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[Hadmut Danisch <hadmut@xxxxxxxxxx>]

OK, freshly rebootet.  This time, sda2 has survived as a valid and
operating luks partition.

crypttab and fstab not changed.

# swapon -s
Filename				Type		Size	Used	Priority
/dev/dm-1                              	partition	16308220	0	-1


# dir /dev/mapper
insgesamt 0
crw------- 1 root root 10, 236 Okt 15 22:17 control
lrwxrwxrwx 1 root root       7 Okt 15 22:18 sda2_crypt -> ../dm-1
lrwxrwxrwx 1 root root       7 Okt 15 22:17 sda3_crypt -> ../dm-0

# blkid 
/dev/mapper/sda3_crypt: UUID="9b9831d9-62f5-4fe0-872a-704bd66d5f7f" UUID_SUB="804b8d81-3f2b-4b24-894f-c63a71f3d442" TYPE="btrfs"
/dev/sda1: UUID="19e9998b-814c-4302-8003-f95e0e6a254e" TYPE="ext4" PARTUUID="04582fbe-af7b-4d10-ad4a-6d2277bbf679"
/dev/sda2: UUID="e1a46217-7f77-46b8-b109-320d11e47d83" TYPE="crypto_LUKS" PARTUUID="ab20073f-29c4-42d6-a971-af2cdb2e2339"
/dev/sda3: UUID="339b9a90-8292-422d-a3cf-eeb0317e9f84" TYPE="crypto_LUKS" PARTUUID="84cfaf1d-9da4-4c6c-bf45-6af03ba7b265"
/dev/mapper/sda2_crypt: UUID="aa426924-b1ae-478e-9d2a-dc838a2df367" TYPE="swap"


I'll attach journal.txt



** Attachment added: "journal.txt"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1506139/+attachment/4496078/+files/journal.txt

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https://bugs.launchpad.net/bugs/1506139

Title:
  15.10beta crashes encrypted swap partition

Status in systemd package in Ubuntu:
  Incomplete

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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