[Bug 1935617] Re: systemd autopkgtest broken on ppc64el with qemu 6.0

[Christian Ehrhardt ]

Hmm, I can blindly read through the qemu commit log and try rebuilds or even a bisect at some point. But maybe this is already known. Since I'm soon on EOD I wonder if we could mirror this to IBM (now that we know a bit more) if this is a known issue to point us at an existing discussion or fix.
@Frank could you have a look at doing so?

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https://bugs.launchpad.net/bugs/1935617

Title:
  systemd autopkgtest broken on ppc64el with qemu 6.0

Status in qemu package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  I'm not sure yet if this is flaky or a real issue, but I'm filing it
  to avoid multiple people analyzing the same.

  The Qemu 6.0 upload https://launchpad.net/ubuntu/+source/qemu/1:6.0+dfsg-1~ubuntu2 triggers a test failure like
  https://autopkgtest.ubuntu.com/results/autopkgtest-impish/impish/ppc64el/s/systemd/20210708_223311_e3bbb@/log.gz

  I have tested the new qemu on ppc64 and it worked fine for device emulation and migration cases.
  But this is suspicious.
  Of the last tests exactly and only those with the new qemu failed.

  
  impish
    ppc64el
      tests-in-lxd                   (F  5% f  0% S  0% B  0% => P 95%/) F.........F.............................
      systemd-fsckd                  (F  0% f  0% S 100% B  0% => P  0%/) SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
      upstream-1                     (F 15% f  0% S  0% B  0% => P 85%/) F..FFFF....F............................
      upstream-2                     (F 12% f  0% S  0% B  0% => P 87%/) F..FFFF.................................

  
  For an insight in flakyness/reproducibility I've retriggered the missing qemu and the non-qemu cases a few times. If those reproduce all-bad vs all-good again this would further indicate a real issue.

  Unfortunately the ppc maas seems down right now and canonistack also
  isn't too nice this week - overall that inhibits the testing a bit :-/

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