[Bug 1810235] Re: cryptsetup silently fails in live environment when given a raw "bcached" block device

[Robie Basak]

There is no action possible in the bcache-tools package so I'm marking
that task as Invalid - but the cryptsetup task remains open.

** Changed in: bcache-tools (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1810235

Title:
  cryptsetup silently fails in live environment when given a raw
  "bcached" block device

Status in bcache-tools package in Ubuntu:
  Invalid
Status in cryptsetup package in Ubuntu:
  Triaged

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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