[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Paride Legovini]

Bug status updated accordingly. I set the linux task to Invalid as the
kernel was not involved after all. Thanks again Stéphane and Colin!

** Changed in: lxc (Ubuntu)
   Status: Confirmed => Fix Released

** Changed in: lxc (Ubuntu Cosmic)
   Status: Confirmed => Fix Released

** Changed in: lxc (Ubuntu Disco)
   Status: New => Fix Released

** Changed in: lxc (Ubuntu Eoan)
   Status: Confirmed => Fix Released

** No longer affects: linux (Ubuntu Eoan)

** No longer affects: linux (Ubuntu Disco)

** No longer affects: linux (Ubuntu Cosmic)

** Changed in: linux (Ubuntu)
   Status: Triaged => Invalid

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Invalid
Status in lxc package in Ubuntu:
  Fix Released
Status in lxc source package in Cosmic:
  Fix Released
Status in lxc source package in Disco:
  Fix Released
Status in lxc source package in Eoan:
  Fix Released

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Scott Moser]

best. fix. ever.

working after a reboot.

$ snap list lxd
Name  Version  RevTracking  Publisher   Notes
lxd   3.18 12211  stablecanonical✓  -

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Paride Legovini]

The current stable snap seems to fully address the issue. See:

https://github.com/lxc/lxd/issues/4656#issuecomment-542886330

and following.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Paride Legovini]

The released fix does not appear to fully address the problem:

https://github.com/lxc/lxd/issues/4656#issuecomment-542630903

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

A fix has landed in lxd, I refer you to the following comment:

https://github.com/lxc/lxd/issues/4656#issuecomment-541266681

Please check if this addresses the issues.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Mailing list: https://launchpad.net/~kernel-packages
Post to : 

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

See: https://github.com/lxc/lxd/issues/4656#issuecomment-535531229

In https://github.com/lxc/lxd/blob/master/lxd/storage_zfs_utils.go#L255
the umount is done by

err := unix.Unmount(mountpoint, unix.MNT_DETACH)

The umount2(2) manpage writes about MNT_DETACH:

Perform a lazy unmount: make the mount point unavailable for new
accesses, immediately disconnect the filesystem and all filesystems
mounted below it from each other and from the mount table, and actually
perform the unmount when the mount point ceases to be busy.

Could this be it? The MNT_DETACH umount looks partially asynchronous.
All the subsequent destroy commands may fail because they keep the mount
point busy. Finally the retry loop ends, the umount happens for real and
the following destroy succeeds.

—

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: 

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

Been digging into this a bit further with lxc 3.17 on Eoan.

lxc launch ubuntu:bionic zfs-bug-test
Creating zfs-bug-test
Starting zfs-bug-test
lxc delete zfs-bug-test --force
Error: Failed to destroy ZFS filesystem: Failed to run: zfs destroy -r 
default/containers/z1: cannot destroy 'default/containers/z1': dataset is busy

However, re-running the delete works fine:
lxd.lxc delete z1 --force

Looking at system calls, it appears that the first failing delete
--force command attempts to destroy the zfs file system multiple times
and then gives up. In doing so, it umounts the zfs file system.  Hence
the second time the delete is issued it works fine because zfs is now
umounted.  So it appears that the ordering in the delete is not as it
expected.

It seems to do:
zfs destroy x 10 (or so and then gives up because of errno 16 -EBUSY)
zfs umount

It should be doing:
zfs umount
zfs destroy

This matches the observed reference counting.  The ref count is only
dropped once the umount is complete. Attempts to destroy it before that
will cause an -EBUSY.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

The ZFS destroy checks the reference count on the dataset with
zfs_refcount_count(>ds_longholds) != expected_holds and returns
EBUSY in dsl_destroy_head_check_impl.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

Reproducer is as follows:

lxc launch ubuntu:bionic zfs-bug-test
Creating zfs-bug-test
Starting zfs-bug-test
lxc delete zfs-bug-test --force
Error: Failed to destroy ZFS filesystem:

Can reproduce this on Eoan with latest 5.2, 5.3 kernel.

