Traceback in autopkgtest-virt-lxd

[Brian Murray]

When investigating a failed lxd-armhf worker unit I noticed the following in its log file:

                                                                                                           autopkgtest [01:47:47]: test test-systemd.py: [-----------------------
                                                                                                           Killed
                                                                                                           autopkgtest [01:47:55]: test process requested preparation for reboot with marker InstallOnShutdown
                                                                                                           autopkgtest-virt-lxd [01:48:00]: state saved, waiting for testbed to reboot...
                                                                                                           Unexpected error:
                                                                                                           Traceback (most recent call last):
                                                                                                             File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 740, in mainloop
                                                                                                               command()
                                                                                                             File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 669, in command
                                                                                                               r = f(c, ce)
                                                                                                             File "/home/ubuntu/autopkgtest/lib/VirtSubproc.py", line 364, in cmd_reboot
                                                                                                               caller.hook_wait_reboot(**wait_reboot_args)
                                                                                                             File "/home/ubuntu/autopkgtest/virt/autopkgtest-virt-lxd", line 229, in hook_wait_reboot
                                                                                                               if current_uptime < initial_uptime:
                                                                                                           TypeError: '<' not supported between instances of 'float' and 'NoneType'
                                                                                                           autopkgtest [01:48:14]: ERROR: testbed failure: cannot send to testbed: [Errno 32] Broken pipe

[Brian Murray (brian-murray)]

The test being run was "Received request for package unattended-upgrades on kinetic/armhf; params: {'triggers': ['lsb-release-minimal/0.5-1'], 'submit-time': '2022-08-10 00:47:06'}" and that test did end up passing later - https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/armhf/u/unattended-upgrades/20220810_021012_94612@/log.gz

[Paride Legovini (paride)]

By looking at the code this can happen if running

  lxc exec container_name -- cat /proc/uptime

fails (returns nonzero). If autopkgtest-virt-lxd believes the container is up but that command fails I think it's fair to bail out, but it should be done more gracefully (not with a Traceback).