kernel-packages team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Can you also test the latest upstream 4.2 stable kernel?  That will tell
us if the fix was cc'd to stable and has already landed upstream.

The latest 4.2 upstream stable kernel can be downloaded from:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2.8-wily/


** Tags added: needs-bisect

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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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