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

[Christian Ehrhardt ]

Still the systemd tests are very flaky.
I went through some re-runs and these last 7 tests all did test the very same packages.

impish
  amd64
    boot-and-services              (F 14% f  0% S  0% B  0% => P 85%/) ...F...
    systemd-fsckd                  (F  0% f  0% S 100% B  0% => P  0%/) SSSSSSS
    upstream-1                     (F 42% f  0% S  0% B  0% => P 57%/) ....FFF
    upstream-2                     (F 14% f  0% S  0% B  0% => P 85%/) ....F..

We see that the last three all were happy.
But formerly without any reason other than being flaky one (upstream-1) or the other (upstream-2) or another (boot-and-services) failed.
If only we could re-trigger subtests only that would be much less wasted test-time :-/

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Title:
  systemd autopkgtest broken on ppc64el with qemu 6.0

Status in The Ubuntu-power-systems project:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Invalid

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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