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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1532571/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
