[Bug 1594073] Re: 16.04 - initrd fails to decrypt and mount /usr directory when it's on it's own cryptsetup partition

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: initramfs-tools (Ubuntu)
       Status: New => Confirmed

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Title:
  16.04 - initrd fails to decrypt and mount /usr directory when it's on
  it's own cryptsetup partition

Status in initramfs-tools package in Ubuntu:
  Confirmed

Bug description:
  Running Ubuntu 16.04 LTS, upgraded from a 15.10 that did not show the
  issue.

  Initramd fails at setting up the encrypted /usr partition.
  At the (initramfs) prompt the following command is accepted and succeeds at decrypting the partition:

  cryptsetup --key-file /root/etc/keys/sda5_usr open --type luks
  /dev/sda5 sda5_usr

  After entering the above command and pressing <Ctrl>+<d> to exit the initramfs shell, system boot resumes and completes successfully.
  /etc (in the initramd) does not have the crypttab file, which is present in the decrypted and mounted root filesystem in /root/etc.

  The problem manifests itself regardless that in /etc/initramfs-
  tools/initramfs.conf MODULES=most or MODULES=dep is set before
  generating the initrd.

  Terminal output of the failed boot up to the initramfs prompt:

  Begin: Running /scripts/init-premount ... done
  Begin: Mounting root file system ... Begin: Running /scripts/local-top ... Please unlock disk sda3_ubuntu_root:
  [ 120.025413] NET: Registered protocol family 38
  cryptsetup: sda3_ubuntu_root set up successfully
  done.
  Begin: Running /scripts/local-premount ... done.
  Begin: Will now check root file system ... fsck from util-linux 2.27.1
  [/sbin/fsck.ext4 (1) -- /dev/mapper/sda3_ubuntu_root] fsck.ext4 -a -C0 /dev/mapper/sda3_ubuntu_root
  Ubuntu_rootfs: clean, 44092/625056 files, 801590/2499604 blocks
  done.
  [ 126.996543] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null)
  done.
  Begin: mounting /usr file system ... Begin: Waiting for /usr file system ... Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  Begin: Running /scripts/local-block ... done.
  done.
  Gave up waiting for /usr device. Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT! UUID=6b18125b-32be-458c-a623-612a14e74eb3 does not exist. Dropping to a shell!

  BusyBox v1.22.1 (Ubuntu 1:1.22.0-15ubuntu1) built-in shell (ash)
  Enter 'help' for a list of built-in commands.

  (initramfs) _

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