[Bug 1377142] Re: Bcache doesn't allow full unregistering without rebooting

[Stefan Bader]

There does not seem to be clear documentation on this. Just a note that from your description I was not completely sure whether you did unmount before starting the release procedure. I would say unmount is a must.
Doing so, I also ended up in the state where bcache0 still existed. But I was able to get rid of that by

echo 1 >/sys/block/bcache0/bcache/stop

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Title:
  Bcache doesn't allow full unregistering without rebooting

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