I tried an upstream kernel (4.4.48-040448-generic #201702090334). This is still doing the same thing.
I have seen the messages below logged relating to the DVD drive when lshw is run. If I remove the DVD drive from the VM hardware the issue goes away. Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044077] sr 0:0:0:1: [sr0] tag#2 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044082] sr 0:0:0:1: [sr0] tag#2 Sense Key : Not Ready [current] Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044085] sr 0:0:0:1: [sr0] tag#2 Add. Sense: Medium not present - tray closed Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044088] sr 0:0:0:1: [sr0] tag#2 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044090] blk_update_request: critical target error, dev sr0, sector 0 Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044158] sr 0:0:0:1: [sr0] unaligned transfer Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044162] sr 0:0:0:1: [sr0] unaligned transfer Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044165] sr 0:0:0:1: [sr0] unaligned transfer Feb 16 11:59:10 ubuntu16-test kernel: [ 88.044168] sr 0:0:0:1: [sr0] unaligned transfer These "unaligned transfer" messages repeat about 100 times. All messages have an identical time though the symptoms of the high cpu wait % last about a minute. This does not occur in a 16.04 VM on VMware with a DVD drive, so the issue seems to be how the DVD drive is handled on the 4.4 kernel in a Hyper-V VM. Is there a workaround to make it skip the DVD drive if empty? -- 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/1663263 Title: lshw run on Hyper-V VM hangs system Status in linux package in Ubuntu: Confirmed Status in linux source package in Xenial: Confirmed Bug description: When running lshw the VM sits scanning SCSI for a full minute. At the same time CPUs show 100% usage. This appears to happen on all 4.4 kernel versions running as virtual machines on Hyper-V even with the latest integration services. This did not happen on earlier kernel versions. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-62-generic 4.4.0-62.83 ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40 Uname: Linux 4.4.0-62-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 9 13:29 seq crw-rw---- 1 root audio 116, 33 Feb 9 13:29 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Date: Thu Feb 9 15:02:52 2017 HibernationDevice: RESUME=/dev/mapper/ubuntu16--test--vg-swap_1 InstallationDate: Installed on 2017-02-09 (0 days ago) InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: MachineType: Microsoft Corporation Virtual Machine PciMultimedia: ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcFB: 0 hyperv_fb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-62-generic.efi.signed root=/dev/mapper/ubuntu16--test--vg-root ro RelatedPackageVersions: linux-restricted-modules-4.4.0-62-generic N/A linux-backports-modules-4.4.0-62-generic N/A linux-firmware 1.157.8 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/26/2012 dmi.bios.vendor: Microsoft Corporation dmi.bios.version: Hyper-V UEFI Release v1.0 dmi.board.asset.tag: None dmi.board.name: Virtual Machine dmi.board.vendor: Microsoft Corporation dmi.board.version: Hyper-V UEFI Release v1.0 dmi.chassis.asset.tag: 1717-5533-3372-2633-2683-8440-10 dmi.chassis.type: 3 dmi.chassis.vendor: Microsoft Corporation dmi.chassis.version: Hyper-V UEFI Release v1.0 dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0: dmi.product.name: Virtual Machine dmi.product.version: Hyper-V UEFI Release v1.0 dmi.sys.vendor: Microsoft Corporation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1663263/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
