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[Launchpad Bug Tracker <1630924@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.10.0-8.10

---------------
linux (4.10.0-8.10) zesty; urgency=low

  [ Tim Gardner ]

  * Release Tracking Bug
    - LP: #1664217

  * [Hyper-V] Bug fixes for storvsc (tagged queuing, error conditions)
    (LP: #1663687)
    - scsi: storvsc: Enable tracking of queue depth
    - scsi: storvsc: Remove the restriction on max segment size
    - scsi: storvsc: Enable multi-queue support
    - scsi: storvsc: use tagged SRB requests if supported by the device
    - scsi: storvsc: properly handle SRB_ERROR when sense message is present
    - scsi: storvsc: properly set residual data length on errors

  * Ubuntu16.10-KVM:Big configuration with multiple guests running SRIOV VFs
    caused KVM host hung and all KVM guests down. (LP: #1651248)
    - KVM: PPC: Book 3S: XICS cleanup: remove XICS_RM_REJECT
    - KVM: PPC: Book 3S: XICS: correct the real mode ICP rejecting counter
    - KVM: PPC: Book 3S: XICS: Fix potential issue with duplicate IRQ resends
    - KVM: PPC: Book 3S: XICS: Implement ICS P/Q states
    - KVM: PPC: Book 3S: XICS: Don't lock twice when checking for resend

  * overlay: mkdir fails if directory exists in lowerdir in a user namespace
    (LP: #1531747)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * CVE-2016-1575 (LP: #1534961)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * CVE-2016-1576 (LP: #1535150)
    - SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs

  * Miscellaneous Ubuntu changes
    - SAUCE: md/raid6 algorithms: scale test duration for speedier boots
    - SAUCE: Import aufs driver
    - d-i: Build message-modules udeb for arm64
    - rebase to v4.10-rc8

  * Miscellaneous upstream changes
    - Revert "UBUNTU: SAUCE: aufs -- remove .readlink assignment"
    - Revert "UBUNTU: SAUCE: (no-up) aufs: for v4.9-rc1, support setattr_prepare()"
    - Revert "UBUNTU: SAUCE: aufs -- Add flags argument to aufs_rename()"
    - Revert "UBUNTU: SAUCE: aufs -- Convert to use xattr handlers"
    - Revert "UBUNTU: SAUCE: Import aufs driver"

  [ Upstream Kernel Changes ]

  * rebase to v4.10-rc8

 -- Tim Gardner <tim.gardner@xxxxxxxxxxxxx>  Mon, 06 Feb 2017 08:34:24
-0700

** Changed in: linux (Ubuntu Zesty)
       Status: In Progress => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1575

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1576

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https://bugs.launchpad.net/bugs/1630924

Title:
  Kdump through NMI SMP and single core not working on Ubuntu16.10

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released
Status in linux source package in Zesty:
  Fix Released

Bug description:
  During some tests I've encountered an issue with kdump through NMI SMP
  and single core. After kdump configuration, when I trigger the crash
  through an NMI call from the host, the VM will panic, however it will
  not write the vmcore dump files and neither reboot.

  REPRO STEPS:

  1. configure kdump
   - crashkernel=512M-:384M  /boot/grub/grub.cfg
   - USE_KDUMP=1 /etc/default/kdump-tools

  2. after configuration reboot the VM

  3. check kdump status
   - cat /sys/kernel/kexec_*
   - service kdump-tools status

  4. configure NMI
   - sysctl -w kernel.unknown_nmi_panic=1

  5. trigger a crash from host
   - Debug-VM -Name $vmName -InjectNonMaskableInterrupt -ComputerName $hvServer -Force

  This case also applies to:
      -Ubuntu 16.10 generation 2(kernel version: 4.8.0-17-generic)
      -Ubuntu 16.04.1(kernel: 4.4.0-38-generic)
      -Ubuntu 14.04.5(kernel: 3.19.0-69-generic)

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