[Bug 2048388] [NEW] Test suite often fails with "systemd units changed without reload" on s390x

[Olivier Gayot]

Public bug reported:

The "ethernets" autopkgtest for netplan.io 0.107-5ubuntu2 on s390x often
fails with

AssertionError: systemd units changed without reload

Looking at the history of autopkgtest runs, it looks like that the error
does not always occur during execution of a specific test. I've seen
occurrences of this error during the following test-cases:

test_dhcp6 (__main__.TestNetworkd.test_dhcp6) ... FAIL
test_link_local_ipv4 (__main__.TestNetworkd.test_link_local_ipv4) ... FAIL
test_eth_mtu (__main__.TestNetworkd.test_eth_mtu) ... FAIL

Example [1]:

781s FAIL: test_dhcp6 (__main__.TestNetworkd.test_dhcp6)
781s ----------------------------------------------------------------------
781s Traceback (most recent call last):
781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/ethernets.py", line 189, in test_dhcp6
781s     self.generate_and_settle([self.state_dhcp6(self.dev_e_client)])
781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/base.py", line 342, in generate_and_settle
781s     self.fail('systemd units changed without reload')
781s AssertionError: systemd units changed without reload

[1] https://autopkgtest.ubuntu.com/results/autopkgtest-
noble/noble/s390x/n/netplan.io/20240105_144627_cb35e@/log.gz

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  The "ethernets" autopkgtest for netplan.io 0.107-5ubuntu2 on s390x often
  fails with
  
  AssertionError: systemd units changed without reload
  
  Looking at the history of autopkgtest runs, it looks like that the error
  does not always occur during execution of a specific test. I've seen
  occurrences of this error during the following test-cases:
  
  test_dhcp6 (__main__.TestNetworkd.test_dhcp6) ... FAIL
  test_link_local_ipv4 (__main__.TestNetworkd.test_link_local_ipv4) ... FAIL
  test_eth_mtu (__main__.TestNetworkd.test_eth_mtu) ... FAIL
  
- Example:
+ Example [1]:
  
  781s FAIL: test_dhcp6 (__main__.TestNetworkd.test_dhcp6)
  781s ----------------------------------------------------------------------
  781s Traceback (most recent call last):
  781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/ethernets.py", line 189, in test_dhcp6
  781s     self.generate_and_settle([self.state_dhcp6(self.dev_e_client)])
  781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/base.py", line 342, in generate_and_settle
  781s     self.fail('systemd units changed without reload')
  781s AssertionError: systemd units changed without reload
+ 
+ [1] https://autopkgtest.ubuntu.com/results/autopkgtest-
+ noble/noble/s390x/n/netplan.io/20240105_144627_cb35e@/log.gz

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https://bugs.launchpad.net/bugs/2048388

Title:
  Test suite often fails with "systemd units changed without reload" on
  s390x

Status in netplan.io package in Ubuntu:
  New

Bug description:
  The "ethernets" autopkgtest for netplan.io 0.107-5ubuntu2 on s390x
  often fails with

  AssertionError: systemd units changed without reload

  Looking at the history of autopkgtest runs, it looks like that the
  error does not always occur during execution of a specific test. I've
  seen occurrences of this error during the following test-cases:

  test_dhcp6 (__main__.TestNetworkd.test_dhcp6) ... FAIL
  test_link_local_ipv4 (__main__.TestNetworkd.test_link_local_ipv4) ... FAIL
  test_eth_mtu (__main__.TestNetworkd.test_eth_mtu) ... FAIL

  Example [1]:

  781s FAIL: test_dhcp6 (__main__.TestNetworkd.test_dhcp6)
  781s ----------------------------------------------------------------------
  781s Traceback (most recent call last):
  781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/ethernets.py", line 189, in test_dhcp6
  781s     self.generate_and_settle([self.state_dhcp6(self.dev_e_client)])
  781s   File "/tmp/autopkgtest.G0qQU0/build.Snp/src/tests/integration/base.py", line 342, in generate_and_settle
  781s     self.fail('systemd units changed without reload')
  781s AssertionError: systemd units changed without reload

  [1] https://autopkgtest.ubuntu.com/results/autopkgtest-
  noble/noble/s390x/n/netplan.io/20240105_144627_cb35e@/log.gz

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