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[Launchpad Bug Tracker <1649292@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.8.0-40.43

---------------
linux (4.8.0-40.43) yakkety; urgency=low

  * linux: 4.8.0-40.43 -proposed tracker (LP: #1667066)

  [ Andy Whitcroft ]
  * NFS client : permission denied when trying to access subshare, since kernel
    4.4.0-31 (LP: #1649292)
    - fs: Better permission checking for submounts

  * shaking screen  (LP: #1651981)
    - drm/radeon: drop verde dpm quirks

  * [0bda:0328] Card reader failed after S3 (LP: #1664809)
    - usb: hub: Wait for connection to be reestablished after port reset

  * linux-lts-xenial 4.4.0-63.84~14.04.2 ADT test failure with linux-lts-xenial
    4.4.0-63.84~14.04.2 (LP: #1664912)
    - SAUCE: apparmor: fix link auditing failure due to, uninitialized var

  * In Ubuntu 17.04 : after reboot getting message in console like Unable to
    open file: /etc/keys/x509_ima.der (-2) (LP: #1656908)
    - SAUCE: ima: Downgrade error to warning

  * 16.04.2: Extra patches for POWER9 (LP: #1664564)
    - powerpc/mm: Fix no execute fault handling on pre-POWER5
    - powerpc/mm: Fix spurrious segfaults on radix with autonuma

  * ibmvscsis: Add SGL LIMIT (LP: #1662551)
    - ibmvscsis: Add SGL limit

  * [Hyper-V] Bug fixes for storvsc (tagged queuing, error conditions)
    (LP: #1663687)
    - scsi: storvsc: Enable tracking of queue depth
    - scsi: storvsc: Remove the restriction on max segment size
    - scsi: storvsc: Enable multi-queue support
    - scsi: storvsc: use tagged SRB requests if supported by the device
    - scsi: storvsc: properly handle SRB_ERROR when sense message is present
    - scsi: storvsc: properly set residual data length on errors

  * Ubuntu16.10-KVM:Big configuration with multiple guests running SRIOV VFs
    caused KVM host hung and all KVM guests down. (LP: #1651248)
    - KVM: PPC: Book 3S: XICS cleanup: remove XICS_RM_REJECT
    - KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter
    - KVM: PPC: Book 3S: XICS: Fix potential issue with duplicate IRQ resends
    - KVM: PPC: Book 3S: XICS: Implement ICS P/Q states
    - KVM: PPC: Book 3S: XICS: Don't lock twice when checking for resend

  * ISST-LTE:pNV: ppc64_cpu command is hung w HDs, SSDs and NVMe (LP: #1662666)
    - blk-mq: Avoid memory reclaim when remapping queues
    - blk-mq: Fix failed allocation path when mapping queues
    - blk-mq: Always schedule hctx->next_cpu

  * systemd-udevd hung in blk_mq_freeze_queue_wait testing unpartitioned NVMe
    drive (LP: #1662673)
    - percpu-refcount: fix reference leak during percpu-atomic transition

  * [Yakkety SRU] Enable KEXEC support in ARM64 kernel (LP: #1662554)
    - [Config] Enable KEXEC support in ARM64.

  * [Hyper-V] Fix ring buffer handling to avoid host throttling (LP: #1661430)
    - Drivers: hv: vmbus: On write cleanup the logic to interrupt the host
    - Drivers: hv: vmbus: On the read path cleanup the logic to interrupt the host
    - Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()

  * brd module compiled as built-in (LP: #1593293)
    - CONFIG_BLK_DEV_RAM=m

  * regession tests failing after stackprofile test is run (LP: #1661030)
    - SAUCE: fix regression with domain change in complain mode

  * Permission denied and inconsistent behavior in complain mode with 'ip netns
    list' command (LP: #1648903)
    - SAUCE: fix regression with domain change in complain mode

  * flock not mediated by 'k' (LP: #1658219)
    - SAUCE: apparmor: flock mediation is not being enforced on cache check

  * unexpected errno=13 and disconnected path when trying to open /proc/1/ns/mnt
    from a unshared mount namespace (LP: #1656121)
    - SAUCE: apparmor: null profiles should inherit parent control flags

  * apparmor refcount leak of profile namespace when removing profiles
    (LP: #1660849)
    - SAUCE: apparmor: fix ns ref count link when removing profiles from policy

  * tor in lxd: apparmor="DENIED" operation="change_onexec"
    namespace="root//CONTAINERNAME_<var-lib-lxd>" profile="unconfined"
    name="system_tor" (LP: #1648143)
    - SAUCE: apparmor: Fix no_new_privs blocking change_onexec when using stacked
      namespaces

  * apparmor_parser hangs indefinitely when called by multiple threads
    (LP: #1645037)
    - SAUCE: apparmor: fix lock ordering for mkdir

  * apparmor leaking securityfs pin count (LP: #1660846)
    - SAUCE: apparmor: fix leak on securityfs pin count

  * apparmor reference count leak when securityfs_setup_d_inode\ () fails
    (LP: #1660845)
    - SAUCE: apparmor: fix reference count leak when securityfs_setup_d_inode()
      fails

  * apparmor not checking error if security_pin_fs() fails (LP: #1660842)
    - SAUCE: apparmor: fix not handling error case when securityfs_pin_fs() fails

