Could this be solved with different ordering? Luks first, then bcache?
Luks definitely expects its header to be in a certain position:
LUKS EXTENSION
LUKS, the Linux Unified Key Setup, is a standard for disk encryption.
It adds a standardized header at the start of the device, a key-slot area
directly behind the header and the bulk data area behind that. The
whole set is called a 'LUKS container'. The device that a LUKS
container resides on is called a 'LUKS device'. For most purposes, both terms
can be used interchangeably. But note that when the LUKS header is at
a nonzero offset in a device, then the device is not a LUKS device
anymore, but has a LUKS container stored in it at an offset.
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https://bugs.launchpad.net/bugs/1810235
Title:
cryptsetup silently fails in live environment
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