The problem showing in that report is Machine Check, a serious hardware problem.
it was reported by all four processors, suggesting an issue in Hardware common with all four processors such as shared processor cache hardware.
Unfortunately, Genius Bar technicians and Apple-Authorized Service Providers are not trained to read panic reports, so if your Mac passes the diagnostic while they are testing it, they have no recourse but to return it to you, unchanged.
That Mac is getting so old, there may be no new parts available to swap the mainboard that holds the processor. Your alternative is to find a used mainboard, and a repair person who can swap for you.
What part of the world?