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[Launchpad Bug Tracker <1579610@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.13.0-87.133

---------------
linux (3.13.0-87.133) trusty; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1585315

  [ Upstream Kernel Changes ]

  * Revert "usb: hub: do not clear BOS field during reset device"
    - LP: #1582864

linux (3.13.0-87.132) trusty; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1582398

  [ Kamal Mostafa ]

  * [Config] Drop ozwpan from the ABI

  [ Luis Henriques ]

  * [Config] CONFIG_USB_WPAN_HCD=n
    - LP: #1463740
    - CVE-2015-4004

  [ Prarit Bhargava ]

  * SAUCE: (no-up) ACPICA: Dispatcher: Update thread ID for recursive
    method calls
    - LP: #1577898

  [ Upstream Kernel Changes ]

  * usbnet: cleanup after bind() in probe()
    - LP: #1567191
    - CVE-2016-3951
  * KVM: x86: bit-ops emulation ignores offset on 64-bit
    - LP: #1423672
  * USB: usbip: fix potential out-of-bounds write
    - LP: #1572666
    - CVE-2016-3955
  * x86/mm/32: Enable full randomization on i386 and X86_32
    - LP: #1568523
    - CVE-2016-3672
  * Input: gtco - fix crash on detecting device without endpoints
    - LP: #1575706
    - CVE-2016-2187
  * atl2: Disable unimplemented scatter/gather feature
    - LP: #1561403
    - CVE-2016-2117
  * ALSA: usb-audio: Skip volume controls triggers hangup on Dell USB Dock
    - LP: #1577905
  * fs/pnode.c: treat zero mnt_group_id-s as unequal
    - LP: #1572316
  * propogate_mnt: Handle the first propogated copy being a slave
    - LP: #1572316
  * drm: Balance error path for GEM handle allocation
    - LP: #1579610
  * x86/mm: Add barriers and document switch_mm()-vs-flush synchronization
    - LP: #1538429
    - CVE-2016-2069
  * x86/mm: Improve switch_mm() barrier comments
    - LP: #1538429
    - CVE-2016-2069
  * net: fix infoleak in llc
    - LP: #1578496
    - CVE-2016-4485
  * net: fix infoleak in rtnetlink
    - LP: #1578497
    - CVE-2016-4486

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Tue, 24 May 2016 11:04:30 -0700

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-4004

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2069

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2117

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-2187

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-3672

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-3951

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-3955

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-4485

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-4486

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1579610

Title:
  drm.ko < kernel version 4.5 has a dead lock bug

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  This bug go the code path
  drvers/gpu/drm/{drm_prime.c,drm_gem.c}

  drm_gem_prime_fd_to_handle()
  | mutex_lock(&file_priv->prime.lock);
  | drm_gem_handle_create_tail()
  | | dev->driver->gem_open_object() (for amdgpu.ko driver, this is amdgpu_gem_object_open)
  | | drm_gem_handle_delete()
  | | | drm_gem_remove_prime_handles()
  | | | | mutex_lock(&filp->prime.lock);

  This causes the dead lock if gem_open_object() return with error.

  Patch fixing this is already in Linux 4.5:
  https://github.com/torvalds/linux/commit/6984128d01cf935820a0563f3a00c6623ba58109

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-generic 4.4.0.22.23
  ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  yuq        1566 F.... pulseaudio
   /dev/snd/controlC1:  yuq        1566 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon May  9 11:20:26 2016
  HibernationDevice: RESUME=UUID=2e71a82b-c613-4a96-88e3-0672a366c396
  InstallationDate: Installed on 2016-03-01 (69 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160228)
  IwConfig:
   enp7s0    no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. X58A-UD3R
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=c137e0c1-ad99-47f4-acf5-e7f4792afa9e ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/23/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: FE
  dmi.board.name: X58A-UD3R
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrFE:bd12/23/2010:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD3R:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: X58A-UD3R
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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