** Tags added: kernel-hyper-v

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  kernel linux-image-4.15.0-44 not booting on Hyperv Server 2008R2

Status in linux package in Ubuntu:
Status in linux source package in Bionic:

Bug description:
  === SRU Justification ===

  NULL pointer dereference in netvsc_probe(). Module hv_netvsc is included
  in initramfs, so this blocks the boot process.

  For Hyper-V only supports single channel, rndis_filter_device_add()
  bails early and jump to tag "out". Subsequent code calls
  rndis_filter_device_remove() and returns ERR_PTR(ret), where ret is
  0 (sucess). Because of that, it passes IS_ERR(nvdev) check in
  netvsc_probe() and cause a NULL pointer dereference, as nvdev now is 0:

          if (nvdev->num_chn > 1)

  Correctly return net_device at the end of rndis_filter_device_add().

  Users report positive result.

  [Regression Potenial]
  Low. Trivial change, patches are in upstream sometime.

  === Original Bug Report ===

  Ubuntu stuck on booting on HyperV Server 2008R2.
  I saw kernel messages, seems to load ram image the boot is stuck.
  Seems to be a problem with hyperv drivers propably harddrive.
  Reverted back to the previous kernel.

  Description:    Ubuntu 18.04.1 LTS
  Release:        18.04Description:    Ubuntu 18.04.1 LTS
  Release:        18.04
  ProblemType: Bug
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 31 08:52 seq
   crw-rw---- 1 root audio 116, 33 Jan 31 08:52 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.5
  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:
  DistroRelease: Ubuntu 18.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  MachineType: Microsoft Corporation Virtual Machine
  Package: linux (not installed)

   PATH=(custom, no user)
  ProcFB: 0 hyperv_fb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic 
root=UUID=86036ccb-bc11-11e8-93c9-00155dfd7535 ro maybe-ubiquity
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
   linux-restricted-modules-4.15.0-43-generic N/A
   linux-backports-modules-4.15.0-43-generic  N/A
   linux-firmware                             1.173.3
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic uec-images
  Uname: Linux 4.15.0-43-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)

  _MarkForUpload: True
  dmi.bios.date: 03/19/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 090004
  dmi.board.name: Virtual Machine
  dmi.board.vendor: Microsoft Corporation
  dmi.board.version: 7.0
  dmi.chassis.asset.tag: 8531-7125-9206-2460-7819-2663-90
  dmi.chassis.type: 3
  dmi.chassis.vendor: Microsoft Corporation
  dmi.chassis.version: 7.0
  dmi.product.name: Virtual Machine
  dmi.product.version: 7.0
  dmi.sys.vendor: Microsoft Corporation

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