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[ChristianEhrhardt <1532571@xxxxxxxxxxxxxxxxxx>]

Hi Joseph,
yes the 4.2.8 seems to have the fix has well.

Any tag like kernel-fixed-upstream-stable for that?

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https://bugs.launchpad.net/bugs/1532571

Title:
  kvm crashes host kernel on trusty+hwe-w (unable to handle kernel
  paging request in __mtrr_lookup_var_next)

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When building the test environment for subiquity I end up with an image I can run with qemu/kvm.
  And I realized that this works fine with the Trusty kernel (Host), but when running on trusty+hwe-t (4.2.0-23-generic) it reliably crashes my host (not only the guest).

  On the good side it seems
  1. 1005 reproducible
  2. always the same issue

  The Commandline I run is:
  sudo qemu-system-x86_64 -smp 2 -m 1024 -enable-kvm -bios /usr/share/ovmf/OVMF.fd -drive snapshot=on,format=raw,cache=unsafe,if=ide,file=ubuntu-server-daily-wily-amd64-installer.img,serial=QM_INSTALL_01 -drive format=raw,cache=unsafe,if=ide,file=target.img_1,serial=QM_TARGET_01 -drive format=raw,cache=unsafe,if=virtio,file=target.img_2,serial=QM_TARGET_02 -drive format=raw,cache=unsafe,if=virtio,file=target.img_3,serial=QM_TARGET_03 -drive format=raw,cache=unsafe,if=virtio,file=target.img_4,serial=QM_TARGET_04 -global isa-fdc.driveA= -net user -net nic,model=e1000 -net nic,model=virtio -net nic,model=i82559er -monitor telnet:127.0.0.1:2446,server,nowait -serial stdio

  I'll attach what I've seen in dmesg, let me know if you need any more
  debug data.

  If one provides me a upload target I can share the image I boot (2GB).
  --- 
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=a36a1b98-ded1-42b1-8b9b-6f6f565ba2b6
  InstallationDate: Installed on 2015-08-14 (156 days ago)
  InstallationMedia: Kubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150219.1)
  MachineType: LENOVO 20BSCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-23-generic root=UUID=265add9d-4d61-40e3-956b-17ac2695c621 ro quiet splash nomdmonddf nomdmonisw crashkernel=384M-:128M vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-23.28~14.04.1-generic 4.2.6
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-23-generic N/A
   linux-backports-modules-4.2.0-23-generic  N/A
   linux-firmware                            1.127.19
  Tags:  trusty
  Uname: Linux 4.2.0-23-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip kvm libvirtd lp lpadmin lxd plugdev sambashare sbuild sudo
  _MarkForUpload: True
  dmi.bios.date: 06/26/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N14ET31W (1.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BSCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN14ET31W(1.09):bd06/26/2015:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BSCTO1WW
  dmi.product.version: ThinkPad X1 Carbon 3rd
  dmi.sys.vendor: LENOVO

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