The blanket ban was kicked off by another incident after the hypocrite commit incident.

1. Prof and students make fake identities

2. They submit these secret vulns to Greg KH and friends

3. Some of these patches are accepted

4. They intervene at this point and reveal that the patches are malicious

5. The patches are then not merged

6. This news comes out and Greg KH applies big negative trust score to umn.edu

7. Some other student submits a buggy patch to Greg KH

8. Greg KH assumes that it is more research like this

9. Student calls it slander

10. Greg KH institutes policy for his tree that all umn.edu patches should be auto-rejected and begins reverts for all patches submitted in the past by such emails

To be honest, I can't imagine any other such outcome could have occurred. No one likes being cheated out of work that they did, especially when a lot of it is volunteer work. But I was wrong to say the research was useless. It does demonstrate that identities without provenance can get malicious code into the kernel.

Perhaps what we really need is a Social Credit Score for OSS ;)