@thadeu,

To respond your question "What is the exact problem this is causing?"

So far it's not causing much problem, it's pretty harmless, but while
running sosreport block plugin (which most Canonical customer uses) it
may lead to output "blk" error to the stderr and save syslog ||
kern.log.

As an fyi, we are re-working the sosreport block plugin upstream to
prevent to query unused disk, but still, while I agree with your EIO
statement, I don't think a detached loop device should behave
differently from a "never" detached loop device, if there current state
is "unused" unless I missed something. IMHO they should produce
consistent behaviour if 'unused' no ?

- Eric

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1856871

Title:
  i/o error if next unused loop device is queried

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