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[Launchpad Bug Tracker <1754584@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package zfs-linux - 0.6.5.6-0ubuntu20

---------------
zfs-linux (0.6.5.6-0ubuntu20) xenial; urgency=medium

  * Fix mmap'd libaio read on non-prefaulted page deadlock (LP: #1754584)
    - Revert previous fix as there still is a potential for deadlock
      on the prefaulted page(s). Resolve the issue by only taking a
      reference on the page when copying it and not the page lock.
      The inode range lock protects against concurrent updates via
      zfs_read() and zfs_write().

 -- Colin Ian King <colin.king@xxxxxxxxxxxxx>  Wed, 28 Mar 2018 14:35:11
+0100

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

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https://bugs.launchpad.net/bugs/1754584

Title:
  zfs system process hung on container stop/delete

Status in Native ZFS for Linux:
  New
Status in linux package in Ubuntu:
  Fix Released
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 Artful:
  Fix Committed
Status in zfs-linux source package in Artful:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in zfs-linux source package in Bionic:
  Fix Released

Bug description:
  == SRU Request [Xenial][Artful] ==

  == Justification ==

  It is possible to hang zfs asynchronous reads if a read to a page that
  is mmap'd onto the the file being read is the same offset in the
  mapping as in the file. This is caused by two lock operations on the
  page.

  == Fix ==

  Upstream ZFS fix to ensure the page is not double-locked during async
  I/O of one or more pages.

  == Testing ==

  Create a zfs pool + zfs file system, run the reproducer program in
  comment #28 on the zfs filesystem.  Without the fix this can lock up,
  with the fix this runs to completion.

  == Regression Potential ==

  Minimal, the locking fix addresses a fundamental bug in the locking
  and this should not affect ZFS read/write I/O with this fix.

  ----------------------

  Summary:
  On a Bionic system running 4.15.0-10-generic, after attempting to build libaio in a Bionic daily container I cannot stop or delete the container. dmesg shows a variety of hung tasks

  Steps to Reproduce:
  Use the following script and watch for the the hang. At that point attempt to stop or delete the container: http://paste.ubuntu.com/p/SxfgbxM8v7/

  Originally filed against LXD: https://github.com/lxc/lxd/issues/4314

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-10-generic 4.15.0-10.11
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  powersj    2414 F.... pulseaudio
   /dev/snd/controlC0:  powersj    2414 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar  9 09:19:11 2018
  HibernationDevice: RESUME=UUID=40a4eb28-4454-44f0-a377-ea611ce685bb
  InstallationDate: Installed on 2018-02-19 (17 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214)
  Lsusb:
   Bus 001 Device 002: ID 8087:8001 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 002: ID 04f2:b45d Chicony Electronics Co., Ltd
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20BSCTO1WW
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-10-generic root=/dev/mapper/ubuntu--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-10-generic N/A
   linux-backports-modules-4.15.0-10-generic  N/A
   linux-firmware                             1.172
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/13/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET42W (1.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BSCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET42W(1.20):bd09/13/2017:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 3rd
  dmi.product.name: 20BSCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO
  ---
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  powersj    1878 F.... pulseaudio
   /dev/snd/controlC0:  powersj    1878 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  HibernationDevice: RESUME=UUID=40a4eb28-4454-44f0-a377-ea611ce685bb
  InstallationDate: Installed on 2018-02-19 (17 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180214)
  Lsusb:
   Bus 001 Device 002: ID 8087:8001 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 002: ID 04f2:b45d Chicony Electronics Co., Ltd
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20BSCTO1WW
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-12-generic root=/dev/mapper/ubuntu--vg-root ro
  ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-12-generic N/A
   linux-backports-modules-4.15.0-12-generic  N/A
   linux-firmware                             1.172
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  bionic
  Uname: Linux 4.15.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/13/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET42W (1.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BSCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET42W(1.20):bd09/13/2017:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad X1 Carbon 3rd
  dmi.product.name: 20BSCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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