If the pool is on top of LUKS (a relatively common configuration when
ZFS and cryptsetup are both being used), then you'd need cryptsetup
first. My advice is that you should either stop encrypting swap or start
encrypting the whole pool. Hopefully in another (Ubuntu) release or two,
we'll have native ZFS encryption and this whole things Just Works.

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  cryptsetup waits for zvol /dev/zvol/rpool/swap with no zpool imported
  during boot. Timing problem?

Status in zfs-linux package in Ubuntu:

Bug description:
  first of all: I don't know if it is a bug in cryptsetup-initramfs or 
zfs-initramfs or another one.

  The problem is that since my upgrade from bionic to cosmic the
  cryptsetup tries too early to setup my cryptswap device which is on a

    cryptsetup: Waiting for encrypted source device /dev/zvol/rpool/swap...
         ALERT! encrypted source device /dev/zvol/rpool/swap does not exist, 
can't unlock cryptswap1.
  After timeout I find myself in a initramfs-shell (initramfs).
  When I do zpool list there is no zpool importet.

    zpool import -N rpool

  the cryptsetup succeeds.


  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: cryptsetup-initramfs 2:2.0.4-2ubuntu2
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Fri Nov  9 10:01:19 2018
  EcryptfsInUse: Yes
  PackageArchitecture: all
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport: [modified]
  modified.conffile..etc.logrotate.d.apport: [modified]
  mtime.conffile..etc.default.apport: 2015-03-15T20:01:19.851334
  mtime.conffile..etc.logrotate.d.apport: 2018-05-18T08:58:12.902005

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