[Bug 1875577] [NEW] Encrypted swap won't load on 20.04 with zfs root

Tue Apr 28 07:51:44 UTC 2020

Public bug reported:

root at eu1:/var/log# lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 20.04 LTS
Release:	20.04
Codename:	focal

root at eu1:/var/log# apt-cache policy cryptsetup
cryptsetup:
  Installed: (none)
  Candidate: 2:2.2.2-3ubuntu2
  Version table:
     2:2.2.2-3ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

OTHER BACKGROUND INFO:
======================

1. machine has 2 drives. each drive is partitioned into 2 partitions,
zfs and swap

2. Ubuntu 20.04 installed on ZFS root using debootstrap (debootstrap_1.0.118ubuntu1_all)

3. The ZFS root pool is a 2 partition mirror (the first partition of each disk)

4. /etc/crypttab is set up as follows:

swap      /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802914-part2    /dev/urandom   swap,cipher=aes-xts-plain64,size=256
swap      /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802933-part2    /dev/urandom   swap,cipher=aes-xts-plain64,size=256

WHAT I EXPECTED
===============

I expected machine would reboot and have encrypted swap that used two
devices under /dev/mapper

WHAT HAPPENED INSTEAD
=====================

On reboot, swap setup fails with the following messages in /var/log/syslog:

Apr 28 17:13:01 eu1 kernel: [    5.360793] systemd[1]: cryptsetup.target: Found ordering cycle on systemd-cryptsetup at swap.service/start
Apr 28 17:13:01 eu1 kernel: [    5.360795] systemd[1]: cryptsetup.target: Found dependency on systemd-random-seed.service/start
Apr 28 17:13:01 eu1 kernel: [    5.360796] systemd[1]: cryptsetup.target: Found dependency on zfs-mount.service/start
Apr 28 17:13:01 eu1 kernel: [    5.360797] systemd[1]: cryptsetup.target: Found dependency on zfs-load-module.service/start
Apr 28 17:13:01 eu1 kernel: [    5.360798] systemd[1]: cryptsetup.target: Found dependency on cryptsetup.target/start
Apr 28 17:13:01 eu1 kernel: [    5.360799] systemd[1]: cryptsetup.target: Job systemd-cryptsetup at swap.service/start deleted to break ordering cycle starting with cryptsetup.target/start
. . . . . .
Apr 28 17:13:01 eu1 kernel: [    5.361082] systemd[1]: Unnecessary job for /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802914-part2 was removed

Also, /dev/mapper does not contain any swap devices:

root at eu1:/var/log# ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 Apr 28 17:13 control
root at eu1:/var/log#

And top shows no swap:

MiB Swap:      0.0 total,      0.0 free,      0.0 used.  63153.6 avail
Mem

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1875577

Title:
  Encrypted swap won't load on 20.04 with zfs root

Status in cryptsetup package in Ubuntu:
  New

Bug description:
  root at eu1:/var/log# lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 20.04 LTS
  Release:	20.04
  Codename:	focal

  root at eu1:/var/log# apt-cache policy cryptsetup
  cryptsetup:
    Installed: (none)
    Candidate: 2:2.2.2-3ubuntu2
    Version table:
       2:2.2.2-3ubuntu2 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  OTHER BACKGROUND INFO:
  ======================

  1. machine has 2 drives. each drive is partitioned into 2 partitions,
  zfs and swap

  2. Ubuntu 20.04 installed on ZFS root using debootstrap (debootstrap_1.0.118ubuntu1_all)

  3. The ZFS root pool is a 2 partition mirror (the first partition of each disk)

  4. /etc/crypttab is set up as follows:

  swap      /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802914-part2    /dev/urandom   swap,cipher=aes-xts-plain64,size=256
  swap      /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802933-part2    /dev/urandom   swap,cipher=aes-xts-plain64,size=256

  WHAT I EXPECTED
  ===============

  I expected machine would reboot and have encrypted swap that used two
  devices under /dev/mapper

  WHAT HAPPENED INSTEAD
  =====================

  On reboot, swap setup fails with the following messages in /var/log/syslog:

  Apr 28 17:13:01 eu1 kernel: [    5.360793] systemd[1]: cryptsetup.target: Found ordering cycle on systemd-cryptsetup at swap.service/start
  Apr 28 17:13:01 eu1 kernel: [    5.360795] systemd[1]: cryptsetup.target: Found dependency on systemd-random-seed.service/start
  Apr 28 17:13:01 eu1 kernel: [    5.360796] systemd[1]: cryptsetup.target: Found dependency on zfs-mount.service/start
  Apr 28 17:13:01 eu1 kernel: [    5.360797] systemd[1]: cryptsetup.target: Found dependency on zfs-load-module.service/start
  Apr 28 17:13:01 eu1 kernel: [    5.360798] systemd[1]: cryptsetup.target: Found dependency on cryptsetup.target/start
  Apr 28 17:13:01 eu1 kernel: [    5.360799] systemd[1]: cryptsetup.target: Job systemd-cryptsetup at swap.service/start deleted to break ordering cycle starting with cryptsetup.target/start
  . . . . . .
  Apr 28 17:13:01 eu1 kernel: [    5.361082] systemd[1]: Unnecessary job for /dev/disk/by-id/nvme-SAMSUNG_MZVLB1T0HALR-00000_S3W6NX0M802914-part2 was removed

  Also, /dev/mapper does not contain any swap devices:

  root at eu1:/var/log# ls -l /dev/mapper
  total 0
  crw------- 1 root root 10, 236 Apr 28 17:13 control
  root at eu1:/var/log#

  And top shows no swap:

  MiB Swap:      0.0 total,      0.0 free,      0.0 used.  63153.6 avail
  Mem

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