[Bug 1377130] Re: Crash at creation of bcache if caching size > backing size

[Kick In]

Yes you can get rid of bcache0, but you can't re-use the device for
anything unless you reboot ( re bcache or just plain fdisk/parted ).

In fact whether you unmount before stopping the bcache or not doesn't change the behaviour. I did that this way in the  description, to show the process.
You just stop the caching device with the echo 1 > ... 
But, the backing is still in use and you have no control over it.

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https://bugs.launchpad.net/bugs/1377130

Title:
  Crash at creation of bcache if caching size > backing size

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