OK Turns out my btrfs+floppy bug is indeed a kernel floppy matter, and
the btrfs scan just 'triggers' the fault.
The new kernel floppy maintainer says:-
This patch should fix the problem:
263c61581a38 ("block/floppy: fix contended case in floppy_queue_rq()")
The commit id in stable tree is 29ed45653bec.
> ubuntu kernel 5.4.0-42-generic
I think that these versions don't contain the fix. The fix is in the
5.4 kernel since 5.4.47 version.
SO, looks like my related comment is a red-herring and (should) be fixed
by routine updates to 5.4.0 ubuntu kernel updates!.
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https://bugs.launchpad.net/bugs/1460447
Title:
Boot slow, "scanning for btrfs filesystems" takes 100 seconds
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