(machine assisted) analysis let me think that (in short):

The fix of this belongs to the driver; the probe should use a
bounded/interruptible wait (`wait_for_completion_timeout()` /
`_interruptible`), so that an unresponsive HMC yields a clean error
instead of an unkillable `D`-state task.

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https://bugs.launchpad.net/bugs/2156537

Title:
  Call Traces when booting stonking kernel 7.0.0-14 on s390x

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