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[Launchpad Bug Tracker <1636517@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package zfs-linux - 0.6.5.6-0ubuntu15

---------------
zfs-linux (0.6.5.6-0ubuntu15) xenial; urgency=medium

  * Fix zpool import with vdev on zvol hang (LP: #1636517)
    Xenial kernel commit 193fb6a2c94fab8eb8ce70a5da4d21c7d4023bee
    ("block_dev: Support checking inode permissions in lookup_bdev()")
    added a flags argument to block_dev which caused this breakage. Add
    detection of 1 or 2 arg block_dev and add a zfs_block_dev shim to
    abstract these differences away. Kudos to Fabian Grünbichler for
    the original fix that this fix is based on.

 -- Colin Ian King <colin.king@xxxxxxxxxxxxx>  Tue, 25 Oct 2016 16:58:11
+0100

** Changed in: zfs-linux (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1636517

Title:
  zfs: importing zpool with vdev on zvol hangs kernel

Status in linux package in Ubuntu:
  Triaged
Status in zfs-linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in zfs-linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Committed
Status in zfs-linux source package in Yakkety:
  Fix Released
Status in linux source package in Zesty:
  Triaged
Status in zfs-linux source package in Zesty:
  Fix Released

Bug description:
  [SRU Request][Xenial][Yakkety]

  if a zvol of an existing, already imported zpool is a vdev of another
  zpool, a call to "zpool import" will everything zfs related. the stack
  trace is as follows:

  [<ffffffffc038d374>] taskq_wait+0x74/0xe0 [spl]
  [<ffffffffc038d42b>] taskq_destroy+0x4b/0x100 [spl]
  [<ffffffffc04a4afd>] vdev_open_children+0x12d/0x180 [zfs]
  [<ffffffffc04ae6cc>] vdev_root_open+0x3c/0xc0 [zfs]
  [<ffffffffc04a45f5>] vdev_open+0xf5/0x4d0 [zfs]
  [<ffffffffc048f11e>] spa_load+0x39e/0x1c60 [zfs]
  [<ffffffffc049170d>] spa_tryimport+0xad/0x450 [zfs]
  [<ffffffffc04c42d4>] zfs_ioc_pool_tryimport+0x64/0xa0 [zfs]
  [<ffffffffc04c770b>] zfsdev_ioctl+0x44b/0x4e0 [zfs]
  [<ffffffff8122124f>] do_vfs_ioctl+0x29f/0x490
  [<ffffffff812214b9>] SyS_ioctl+0x79/0x90
  [<ffffffff818318b2>] entry_SYSCALL_64_fastpath+0x16/0x71
  [<ffffffffffffffff>] 0xffffffffffffffff

  [Fix]
  zfsutils-linux:

  Zesty: https://launchpadlibrarian.net/290907232/zfs-
  linux_0.6.5.8-0ubuntu4_0.6.5.8-0ubuntu5.diff.gz

  Yakkety, likewise
  Xenial, likewise

  Sync'd fixes into kernel repos, patches in:
  http://kernel.ubuntu.com/~cking/zfs-lp-1636517

  [Regression Potential]

  Minimal. This just touched one line in the zfs module
  module/zfs/zvol.cand a shim wrapper in include/linux/blkdev_compat.h

  Tested and passes with the ubuntu kernel team autotest client zfs
  regression tests.

  =================================================================

  I traced this back to 193fb6a2c94fab8eb8ce70a5da4d21c7d4023bee (erged
  in 4.4.0-6.21), which added a second parameter to lookup_bdev without
  patching the zfs module (which needs to special case the vdev-on-zvol
  case, and uses this exact method only in this special casing code
  path).

  attached you can find the output of "zfs send -R" ing such a zvol
  ("brokenvol.raw"), running "zfs receive POOL/TARGET < FILE" followed
  by "zpool import" should reproduce the hang.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-45-generic 4.4.0-45.66
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Oct 25 15:46 seq
   crw-rw---- 1 root audio 116, 33 Oct 25 15:46 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Tue Oct 25 15:49:51 2016
  HibernationDevice: RESUME=/dev/mapper/xenial--vg-swap_1
  InstallationDate: Installed on 2016-10-25 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:

  ProcFB: 0 qxldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-45-generic root=/dev/mapper/hostname--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-45-generic N/A
   linux-backports-modules-4.4.0-45-generic  N/A
   linux-firmware                            1.157.4
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: rel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-2.7
  dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.9.3-0-ge2fc41e-prebuilt.qemu-project.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.7:cvnQEMU:ct1:cvrpc-i440fx-2.7:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-2.7
  dmi.sys.vendor: QEMU

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