The delta between 5.4.0.107.121 and 5.4.0.90.101 are about 2000 commits
and more than 20 are NFS related and also some about vfs.

------- Comment From stefan.am...@de.ibm.com 2022-04-07 09:14 EDT-------
thanks for starting to look into this issue!

We have a large number of LPARs running client workload. This issue happens 
occasionally - each time impacting client SLAs and causing several hours to 
re-install LPARs and integrating them in our cloud environment. We need to 
understand the root cause of the issue.
While we will update our systems any time soon, we cannot afford waiting for 
the updates to happen to see if the issue disappears. So I hope we can identify 
the root cause! If it is fixed already - the better :-)

Regarding the kdump: I'm currently clarifying if we can send the kdump. Since 
it is from a production machine. And I want to ensure we are GDPR compliant. Do 
you happen to know, if there is a GDPR compliant process established on your 
side?
As far as I know, a box folder is not an option. But the ftp transfer may be.

Or would it be possible for you to specify the commands to run? We could
then ensure the data is clean and send it over

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https://bugs.launchpad.net/bugs/1968096

Title:
  [UBUNTU 20.04] Null Pointer issue in nfs code running Ubuntu on IBM Z

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