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[Hadmut Danisch <hadmut@xxxxxxxxxx>]

Further observations:


I meanwhile figured out three modes:

1) putting the swap flag into /etc/crypttab   -> crashes the partition
every now and then, but not always.


2) removing the flag from /etc/crypttab, but keeping it in /etc/fstab and keeping it in 
/etc/initramfs-tools/conf.d/resume:   Everything works well , but  a) initramfs asks for the password twice (once per partition), which is sort of annoying, maybe the password sharing scripts coming with cryptsetup might work (didn't try yet with 15.10).


3) as 2, but removing /etc/initramfs-tools/conf.d/resume: Interesting effect. The bootprocess asks for password only once for the root partition(!), but systemd nevertheless mounts the swap partition as a second  luks device without needing the password.  Source code says something about a password cache, so the password from the root device seems to be cache for some time and accessible. Nice, but resume from hibernation does not work.  


Unfortunately the ubuntu installer produces mode 1, which does not
really work.

This mess should really be fixed for 16.04 LTS. In my eyes it's a major
problem of systemd, but the initramfs code could also be extended to use
the password cache (which is there and caches anyway) to avoid asking
twice.

regards

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1506139

Title:
  15.10beta crashes encrypted swap partition

Status in systemd package in Ubuntu:
  New

Bug description:
  Hi,

  I'm usually using a setup with three partitions on a disk

  Partition 1:  plain ext4 boot partition mounted on  /boot
  Partition 2:  luks-encrypted swap
  Partition 3: luks-encrypted btrfs for /  /home ...

  both mentioned in /etc/crypttab like

  sda2_crypt UUID=a7976d5c-6191-436d-9cf9-2cedf17d0893 none luks,swap,discard
  sda3_crypt UUID=339b9a90-8292-422d-a3cf-eeb0317e9f84 none luks,discard

  
  With several machines I have installed 15.10 beta on and in several cases I experienced the problem that the swap is not activated at boot time and that /dev/disks/by-uuid does not contain a link to the swap partition, and the previously created luks-encrypted swap is destroyed after boot: It is not a luks partition anymore and filled with random (presumably encrypted) bytes without structure. 

  I first thought that this is a problem of the setup process, and
  repaired the swap manually. But then I found the partition destroyed
  again. This happend several times on several machines.

  I am not sure yet what exactly would destroy the partition.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: cryptsetup 2:1.6.6-5ubuntu2
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Wed Oct 14 18:12:58 2015
  InstallationDate: Installed on 2015-10-08 (5 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  crypttab:
   sda2_crypt UUID=a7976d5c-6191-436d-9cf9-2cedf17d0893 none luks,swap,discard
   sda3_crypt UUID=339b9a90-8292-422d-a3cf-eeb0317e9f84 none luks,discard

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