  * apparmor oops in bind_mnt when dev_path lookup fails (LP: #1660840)
    - SAUCE: apparmor: fix oops in bind_mnt when dev_path lookup fails

  * apparmor  auditing denied access of special apparmor .null fi\ le
    (LP: #1660836)
    - SAUCE: apparmor: Don't audit denied access of special apparmor .null file

  * apparmor label leak when new label is unused (LP: #1660834)
    - SAUCE: apparmor: fix label leak when new label is unused

  * apparmor reference count bug in label_merge_insert() (LP: #1660833)
    - SAUCE: apparmor: fix reference count bug in label_merge_insert()

  * apparmor's raw_data file in securityfs is sometimes truncated (LP: #1638996)
    - SAUCE: apparmor: fix replacement race in reading rawdata

  * unix domain socket cross permission check failing with nested namespaces
    (LP: #1660832)
    - SAUCE: apparmor: fix cross ns perm of unix domain sockets

  * Enable CONFIG_NET_DROP_MONITOR=m in Ubuntu Kernel (LP: #1660634)
    - [Config] CONFIG_NET_DROP_MONITOR=m

  * Linux kernel 4.8 hangs at boot up (LP: #1659340)
    - SAUCE: x86/efi: Always map first physical page into EFI pagetables

  * s390/kconfig: CONFIG_NUMA without CONFIG_NUMA_EMU does not make any sense on
    s390x (LP: #1557690)
    - [Config] CONFIG_NUMA_BALANCING=y
    - [Config] CONFIG_NUMA=y, CONFIG_NUMA_EMU=y for s390x

 -- Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>  Wed, 22 Feb
2017 15:03:35 -0300

** Changed in: linux (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1649292

Title:
  NFS client : permission denied when trying to access subshare, since
  kernel 4.4.0-31

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  SRU Justification

  Impact: A regression has caused mounting of NFS subshares with
  kerberos authentication to fail. This is a result of
  follow_automount() overriding the user credentials before calling
  dentry->d_automount().

  Fix: Cherry pick from linux-next.

  Regression Potential: The commit fixes a regression and makes the
  automount behavior more like it was prior to changes in 4.8 (which we
  also backported to xenial). Therefore the regression potential should
  be minimal.

  ---

  Similar like Bug #1603719 or Bug #1604396 i got a "Permission denied"
  when trying to access a NFS subshare from our NFSv4 Server.

  I tried this under (K)ubuntu Trusty and Xenial and also with the
  ubuntu based Mint Versions 17.3 Rosa an 18 Sarah.

  Kernel Versions higher than 4.4.0-31 from offical Ubuntu Repository has the problem.
  Before 4.4.0-31 not. For safety reasons i used the linux-generic-lts-wily meta package

  The 4.4 mainline kernel also works without problem currently
  (4.4.37-040437-generic)

  Our NFS server runs under FreeBSD 11, but same problems to the clients
  with FreeBSD 10.3 and OmniOS r151018.

  All NFS servers use ZFS as the filesystem and NFSv4 with kerberos for
  sharing. For the basic structure we use  also ZFS filesystems.

  So my homefolder is located on the server under
  /apool/AIS/share/home/staff/fili/linux ... each level is a ZFS
  filesystem. On the client nfs share /apool/AIS/share/home is mounted
  under /home/VI

  My posix homedirectory path is /home/VI/staff/fili/linux

  When i try to login i got access to /home/VI/staff/fili ... but when i
  try to access the linux directory / zfs filesystem i got the
  permission denied.

  The fstab options for /home/VI are
  _netdev,rw,sync,sec=krb5,nfsvers=4,clientaddr=w.x.y.z

  I tried also autofs but with the same result.

  ---
  ApportVersion: 2.20.1-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  system     1812 F.... pulseaudio
   /dev/snd/controlC0:  system     1812 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=85a1880e-b78e-49d6-888c-342e47405712
  InstallationDate: Installed on 2016-10-17 (56 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  IwConfig:
   enp7s0    no wireless extensions.

   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-generic root=UUID=db11df78-a07d-44b5-8fe3-0f67e7a5ff51 ro
  ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-57-generic N/A
   linux-backports-modules-4.4.0-57-generic  N/A
   linux-firmware                            1.157.5
  RfKill:

  Tags:  xenial
  Uname: Linux 4.4.0-57-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 09/24/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1205
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T WS PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1205:bd09/24/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TWSPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  ---
  ApportVersion: 2.20.1-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  system     1876 F.... pulseaudio
   /dev/snd/controlC0:  system     1876 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=85a1880e-b78e-49d6-888c-342e47405712
  InstallationDate: Installed on 2016-10-17 (56 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  IwConfig:
   enp7s0    no wireless extensions.

   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB:

  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-generic root=UUID=db11df78-a07d-44b5-8fe3-0f67e7a5ff51 ro
  ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-57-generic N/A
   linux-backports-modules-4.4.0-57-generic  N/A
   linux-firmware                            1.157.5
  RfKill:

  Tags:  xenial xenial
  Uname: Linux 4.4.0-57-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 09/24/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1205
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6T WS PRO
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1205:bd09/24/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6TWSPRO:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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