[Bug 1984669] Re: Traceback in autopkgtest-virt-lxd

[Paride Legovini]

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).

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Title:
  Traceback in autopkgtest-virt-lxd

Status in autopkgtest package in Ubuntu:
  New

Bug description:
  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

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