[Bug 1901817] Re: subiquity installation (on s390x) reusing existing partitions fails with 'Network plugin raised an exception'

[Frank Heimes]

While I was doing a custom installation I ran into this error and the
subiquity session terminated:

 get_blockdev_sector_size: (log=4096, phys=4096)
 dasda logical_block_size_bytes: 4096
 Verifying /dev/dasda1 exists
 Running command ['sfdisk', '--json', '/dev/dasda'] with allowed return codes [0] (capture=True)
 Unexpected error while running command.
 Command: ['sfdisk', '--json', '/dev/dasda']
 Exit code: 1
 Reason: -
 Stdout: ''
 Stderr: sfdisk: /dev/dasda: does not contain a recognized partition table

 Traceback (most recent call last):
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/block/__init__.py", line 297, in sfdisk_info
     (out, _err) = util.subp(['sfdisk', '--json', parent], capture=True)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/util.py", line 275, in subp
     return _subp(*args, **kwargs)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/util.py", line 141, in _subp
     cmd=args)
 curtin.util.ProcessExecutionError: Unexpected error while running command.
 Command: ['sfdisk', '--json', '/dev/dasda']
 Exit code: 1
 Reason: -
 Stdout: ''
 Stderr: sfdisk: /dev/dasda: does not contain a recognized partition table

 An error occured handling 'partition-dasda1': RuntimeError - Failed to extract sfdisk info from /dev/dasda1
 finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: configuring partition: partition-dasda1
 TIMED BLOCK_META: 2.768
 finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta
 Traceback (most recent call last):
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/commands/main.py", line 202, in main
     ret = args.func(args)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/log.py", line 97, in wrapper
     return log_time("TIMED %s: " % msg, func, *args, **kwargs)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/log.py", line 79, in log_time
     return func(*args, **kwargs)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 111, in block_meta
     return meta_custom(args)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 1916, in meta_custom
     handler(command, storage_config_dict)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 880, in partition_handler
     partition_verify(part_path, info)
   File "/snap/subiquity/2100/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 779, in partition_verify
     raise RuntimeError('Failed to extract sfdisk info from %s' % devpath)
 RuntimeError: Failed to extract sfdisk info from /dev/dasda1
 Failed to extract sfdisk info from /dev/dasda1
 curtin: Installation failed with exception: Unexpected error while running command.
 Command: ['curtin', 'block-meta', 'simple']
 Exit code: 3
 Reason: -
 Stdout: start: cmd-install/stage-partitioning/builtin/cmd-block-meta: curtin command block-meta
         get_path_to_storage_volume for volume partition-dasda1({'device': 'disk-dasda', 'size': 7385235456, 'wipe': 'superblock', 'flag': 'swap', 'number': 1, 'preserve': True, 'grub_device': False, 'type': 'partition', 'id': 'partition-dasda1'})
         get_path_to_storage_volume for volume disk-dasda({'ptable': 'vtoc', 'serial': '0X1605', 'path': '/dev/dasda', 'preserve': True, 'name': '', 'grub_device': False, 'device_id': '0.0.1605', 'type': 'disk', 'id': 'disk-dasda'})
 
Since this again points to sfdisk, I belief that it's related to this ticket.

I'm attaching entire /var/crash and /var/log and mark this as affecting
curtin, too.

** Changed in: ubuntu-z-systems
   Importance: Undecided => High

** Changed in: ubuntu-z-systems
     Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)

** Attachment added: "29102020.tgz"
   https://bugs.launchpad.net/ubuntu-z-systems/+bug/1901817/+attachment/5428895/+files/29102020.tgz

** Also affects: curtin
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1901817

Title:
  subiquity installation (on s390x) reusing existing partitions fails
  with 'Network plugin raised an exception'

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

Bug description:
  While doing a 20.10 installation and trying to re-use existing partitions:
  DASD 1:
  /boot
  swap
  DASD 2:
  root
  the ssh session of the installer broke like this:

  $ ssh installer at lpar
  installer at lpar's password: 
  Welcome to Ubuntu 20.10 (GNU/Linux 5.8.0-25-generic s390x)

   * Documentation:  https://help.ubuntu.com
   * Management:     https://landscape.canonical.com
   * Support:        https://ubuntu.com/advantage

    System information as of Wed Oct 28 07:39:05 UTC 2020

    System load:    0.21      Memory usage: 2%   Processes:       158
    Usage of /home: unknown   Swap usage:   0%   Users logged in: 0

    => There were exceptions while processing one or more plugins. See
       /var/log/landscape/sysinfo.log for more information.

  
  0 updates can be installed immediately.
  0 of these updates are security updates.

  
  Last login: Wed Oct 28 07:34:11 2020 from 10.172.194.67
  Connection to lpar closed.
  $ 

  in /var/log/landscape/sysinfo.log the following error is mentioned:
  2020-10-28 07:39:05,527 ERROR    Network plugin raised an exception.
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/landscape/sysinfo/sysinfo.py", line 99, in run
      result = plugin.run()
    File "/usr/lib/python3/dist-packages/landscape/sysinfo/network.py", line 36, in run
      device_info = self._get_device_info()
    File "/usr/lib/python3/dist-packages/landscape/lib/network.py", line 163, in get_active_device_info
      speed, duplex = get_network_interface_speed(
    File "/usr/lib/python3/dist-packages/landscape/lib/network.py", line 256, in get_network_interface_speed
      raise e
    File "/usr/lib/python3/dist-packages/landscape/lib/network.py", line 248, in get_network_interface_speed
      fcntl.ioctl(sock, SIOCETHTOOL, packed)  # Status ioctl() call
  InterruptedError: [Errno 4] Interrupted system call
  2020-10-28 07:44:24,510 ERROR    Network plugin raised an exception.
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/landscape/sysinfo/sysinfo.py", line 99, in run
      result = plugin.run()

  I've also attached the entire content of /var/crash and /var/log
  (according to /var/crash it looks like there is also another problem, since I see UI.crash and install_fail.crash)

  I logs let me assume that there is an issue with sfdisk that makes me
  remembering LP 1899471.

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