[Bug 2118799] Re: installer crashes trying to install Ubuntu 25.10 with an FCP disk on s390x

[Frank Heimes]

So Patricia used an LPAR (with zFCP/SCSI/multipath) and I tested today on a z/VM guest (again with zFCP/SCSI/multipath).
I was not able to install questing at all due to a network issue - need to investigate more on this - but this is not related to this bug.

Then tried to install the (same) z/VM guest (using zFCP/SCSI/multipath) with plucky and it worked fine.
So the issue that is reported here seems to be a regression, since it works on 25.04.

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Title:
  installer crashes trying to install Ubuntu 25.10 with an FCP disk on
  s390x

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

Bug description:
  Installer crashes when I'm trying to install Ubuntu 25.10  Questing
  Quokka on a s390x LPAR, with an FCP disk

  
  Running command ['udevadm', 'info', '--query=property', '--export', '/dev/dm-0'] with allowed return codes [0] (capture=True)
   partition_kname=22-part1
   An error occured handling 'partition-1': OSError - devname '22-part1' did not have existing syspath '/sys/class/block/22-part1'
   finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: configuring partition: partition-1
   TIMED BLOCK_META: 8.253
   finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta
   Traceback (most recent call last):                                                                                                                                                                                                           
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/commands/main.py", line 202, in main
       ret = args.func(args)
             ^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/log.py", line 97, in wrapper
       return log_time("TIMED %s: " % msg, func, *args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/log.py", line 79, in log_time
       return func(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/commands/block_meta.py", line 128, in block_meta
       return meta_custom(args)
              ^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/commands/block_meta.py", line 2292, in meta_custom
       handler(command, storage_config_dict, context)
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/commands/block_meta.py", line 1060, in partition_handler
       calc_partition_info(partition_kname, logical_block_size_bytes))
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/commands/block_meta.py", line 897, in calc_partition_info
       pdir = block.sys_block_path(partition_kname)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/snap/subiquity/6801/lib/python3.12/site-packages/curtin/block/__init__.py", line 176, in sys_block_path
       raise err
   OSError: devname '22-part1' did not have existing syspath '/sys/class/block/22-part1'
   devname '22-part1' did not have existing syspath '/sys/class/block/22-part1'
   curtin: Installation failed with exception: Unexpected error while running command.
   Command: ['curtin', 'block-meta', 'simple']
   Exit code: 3

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