Mac Pro 2019 Kernel Panic - Can anyone see any clues? TIA!

I agree with IdrisSeabright, once is no big deal. If you occurs frequently the next step would be to post the free EtreCheck report to identify any software conflicts. The report contains no personal information and provides much more detail about processes that you have on your computer and other diagnostic logs that may be related.

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there is not enough information in that one crash report for an accurate diagnosis.

Consider downloading and running this little "discovery" utility, Etrecheck. It changes NOTHING. Etrecheck was developed by senior contributor here, and uses system calls to collect often-needed information.

it contains little tests for speeds of devices, CPU utilization, memory usage, energy usage and a digest of recent problems, in one easy to use package. it does not even need to be Installed. Because less can be learned when your Mac is running great, best time to run is when your problems are actually occurring, if possible.

if you follow the directions faithfully, its report (pre-laundered of all personally-identifiable information) can be "Shared" to the System ClipBoard, then Pasted into an ‘Additional Text’ window in a reply on the forums.

Use Etrecheck Pro for free:

http://Etrecheck.com

then start a reply on the forums, active the Additional text icon and PASTE the clipboard in to the extra-large window:

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A “spinlock” is a feature that protects against 2 resources conflicting with each other. One resource creates a lock to protect data the app is updating. A 2nd resource wants to access that resource, so it keeps trying over and over testing the lock, and when it has tried a number of times it gives up and cancels the request. If it was a critical MacOS resource that it needed it forces a crash (Panic) of MacOS to generate a diagnostic file for Apple engineers to analyze. If it was a non-critical system task it just force crashes the app.

To tell the difference, did the whole Mac crash, or just the app?

How many times has this happened? If it only happened once, I would do absolutely nothing. Glitches happen. Reinstalling macOS would, in my opinion, be overkill.

If it's happening regularly, that's another matter.

Your signature says macOS 12.3. I believe you are at macOS 15.1.1 or higher. You might want to correct this, since the macOS version has important implications for kernel panics.

Considering the history of bugs in macOS, updating to maOS 15.1 or higher is probably the first advice that should have been given. Being clear that you have already done so may help in the ongoing process of debugging macOS.

I agree with Idris—reinstalling the OS should be the last resort, not the first action. If you have a hardware issue, no amount of reinstalling can help.

I was running a zoom call and downloading some sample content at the time so nothing really that strenuous.

I respectfully disagree. Zoom is heavy-duty use. I have temp monitoring software on my Macs; both my iMac 5K and Macbook Pro show high heat increases with only a Zoom call open. CPU temps jump from "normal"—38 to 40C—to over 70C in minutes.

If you do a web search for spinlock acquisition timeout, you will see a number of hits. Several suggest a GPU hardware issue. Others suggest a conflict with a Cisco VPN component.

If this is a networked company computer, please consult your IT people.

It looks as though Safari may have a problem.

I suggest you reinstall macOS (or just Safari if you are able to).