------- Comment From niklas.schne...@ibm.com 2020-09-01 04:30 EDT-------
Ok I've tested the proposed kernel and also looked at the sources in the focal 
Kernel repository. Sadly it looks like we missed adding the following upstream 
commit.

b76fee1bc56c31a9d2a49592810eba30cc06d61a s390/pci: ignore stale
configuration request event

I mentioned this commit in my original request but erroneously stated
that it was part of Bug 1891437. Sadly that is not correct as while that
commit fixes a related issue it actually came a bit later. Would it be
possible to still add it as part of this Bug or should I create a new
one?

The problem description in this bug is actually fixed without that commit, and 
I verified this with the 5.4.0-46-generic kernel from proposed. The same is 
true for the problem described in 1891437 but it's closely related to both of 
them and I actually didn't expect the commits to even apply without it.
As with the others the missed commit is also CC stable of course.

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Title:
  [UBUNTU 20.04] zPCI attach/detach issues with PF/VF linking support

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