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

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== 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!

** Affects: ubuntu-power-systems
     Importance: Undecided
         Status: New

** Affects: subiquity (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-216529 severity-high targetmilestone-inin2604
-- 
Ubuntu25.10: Ubuntu host installation is failing while doing  installation on multiple[2 or more] multipath SAN disks!
https://bugs.launchpad.net/bugs/2133480
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