Thanks for the Report!
That is:

commit 23fff7a17f47420797ac6480147941612152a9ad
Author: Andreas Krebbel <[email protected]>
Date:   Wed Mar 24 19:51:28 2021 +0100

    linux-user/s390x: Use the guest pointer for the sigreturn stub
    
    When setting up the pointer for the sigreturn stub in the return
    address register (r14) we currently use the host frame address instead
    of the guest frame address.
    
    Note: This only caused problems if Qemu has been built with
    --disable-pie (as it is in distros nowadays). Otherwise guest_base
    defaults to 0 hiding the actual problem.
    
    Signed-off-by: Andreas Krebbel <[email protected]>
    Reviewed-by: Laurent Vivier <[email protected]>
    Reviewed-by: Richard Henderson <[email protected]>
    Message-Id: <[email protected]>
    Signed-off-by: Laurent Vivier <[email protected]>


$ git tag --contains 23fff7a17f47420797ac6480147941612152a9ad
v6.0.0-rc1

There are currently a bunch of qemu SRUs in flight which have to "clear the 
queue" first.
If until then you found that it also affects Focal we can fix that as well - 
let us know in this case.

** Also affects: qemu (Ubuntu Groovy)
   Importance: Undecided
       Status: New

** Also affects: qemu (Ubuntu Hirsute)
   Importance: Undecided
     Assignee: Canonical Server Team (canonical-server)
       Status: New

** Also affects: qemu (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: qemu (Ubuntu Hirsute)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Groovy)
       Status: New => Triaged

** Changed in: qemu (Ubuntu Focal)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1922010

Title:
  [Ubuntu 21.04] IBM Z go binary crashes under Qemu

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