Mac Pro 6,1 restarts after being on for 1 day or less.

That error report is damaged and unreadable, and only the device tree is shown instead.

Kernel Panic Reports are stored at:

/Library/Logs/DiagnosticReports

If you copy and paste that string into:

Finder > Go menu > Go to Folder

it will take you to where those reports are stored.

They are named with Date&Time and start or end in ‘panic’

If you find one, please post the entire report here, by using the “additional text” Icon in the reply footer (looks like a paper with writing).

Please don’t post more about 20 lines of any other types of reports — they are interminable, and any information useful for this purpose is on the first screenful.

There are three quick take-aways from any panic report.

1) The panic-reason,

2) the extensions present at the "scene of the crime", and

3) the BSD process in which the problem occurred.

One more item that is important is the names of any third-party Extensions you have added. They are shown FIRST in the extensions loaded section

Turn off Spotlight. The issue is that spotlight keeps reindexing over and over, in return your CPU is overloaded resulting in a safety shutdown. This happened to me several times, I read my own crash report and figured it out.