Mac Pro Late 2013 Unexpectedly Crashes

hi

1. first try updating to 10.15.3 (may just be some sort or bug)
2. reset the nvram and SMC

Reset NVRAM or PRAM on your Mac - Apple Support

How to reset the SMC of your Mac - Apple Support

If none of that works run apple diagnostics

How to use Apple Diagnostics on your Mac - Apple Support

Keep us posted on if this stuff fixes your problem.

Joe

Not a good sign...

Virtual Memory Information:

Physical RAM: 16 GB

Free RAM: 20 MB

Besides that all I can find is this, seems to be due to some peripheral, even a Monitor or KB...

https://discussions.apple.com/thread/250715149

https://www.reddit.com/r/MacOS/comments/evoskk/catalina_10153_crash_reboot/

Please download and run Etrecheck.

https://etrecheck.com/

It is a diagnostic tool that's very useful to us in finding problems. Also it will give us further specs on your Mac. After it runs post the log file here. It will contain no personal information. Allowing full drive access will improve the quality of the report.

To post the log file click on share report and use the Additional Text icon in your reply window.

That crash reports suggests a graphics card problem. Windowserver sent the graphics subsystem some work to do, and then never heard back that it had completed. A watchdog timer (set to catch such problems) fired to indicate it had not heard back in 120 seconds.

Your Etrecheck report is complaining about excessive Network use as well.

[Running] com.backblaze.bzserv.plist (Backblaze - installed 2019-09-16)

"On the cloud" is great for sharing photos, but is not a viable backup solution for everything you have. The stuff is not under your control, and is subject to sloppy handling, arbitrary changes in policy, theft, data loss, and bankruptcy of the company that holds it. It can easily take three days to restore it at ordinary Internet speeds.

If you do not have a recent backup, your computer is like a ticking Time bomb. You are only one disk failure away from losing EVERYTHING! Drives do not last forever. It is not a question of IF it will fail, only WHEN it will fail.

If you are using another direct-to-disk backup method that you prefer, and you currently have a recent backup, that is great. If not, you should consider using Built-in Time Machine. 

Swap Used 3.04GB says that at some points since startup, you were so short of real RAM you needed to simulate some (and not a small amount) on the boot drive.

Your RAM Is expandable. If you are not changing your habits, consider adding more RAM.

Backblaze is a drag because it is not a Mac Application. The only way it can be sure that files are not getting out of date is to read them, incessantly, punishing your Mac's performance.

Time Machine does not drag your system down because it does not read your files non-stop. Time Machine use a Mac data structure, the File System Event Store, to know quickly what needs to be backed up.

<<I have the latest crash report, if that helps. >>

sometimes yes, sometimes no, But if you have it, post it.