apport information

** Attachment added: "UdevDb.txt"
   https://bugs.launchpad.net/bugs/1718761/+attachment/4954651/+files/UdevDb.txt

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https://bugs.launchpad.net/bugs/1718761

Title:
  It's not possible to use OverlayFS (mount -t overlay) to stack
  directories on a ZFS volume

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  ---------- Configuration
  # echo -e $(grep VERSION= /etc/os-release)\\nSIGNATURE=\"$(cat 
/proc/version_signature)\"
  VERSION="16.04.3 LTS (Xenial Xerus)"
  SIGNATURE="Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17"
  # dpkg --list | grep zfs
  ii      libzfs2linux    0.6.5.6-0ubuntu18
  ii      zfs-doc         0.6.5.6-0ubuntu18
  ii      zfs-initramfs   0.6.5.6-0ubuntu18
  ii      zfs-zed         0.6.5.6-0ubuntu18
  ii      zfsutils-linux  0.6.5.6-0ubuntu18

  ---------- Fault: Creating an overlay of multiple directories on a ZFS volume 
does not work
  # df /var/tmp
  Filesystem     Type 1K-blocks  Used Available Use% Mounted on
  tank07/var/tmp zfs  129916288   128 129916160   1% /var/tmp
  # mkdir /var/tmp/{lower,middle,upper,workdir,overlay}
  # mount -t overlay overlay 
-olowerdir=/var/tmp/middle:/var/tmp/lower,upperdir=/var/tmp/upper,workdir=/var/tmp/workdir
 /var/tmp/overlay
  mount: wrong fs type, bad option, bad superblock on overlay,
         missing codepage or helper program, or other error

         In some cases useful info is found in syslog - try
         dmesg | tail or so.
  # dmesg|tail -1
  [276328.438284] overlayfs: filesystem on '/var/tmp/upper' not supported as 
upperdir

  ---------- Control test 1: Creating an overlay of multiple directories on 
another filesystem works
  # df /tmp
  Filesystem     Type  1K-blocks   Used Available Use% Mounted on
  tmpfs          tmpfs   1048576 133492    915084  13% /tmp
  # mkdir /tmp/{lower,middle,upper,workdir,overlay}
  # mount -t overlay overlay 
-olowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir 
/tmp/overlay
  # mount | grep overlay
  overlay on /tmp/overlay type overlay 
(rw,relatime,lowerdir=/tmp/middle:/tmp/lower,upperdir=/tmp/upper,workdir=/tmp/workdir)

  ---------- Control test 2: Creating an overlay using AuFS works on ZFS volume 
and elsewhere
  # mount -t aufs -obr=/tmp/lower:/tmp/middle:/tmp/upper:/tmp/workdir none 
/tmp/overlay
  # mount -t aufs 
-obr=/var/tmp/lower:/var/tmp/middle:/var/tmp/upper:/var/tmp/workdir none 
/var/tmp/overlay
  # mount | grep aufs
  none on /var/tmp/overlay type aufs (rw,relatime,si=9ead1ecae778b250)
  none on /tmp/overlay type aufs (rw,relatime,si=9ead1ec9257d1250)

  ---------- Remark
  While the use of AuFS can be used as a workaround in the above scenario, AuFS 
in turn will not work with [fuse.]glusterfs mounts (this has been documented 
elsewhere). Given that OverlayFS is part of the (upstream) kernel and Ubuntu 
now officially supports ZFS, the above should be fixed.
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 18 16:12 seq
   crw-rw---- 1 root audio 116, 33 Sep 18 16:12 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: Red Hat KVM
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: 
BOOT_IMAGE=/ROOT/ubuntu1604@/boot/vmlinuz-4.10.0-35-generic 
root=ZFS=tank07/ROOT/ubuntu1604 ro
  ProcVersionSignature: Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-35-generic N/A
   linux-backports-modules-4.10.0-35-generic  N/A
   linux-firmware                             1.157.12
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.10.0-35-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.9.1-5.el7_3.3
  dmi.chassis.type: 1
  dmi.chassis.vendor: Red Hat
  dmi.chassis.version: RHEL 7.3.0 PC (i440FX + PIIX, 1996)
  dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.9.1-5.el7_3.3:bd04/01/2014:svnRedHat:pnKVM:pvrRHEL7.3.0PC(i440FX+PIIX,1996):cvnRedHat:ct1:cvrRHEL7.3.0PC(i440FX+PIIX,1996):
  dmi.product.name: KVM
  dmi.product.version: RHEL 7.3.0 PC (i440FX + PIIX, 1996)
  dmi.sys.vendor: Red Hat
  --- 
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 18 16:12 seq
   crw-rw---- 1 root audio 116, 33 Sep 18 16:12 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  DistroRelease: Ubuntu 16.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: Red Hat KVM
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: 
BOOT_IMAGE=/ROOT/ubuntu1604@/boot/vmlinuz-4.10.0-35-generic 
root=ZFS=tank07/ROOT/ubuntu1604 ro
  ProcVersionSignature: Ubuntu 4.10.0-35.39~16.04.1-generic 4.10.17
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-35-generic N/A
   linux-backports-modules-4.10.0-35-generic  N/A
   linux-firmware                             1.157.12
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  xenial
  Uname: Linux 4.10.0-35-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.9.1-5.el7_3.3
  dmi.chassis.type: 1
  dmi.chassis.vendor: Red Hat
  dmi.chassis.version: RHEL 7.3.0 PC (i440FX + PIIX, 1996)
  dmi.modalias: 
dmi:bvnSeaBIOS:bvr1.9.1-5.el7_3.3:bd04/01/2014:svnRedHat:pnKVM:pvrRHEL7.3.0PC(i440FX+PIIX,1996):cvnRedHat:ct1:cvrRHEL7.3.0PC(i440FX+PIIX,1996):
  dmi.product.name: KVM
  dmi.product.version: RHEL 7.3.0 PC (i440FX + PIIX, 1996)
  dmi.sys.vendor: Red Hat

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