** Also affects: linux (Ubuntu Eoan)
   Importance: Medium
 Assignee: Colin Ian King (colin-king)
   Status: Triaged

** Also affects: lxc (Ubuntu Eoan)
   Importance: Undecided
   Status: Confirmed

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
   Status: New

** Also affects: lxc (Ubuntu Disco)
   Importance: Undecided
   Status: New

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  New
Status in lxc source package in Disco:
  New
Status in linux source package in Eoan:
  Triaged
Status in lxc source package in Eoan:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
 

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Paride Legovini]

To be clear: point(3) above is what I see happening most of the time at
the moment.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Paride Legovini]

Hi,

I hit this issue on Bionic, Disco and Eoan. Our (server-team) Jenkins
nodes are often filled by stale LXD containers which are left there
because of "fails to destroy ZFS filesystem" errors.

Some thoughts and qualitative observations:

0. This is not a corner case, I see the problem all the time.

1. There is probably more than one issue involved here, even we get
similar error messages when trying to delete a container.

2. One issue is about mount namespaces: stray mounts that prevent to the
container to be deleted. This issue can be worked around by entering the
namespace and unmounting. The container can then be deleted. When this
happens retrying `lxd delete` doesn't help. This is described in [0]. I
think the newer versions of LXD are way less prone to end up in this
case.

3. In other cases `lxc delete --force` fails with the "ZFS dataset is
busy" error, but the deletion succeeds if the delete is retried
immediately after. In my case I don't even need to wait for a single
second: the second delete in `lxc delete --force  ; lxc delete `
already works. Stopping and deleting the container as separate
operations also works.

4. It has been suggested in [0] that LXD could retry the "delete"
operation if it fails. stgraber wrote that LXD *already* retries the
operation 20 times over 10 seconds, but the outcome is still a failure.
It is not clear to me how retrying manually works, while LXD auto-
retrying does not.

5. Some time ago (weeks) the error message changed from "Failed to
destroy ZFS filesystem: dataset is busy" to "Failed to destroy ZFS
filesystem:" with no other detail. I can't tell which specific upgrade
triggered this change.

6. I see this problem in both file-backed and device-backed zpools.

7. I'm not sure system load plays a role: I often hit the problem on my
lightly loaded laptop.

8. I don't have clear steps to reproduce the problem, but I personally
see it happening most of the time. While I don't have steps to reproduce
with 100% probability, I'm seeing this more times than I don't. But see
the next point.

9. In my experience a system can be in a "bad state" (the problem always
happens), or in a "good state" (the problem never happens). When the
system is in a "good state" we can `lxc delete` hundreds of containers
with no errors. I can't tell what makes a system switch from a good to a
bad state. I almost certain I also saw systems switching from a bad to a
good state.

10. The lxcfs package it not installed in the systems where I hit this
issue

That's it for the moment. Thanks for looking into this!

Paride

[0] https://github.com/lxc/lxd/issues/4656

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

Do we have any hunches on how to reproduce this issue?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Colin Ian King]

Cosmic is now end-of-life. Does this still occur on Disco?

** Changed in: linux (Ubuntu)
   Importance: High => Medium

** Changed in: linux (Ubuntu)
 Assignee: (unassigned) => Colin Ian King (colin-king)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Post to : kernel-packages@lists.launchpad.net
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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Brad Figg]

** Tags added: cscc

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Ryan Harper]

https://github.com/lxc/lxd/issues/4656

** Bug watch added: LXD bug tracker #4656
   https://github.com/lxc/lxd/issues/4656

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Post to : kernel-packages@lists.launchpad.net
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More help   : https://help.launchpad.net/ListHelp

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: lxc (Ubuntu Cosmic)
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
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More help   : https://help.launchpad.net/ListHelp

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: lxc (Ubuntu)
   Status: New => Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779156/+subscriptions

