lxc-test-usernsexec in ubuntu_lxc failed on F/H/I s390x LPAR

[Po-Hsu Lin]

Issue found on s390x LPAR node s2lp4 with Focal / Hirsute

 Running '/tmp/lxc-pkg-ubuntu/src/tests/lxc-test-usernsexec'
 [stderr] as test-userns executing /tmp/lxc-pkg-ubuntu/src/tests/lxc-test-usernsexec
 [stderr] sudo: unknown user: test-userns
 [stderr] sudo: error initializing audit plugin sudoers_audit
 Exception escaping from test:
Traceback (most recent call last):
  File "/home/ubuntu/autotest/client/shared/test.py", line 411, in _exec
    _call_test_function(self.execute, *p_args, **p_dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 823, in _call_test_function
    return func(*args, **dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 291, in execute
    postprocess_profiled_run, args, dargs)
  File "/home/ubuntu/autotest/client/shared/test.py", line 212, in _call_run_once
    self.run_once(*args, **dargs)
  File "/home/ubuntu/autotest/client/tests/ubuntu_lxc/ubuntu_lxc.py", line 104, in run_once
    utils.system_output(cmd, retain_output=True)
  File "/home/ubuntu/autotest/client/shared/utils.py", line 1267, in system_output
    verbose=verbose, args=args).stdout
  File "/home/ubuntu/autotest/client/shared/utils.py", line 918, in run
    "Command returned non-zero exit status")
CmdError: Command </tmp/lxc-pkg-ubuntu/src/tests/lxc-test-usernsexec> failed, rc=1, Command returned non-zero exit status
* Command:
    /tmp/lxc-pkg-ubuntu/src/tests/lxc-test-usernsexec
Exit status: 1
Duration: 0.0131859779358

This failure can be found before the ubuntu_lxc test granularity improvement patch (bug 1939859), so this is not caused by test case change.

In previous cycles, this issue can be found with Hirsute 5.11.0-20.21 and Focal 5.4.0-76.85 thus this is not a regression.

This issue cannot be found on amd64, so it needs to be investigated.

Note:
  There was once a failure for "ERRORS: myuidgid" in this test (bug 1900662), but it seems unrelated.

[Kleber Sacilotto de Souza (kleber-souza)]

Issue also found with impish/linux 5.13.0-30.33. This is not a regression, this testcase were failing for other reasons before and since 5.13.0-28.31 is failing like described by this bug report.