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

[Frank Heimes]

Then I retried a plucky installation (on LPAR using zFCP/SCSI/multipath) again on the exact same system that was initially used and it completed fine.
I saved the logs again an attach them here... (for the reason of potential comparison)

This was on the same system, same configuration and condition, just the
plucky ISO instead of questing.

** Attachment added: "s1lp15_plucky_01082025.tgz"
   https://bugs.launchpad.net/ubuntu-z-systems/+bug/2118799/+attachment/5895813/+files/s1lp15_plucky_01082025.tgz

** Changed in: subiquity
       Status: Incomplete => New

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

Status in subiquity:
  New
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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