[Bug 1810235] Re: cryptsetup silently fails in live environment

[Andreas Hasenack]

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

Status in bcache-tools package in Ubuntu:
  New
Status in cryptsetup package in Ubuntu:
  New

Bug description:
  When attempting to acccess an existing (working) LUKS partition from
  the LiveCD environment, cryptsetup fails silently. No exceptions are
  thrown, no errors displayed. The LUKS device remains completely
  inaccessible.

  I've attached an strace with the following two commands, "cryptsetup
  luksDump /dev/sda3", and "cryptsetup luksOpen /dev/sda3 crypted" as
  there was nothing in the logs that clearly point to a problem other
  than the expected result being missing.


  lsb-release:

  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=18.04
  DISTRIB_CODENAME=bionic
  DISTRIB_DESCRIPTION="Ubuntu 18.04.1 LTS"

      #uname -a
  Linux ubuntu 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: cryptsetup 2:2.0.2-1ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
  Uname: Linux 4.15.0-29-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CasperVersion: 1.394
  Date: Wed Jan  2 03:56:27 2019
  LiveMediaBuild: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C.UTF-8
   SHELL=/bin/bash
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  cmdline: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper quiet splash ---
  crypttab: # <target name>	<source device>		<key file>	<options>
  fstab:
   overlay / overlay rw 0 0
   tmpfs /tmp tmpfs nosuid,nodev 0 0

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