ExtremeTech: CPU Manufacturers Are Pushing the Boundaries of CMOS and Starting to Pay For It

[jim bell]

When I worked for Intel in 1980, they were working on a CPU called the IAPX 432, which as I recall had the intended feature that they were installed in pairs, one called a "generator" and the other called a "checker".
https://en.wikipedia.org/wiki/Intel_iAPX_432?wprov=sfla1

The latter verified that the "generator" had done its job correctly.   
 
  On Mon, Jun 7, 2021 at 6:01 PM, Karl<gmkarl at gmail.com> wrote:   Summary:
Google is collecting evidence indicating that at least around 3% of modern cups are silently corrupting data in ways that users don't notice.


A pathological cpu core is described that performs AES in some way such that it can reliably decrypt its own encrypted documents, but no other discovered cores can do so.
The failures are called "corrupt execution errors" and the invisibly failing cores "mercurial" .  Blamed on problems of miniaturization.  Chip manufacturers have not spoken yet.  Google is finding more problems as they improve their software for detecting them.
Google's paper linked from the article appears to be https://sigops.org/s/conferences/hotos/2021/papers/hotos21-s01-hochschild.pdf .  I have not visited the link myself.  
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