I just wanted to try the kernel that I've build yesterday (see comment #6) and 
as a first step I wanted to recreate re-create the described error situation on 
an up to date 20.04 system:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04 LTS
Release:        20.04
Codename:       focal
$ uname -a
Linux zlin42 5.4.0-40-generic #44-Ubuntu SMP Mon Jun 22 23:57:33 UTC 2020 s390x 
s390x s390x GNU/Linux
$ apt-cache policy linux-generic
linux-generic:
  Installed: 5.4.0.40.43
  Candidate: 5.4.0.40.43
  Version table:
 *** 5.4.0.40.43 500
        500 http://ports.ubuntu.com/ubuntu-ports focal-updates/main s390x 
Packages
        500 http://ports.ubuntu.com/ubuntu-ports focal-security/main s390x 
Packages
        100 /var/lib/dpkg/status
     5.4.0.26.32 500
        500 http://ports.ubuntu.com/ubuntu-ports focal/main s390x Packages
$

But by surprise I didn't ran into any problems!

I was able to flawlessly make use of FBA devices in the following three 
different way:
1) (re-)used a FBA device that was previously in use, without wiping out any 
data
2) used a FBA device that I wiped out using wipefs
3) used a FBA device that I entirely wiped out (and zeroed) using dd
(see the attached doc for more details)

Looks like a fix for this problem came in with the kernels that were rolled out 
in between  5.4.0-29-generic and 5.4.0-40-generic.
(Again I didn't installed the patched kernel, I just used the latest official 
one.)

Message to the initial bug reporter:
Please can you retry on an up-to-date 20.04 system (or after having updated 
your existing one, like for example with "sudo apt -y -q update && sudo apt -y 
-q full-upgrade" plus reboot in case the kernel got update, what I assume will 
happen)?

** Attachment added: "cmdline.txt"
   
https://bugs.launchpad.net/ubuntu-z-systems/+bug/1879707/+attachment/5394964/+files/cmdline.txt

** Changed in: ubuntu-z-systems
       Status: In Progress => Incomplete

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https://bugs.launchpad.net/bugs/1879707

Title:
  [UBUNTU 20.04] mke2fs dasd(fba),Failing CCW,default ERP has run out of
  retries and failed

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