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Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
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More help   : https://help.launchpad.net/ListHelp

[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Ryan Harper]

This is still around.  Scott wrote up a script to handle cleaning this
up.

https://gist.github.com/smoser/2c78cf54a1e22b6f05270bd3fead8a5c

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  Confirmed
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  Confirmed

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

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[Kernel-packages] [Bug 1779156] Re: lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

[Joseph Salisbury]

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

** Also affects: linux (Ubuntu Cosmic)
   Importance: High
   Status: Triaged

** Tags added: kernel-da-key

** Also affects: lxc (Ubuntu)
   Importance: Undecided
   Status: New

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https://bugs.launchpad.net/bugs/1779156

Title:
  lxc 'delete' fails to destroy ZFS filesystem 'dataset is busy'

Status in linux package in Ubuntu:
  Triaged
Status in lxc package in Ubuntu:
  New
Status in linux source package in Cosmic:
  Triaged
Status in lxc source package in Cosmic:
  New

Bug description:
  I'm not sure exactly what got me into this state, but I have several
  lxc containers that cannot be deleted.

  $ lxc info
  
  api_status: stable
  api_version: "1.0"
  auth: trusted
  public: false
  auth_methods:
  - tls
  environment:
addresses: []
architectures:
- x86_64
- i686
certificate: |
  -BEGIN CERTIFICATE-
  
  -END CERTIFICATE-
certificate_fingerprint: 
3af6f8b8233c5d9e898590a9486ded5c0bec045488384f30ea921afce51f75cb
driver: lxc
driver_version: 3.0.1
kernel: Linux
kernel_architecture: x86_64
kernel_version: 4.15.0-23-generic
server: lxd
server_pid: 15123
server_version: "3.2"
storage: zfs
storage_version: 0.7.5-1ubuntu15
server_clustered: false
server_name: milhouse

  $ lxc delete --force b1
  Error: Failed to destroy ZFS filesystem: cannot destroy 
'default/containers/b1': dataset is busy

  Talking in #lxc-dev, stgraber and sforeshee provided diagnosis:

   | short version is that something unshared a mount namespace causing
   | them to get a copy of the mount table at the time that dataset was
   | mounted, which then prevents zfs from being able to destroy it)

  The work around provided was

   | you can unstick this particular issue by doing:
   |  grep default/containers/b1 /proc/*/mountinfo
   | then for any of the hits, do:
   |   nsenter -t PID -m -- umount 
/var/snap/lxd/common/lxd/storage-pools/default/containers/b1
   | then try the delete again

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.15.0-23-generic 4.15.0-23.25
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.10-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USERPID ACCESS COMMAND
   /dev/snd/controlC1:  smoser31412 F pulseaudio
   /dev/snd/controlC2:  smoser31412 F pulseaudio
   /dev/snd/controlC0:  smoser31412 F pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Jun 28 10:42:45 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (1071 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  MachineType: 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
 
b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff'
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-23-generic 
root=UUID=f897b32a-eacf-4191-9717-844918947069 ro quiet splash vt.handoff=1
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-23-generic N/A
   linux-backports-modules-4.15.0-23-generic  N/A
   linux-firmware 1.174
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: Intel Corporation
  dmi.bios.version: RYBDWi35.86A.0246.2015.0309.1355
  dmi.board.asset.tag: �
  dmi.board.name: NUC5i5RYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H40999-503
  dmi.chassis.asset.tag: �
  dmi.chassis.type: 3
  dmi.chassis.vendor: �
  dmi.chassis.version: �
  dmi.modalias: 
dmi:bvnIntelCorporation:bvrRYBDWi35.86A.0246.2015.0309.1355:bd03/09/2015:svn:pn:pvr:rvnIntelCorporation:rnNUC5i5RYB:rvrH40999-503:cvn:ct3:cvr:
  dmi.product.family: �
  dmi.product.name: �
  dmi.product.version: �
  dmi.sys.vendor: �

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