In recent composes, the openQA software RAID install tests all crash. The traceback is:

02:32:25,557 CRT exception: Traceback (most recent call last):

  File "/usr/lib64/python3.10/site-packages/pyanaconda/threading.py", line 275, in run
    threading.Thread.run(self)

  File "/usr/lib64/python3.10/threading.py", line 946, in run
    self._target(*self._args, **self._kwargs)

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation.py", line 415, in run_installation
    queue.start()

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation_tasks.py", line 311, in start
    item.start()

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation_tasks.py", line 311, in start
    item.start()

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation_tasks.py", line 311, in start
    item.start()

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation_tasks.py", line 496, in start
    self.run_task()

  File "/usr/lib64/python3.10/site-packages/pyanaconda/installation_tasks.py", line 527, in run_task
    sync_run_task(self._task_proxy)

  File "/usr/lib64/python3.10/site-packages/pyanaconda/modules/common/task/__init__.py", line 46, in sync_run_task
    task_proxy.Finish()

  File "/usr/lib/python3.10/site-packages/dasbus/client/handler.py", line 444, in _call_method
    return self._get_method_reply(

  File "/usr/lib/python3.10/site-packages/dasbus/client/handler.py", line 477, in _get_method_reply
    return self._handle_method_error(error)

  File "/usr/lib/python3.10/site-packages/dasbus/client/handler.py", line 497, in _handle_method_error
    raise exception from None

dasbus.error.DBusError: Process reported exit code 1: mdadm: specifying chunk size is forbidden for this level

I expect this is likely due to a change in mdadm 4.2 RC2, which landed recently.

Proposing as a Beta blocker as a violation of "When using both the installer-native and the blivet-gui-based custom partitioning flow, the installer must be able to: ... Create mount points backed by ext4 partitions, LVM volumes or btrfs volumes, or software RAID arrays at RAID levels 0, 1 and 5 containing ext4 partitions" - https://fedoraproject.org/wiki/Fedora_35_Beta_Release_Criteria#Custom_partitioning