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[Launchpad Bug Tracker <1375266@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/precise-proposed/linux-lts-trusty

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https://bugs.launchpad.net/bugs/1375266

Title:
  amd-iommu: kernel BUG & lockup after shutting down KVM guest using PCI
  passthrough/PCIe bridge

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed

Bug description:
  SRU Justification:
  [Impact]
  When using a KVM VM and adding certain combinations of PCI/PCI-e devices an oops and freeze can occur when shutting down a VM.

  [Fix]
  Commit 9b29d3c6510407d91786c1cf9183ff4debb3473a which is upstream in 3.17-rc2 and in stable/3.16.y.
  This fix changes how cleanup_domain detaches device, instead of using the list_for_each_entyr_safe macro, it just iterates through the devices and removes the first element.

  [Test Case]
  Create KVM VM with a specific configuration of PCI/PCIe devices, and shutdown the VM. See https://bugzilla.kernel.org/show_bug.cgi?id=81841 for details.

  --

  This kernel lockup bug was reported to and fixed upstream:
  https://bugzilla.kernel.org/show_bug.cgi?id=81841

  Please backport the "stable" kernel patch to Ubuntu kernels (at least trusty, which I use in this setup):
  https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=9b29d3c6510407d91786c1cf9183ff4debb3473a

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.13.0-35-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/pcmC1D1p', '/dev/snd/pcmC1D2c', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D9p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Card1.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card1.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Mon Sep 29 16:19:50 2014
  HibernationDevice: RESUME=UUID=54378db4-8de4-45f0-b7cb-2d8e1097139d
  InstallationDate: Installed on 2014-09-04 (25 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-35-generic root=UUID=a8f2d0ae-f43e-47de-9ef9-99fed8c9c78e ro nomdmonddf nomdmonisw nomdmonddf nomdmonisw
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.7
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  dmi.bios.date: 01/24/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.90
  dmi.board.name: FM2A88X Extreme6+
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.90:bd01/24/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnFM2A88XExtreme6+:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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