[Bug 2133480] Re: Ubuntu25.10: Ubuntu host installation is failing while doing installation on multiple[2 or more] multipath SAN disks!

[Frank Heimes]

** Package changed: debian-installer (Ubuntu) => subiquity (Ubuntu)

** Changed in: ubuntu-power-systems
     Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)

** Changed in: subiquity (Ubuntu)
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => (unassigned)

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https://bugs.launchpad.net/bugs/2133480

Title:
  Ubuntu25.10: Ubuntu host installation is failing while doing
  installation on multiple[2 or more] multipath SAN disks!

Status in The Ubuntu-power-systems project:
  New
Status in subiquity package in Ubuntu:
  New

Bug description:
  == Comment: #0 - Anushree Mathur <Anushree.Mathur2 at ibm.com> - 2025-11-28 03:12:11 ==
  ENV :
  HOST OS : Ubuntu 25.10 

  Host installation is crashing with following crash when we do
  installation on multiple[2 or more] SAN disks and we see -EBUSY error
  with specific mpath disk.

  generating crash report
  report saved to /var/crash/1760429899.735880613.ui.crash
  Traceback (most recent call last):
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/client/controllers/filesystem.py", line 296, in _guided_choice
      self.ui.set_body(FilesystemView(self.model, self))
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 485, in __init__
      self.refresh_model_inputs()
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 544, in refresh_model_inputs
      self.used_list.refresh_model_inputs()
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/ui/views/filesystem/filesystem.py", line 417, in refresh_model_inputs
      for obj, cells in summarize_device(device, filter):
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/ui/views/filesystem/helpers.py", line 32, in summarize_device
      anns = labels.annotations(device) + labels.usage_labels(device)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/usr/lib/python3.12/functools.py", line 909, in wrapper
      return dispatch(args[0].__class__)(*args, **kw)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/common/filesystem/labels.py", line 101, 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/6868/usr/bin/subiquity", line 8, in <module>
      sys.exit(main())
               ^^^^^^
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/cmd/tui.py", line 161, in main
      asyncio.run(run_with_loop())
    File "/snap/subiquity/6868/usr/lib/python3.12/asyncio/runners.py", line 194, in run
      return runner.run(main)
             ^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/usr/lib/python3.12/asyncio/runners.py", line 118, in run
      return self._loop.run_until_complete(task)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/usr/lib/python3.12/asyncio/base_events.py", line 687, in run_until_complete
      return future.result()
             ^^^^^^^^^^^^^^^
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/cmd/tui.py", line 159, in run_with_loop
      await subiquity_interface.run()
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/client/client.py", line 426, in run
      await super().run()
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquitycore/tui.py", line 390, in run
      await super().run()
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquitycore/core.py", line 133, in run
      raise exc
    File "/snap/subiquity/6868/lib/python3.12/site-packages/subiquity/client/controllers/filesystem.py", line 300, in show_guided_and_redraw
      await self._guided_choice(choice)
  RuntimeError: coroutine raised StopIteration
                                                                                                            ^[[29;1R^[[29;106R
  Ubuntu Questing Quokka (development branch) ubuntu-server hvc

  
  Explaining whole scenario:

  When I tried to install my P11 lpar with Ubuntu with SAN disk
  1) 4 SAN disks are there
  2) I installed on mpatha (installation worked fine)
  3) I installed on mpathb (installation worked fine)
  4) When i rebooted the system connected to the console and then I tried to reinstall the system it gave the error message [-EBUSY] and then installation crashed

  My analysis:

  In the background, after each boot I was entering the shell and was checking for the multipath status:
  1) In the first attempt when i checked it gave all four disks
  2) After mpatha installation also all disks were listed in multipath -ll
  3) After mpathb installation also all disks were there
  4) When I tried the reinstallation after this I saw that multipath service itself gave the error as :

  [2168]: updated bindings file /etc/multipath/bindings
  [2168]: mpathb: addmap [0 230686720 multipath 1 queue_if_no_path 1 alua 2 1 ser>
  [2168]: libdevmapper: ioctl/libdm-iface.c(1995): device-mapper: reload ioctl on>
  [2168]: dm_addmap: libdm task=0 error: Device or resource busy
  [2168]: mpathb: ignoring map
  [2168]: mpathb: addmap [0 230686720 multipath 1 queue_if_no_path 1 alua 2 1 ser>
  [2168]: libdevmapper: ioctl/libdm-iface.c(1995): device-mapper: reload ioctl on>
  [2168]: dm_addmap: libdm task=0 error: Device or resource busy
  [2168]: mpathb: ignoring map
  : Started multipathd.service - Device-Mapper Multipath Device Controller.

  5) With multipath -ll I was not able to see mpathb there
  6) multipath service is not failing to restart but it is throwing this error message because mapping is not happening properly!
  I feel because of some stale metadata present on the mapathb at the time of installation which shouldn't have been there, it has happened.

  
  I tried this exact same scenario even on my P10 lpar which had 2 disks and I observed same kind of behavior! 

  Reproducibility with this exact scenario is 95%. 
  Reference bug is https://bugzilla.linux.ibm.com/show_bug.cgi?id=208604 but now the scenario has been changed!

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