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[SunnyDrake <beebop@xxxxxxx>]

tested on linux-image-4.7.0-040700rc5-generic_4.7.0-040700rc5.201606262232_amd64
problem still exist

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

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https://bugs.launchpad.net/bugs/1598068

Title:
  regression: amd-vi(amd_iommu) crash kernel

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  works in kernel 3.9
  not working in current 4.4.0-28-generic 
  kernel options ivrs_ioapic[x]= workaround to fix ivrs table
  cause kernel Oops on boot
  if needed can provide more info (dunno how dmesg not saved)

  Description:	Ubuntu 16.04 LTS
  Release:	16.04
  package:        linux-image-4.4.0-28-generic
  --- 
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  sunnydrake   1903 F.... pulseaudio
   /dev/snd/controlC2:  sunnydrake   1903 F.... pulseaudio
   /dev/snd/controlC0:  sunnydrake   1903 F.... pulseaudio
   /dev/snd/controlC1:  sunnydrake   1903 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=0b0b6284-f02f-4543-98d7-2e63ba854127
  InstallationDate: Installed on 2016-02-10 (142 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  MachineType: To be filled by O.E.M. To be filled by O.E.M.
  Package: linux (not installed)
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-28-generic root=/dev/mapper/ubuntu--vg--root--raid-lvm_root ro vfio_iommu_type1.allow_unsafe_interrupts=0 vfio_iommu_type1.disable_hugepages=1 modules-load=vfio-pci amd_iommu_dump=1 amd_iommu=1
  ProcVersionSignature: Ubuntu 4.4.0-28.47-generic 4.4.13
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-28-generic N/A
   linux-backports-modules-4.4.0-28-generic  N/A
   linux-firmware                            1.157.1
  RfKill:
   
  Tags:  xenial
  Uname: Linux 4.4.0-28-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-06-23 (8 days ago)
  UserGroups: adm cdrom dip fuse libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 10/25/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1605
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: M5A97
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  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.:bvr1605:bd10/25/2012:svnTobefilledbyO.E.M.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnASUSTeKCOMPUTERINC.:rnM5A97:rvrRev1.xx: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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