum posts like this and this.
My workaround for now has been:
- manually put the computer to sleep when I step away or
- not use the monitor or
- when running a long-running process and I want to step away, running
caffeinate
in a shell to prevent idle sleep:
caffeinate -u -d
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