[Bug 1992178] Comment bridged from LTC Bugzilla

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------- Comment From bergner at us.ibm.com 2023-08-23 15:16 EDT-------
(In reply to comment #8)
> Hi, did any PPC expert have a chance to look at this issue? We keep seeing
> it when running systemd ppc64 tests in qemu on Ubuntu jammy (both host and
> guest, same version)

I commented in the upstream github issue.  What I said is that it
doesn't seem like a compiler issue to me, since the problem only seems
to be exposed when running inside autopkgtest and not when running
outside of autopkgtest, even when using the same compiler options.  It
seems more the memory corruption to me given the random failure
locations and memory corruption can be caused by just about anything.

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https://bugs.launchpad.net/bugs/1992178

Title:
  autopkgtest: upstream tests that run in qemu hang on ppc64el

Status in systemd:
  Unknown
Status in The Ubuntu-power-systems project:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Jammy:
  New

Bug description:
  I believe this started early in the kinetic cycle, cf.
  https://autopkgtest.ubuntu.com/packages/systemd/kinetic/ppc64el vs
  https://autopkgtest.ubuntu.com/packages/systemd/jammy/ppc64el.
  Timeouts in the upstream tests have been an issue for a while, but
  kinetic on ppc64el consistently times out with upstream tests that run
  in QEMU.

  Skipping individual tests does not help, because *which* tests time
  out appears to change with each build. For example, in 251.4-1ubuntu4
  the TEST-36-NUMAPOLICY test was consistently the culprit, but now in
  251.4-1ubuntu6 the TEST-14-MACHINE-ID often times out.

  I have not been able to identify a root cause for this, but it seems
  that running tests in QEMU is very fragile on ppc64el, where as the
  tests that run in nspawn are more consistent.

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