[Bug 1993633] Re: Installation crash if 'custom 'is selected in guided storage screen and having a LUN with a previous installation on it

[Frank Heimes]

This is solved (afaict with a workaround) in 23.10.

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Title:
  Installation crash if 'custom 'is selected in guided storage screen
  and having a LUN with a previous installation on it

Status in subiquity:
  New
Status in Ubuntu on IBM z Systems:
  New

Bug description:
  While doing an interactive installation with the latest kinetic ISO image (on s390x, but I think it's not limited to this architecture) using a SCSI LUN as disk storage that has a previous installation on it, I'm facing the following crash, in case I select 'Custom storage layout' at the 
  'Guided storage configuration' screen.

  The remote ssh installation session drops with the following output:

  generating crash report
  report saved to /var/crash/1666201519.789847612.ui.crash
  Traceback (most recent call last):
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/client/controllers/filesystem.py", line 258, in _guided_choice
      self.ui.set_body(FilesystemView(self.model, self))
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 476, in __init__
      self.refresh_model_inputs()
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 522, in refresh_model_inputs
      self.avail_list.refresh_model_inputs()
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 410, in refresh_model_inputs
      for obj, cells in summarize_device(device, filter):
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/ui/views/filesystem/helpers.py", line 34, in summarize_device
      anns = labels.annotations(device) + labels.usage_labels(device)
    File "/snap/subiquity/4005/usr/lib/python3.8/functools.py", line 875, in wrapper
      return dispatch(args[0].__class__)(*args, **kw)
    File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/common/filesystem/labels.py", line 96, in _annotations_vg
      member = next(iter(vg.devices))
  StopIteration

   The above exception was the direct cause of the following exception:
   
   Traceback (most recent call last):
     File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquity/client/client.py", line 407, in run
       super().run()
     File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquitycore/tui.py", line 381, in run
       super().run()
     File "/snap/subiquity/4005/lib/python3.8/site-packages/subiquitycore/core.py", line 135, in run
       raise exc
   RuntimeError: coroutine raised StopIteration

  also:

   2022-10-19 17:45:19,787 DEBUG subiquity.models.filesystem:1271 exclusions set()
   2022-10-19 17:45:19,789 DEBUG subiquity.common.errorreport:384 generating crash report
   2022-10-19 17:45:19,794 INFO subiquity.common.errorreport:406 saving crash report 'Installer UI crashed with RuntimeError' to /var/crash/1666201519.789847612.ui.crash
   2022-10-19 17:45:19,794 INFO subiquity/ErrorReporter/1666201519.789847612.ui/add_info:107 start:
  InstallerLogInfo:

  The full /var/log and /var/crash content from two different system are
  attached.

  This is a spin-off from bug LP#1993257.

  After an initial chat with dbungert, it's believed that wipefs doesn't
  do a proper job and leaves other components in unspecific states.

  
  Reconnecting to the installer and trying to 'Continue' does not work.
  But manually wiping the disks on the LUN with for example:
  wipefs -a -f /dev/sda1
  wipefs -a -f /dev/sda2
  wipefs -a -f /dev/sda
  AND then restarting the installation from scratch works
  and will finally show an empty disk at the 'Custom storage layout'.

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