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[Launchpad Bug Tracker <1427075@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.19.0-12.12

---------------
linux (3.19.0-12.12) vivid; urgency=low

  [ Andy Whitcroft ]

  * [Packaging] do_common_tools should always be on
  * [Packaging] Provides: virtualbox-guest-modules when appropriate
    - LP: #1434579

  [ Chris J Arges ]

  * Revert "SAUCE: ext4: disable ext4_punch_hole for indirect filesystems"
    - LP: #1292234

  [ Leann Ogasawara ]

  * Release Tracking Bug
    - LP: #1439803

  [ Timo Aaltonen ]

  * SAUCE: i915_bpo: Provide a backport driver for Skylake & Cherryview
    graphics
    - LP: #1420774
  * SAUCE: i915_bpo: Update intel_ips.h file location
    - LP: #1420774
  * SAUCE: i915_bpo: Only support Skylake and Cherryview with the backport
    driver
    - LP: #1420774
  * SAUCE: i915_bpo: Rename the backport driver to i915_bpo
    - LP: #1420774
  * i915_bpo: [Config] Enable CONFIG_DRM_I915_BPO=m
    - LP: #1420774
  * SAUCE: i915_bpo: Add i915_bpo_*() calls for ubuntu/i915
    - LP: #1420774
  * SAUCE: i915_bpo: Revert "drm/i915: remove unused
    power_well/get_cdclk_freq api"
    - LP: #1420774
  * SAUCE: i915_bpo: Add i915_bpo specific power well calls
    - LP: #1420774
  * SAUCE: Backport I915_PARAM_MMAP_VERSION and I915_MMAP_WC
    - LP: #1420774
  * SAUCE: Partial backport of drm/i915: Add ioctl to set per-context
    parameters
    - LP: #1420774
  * SAUCE: drm/i915: Specify bsd rings through exec flag
    - LP: #1420774
  * SAUCE: drm/i915: add I915_PARAM_HAS_BSD2 to i915_getparam
    - LP: #1420774
  * SAUCE: drm/i915: add component support
    - LP: #1420774
  * SAUCE: drm/i915: Add tiled framebuffer modifiers
    - LP: #1420774
  * SAUCE: Backport new displayable tiling formats
    - LP: #1420774
  * SAUCE: Backport drm_crtc_vblank_reset() helper
    - LP: #1420774
  * SAUCE: drm/i915: Add I915_PARAM_REVISION
    - LP: #1420774
  * SAUCE: drm/i915: Export total subslice and EU counts
    - LP: #1420774
  * SAUCE: i915_bpo: Revert drm/mm: Support 4 GiB and larger ranges
    - LP: #1420774

  [ Upstream Kernel Changes ]

  * drm/i915/skl: Split the SKL PCI ids by GT
    - LP: #1420774
  * drm: Reorganize probed mode validation
    - LP: #1420774
  * drm: Perform basic sanity checks on probed modes
    - LP: #1420774
  * drm: Do basic sanity checks for user modes
    - LP: #1420774
  * drm/atomic-helper: Export both plane and modeset check helpers
    - LP: #1420774
  * drm/atomic-helper: Again check modeset *before* plane states
    - LP: #1420774
  * drm/atomic: Introduce state->obj backpointers
    - LP: #1420774
  * drm: allow property validation for refcnted props
    - LP: #1420774
  * drm: store property instead of id in obj attachment
    - LP: #1420774
  * drm: get rid of direct property value access
    - LP: #1420774
  * drm: add atomic_set_property wrappers
    - LP: #1420774
  * drm: tweak getconnector locking
    - LP: #1420774
  * drm: add atomic_get_property
    - LP: #1420774
  * drm: Remove unneeded braces for single statement blocks
    - LP: #1420774
  * drm: refactor getproperties/getconnector
    - LP: #1420774
  * drm: add atomic properties
    - LP: #1420774
  * drm/atomic: atomic_check functions
    - LP: #1420774
  * drm: small property creation cleanup
    - LP: #1420774
  * drm/atomic: atomic plane properties
    - LP: #1420774
  * drm/atomic: atomic connector properties
    - LP: #1420774
  * drm: Atomic modeset ioctl
    - LP: #1420774
  * drm/atomic: Hide drm.ko internal interfaces
    - LP: #1420774
  * drm: Ensure universal_planes is set for atomic
    - LP: #1420774
  * drm: fix mismerge in drm_crtc.c
    - LP: #1420774
  * drm: bit of spell-check / editorializing.
    - LP: #1420774
  * drm: add support for tiled/compressed/etc modifier in addfb2
    - LP: #1420774
  * drm: Add rotation value to plane state
    - LP: #1420774
  * drm: add helper to get crtc timings (v5)
    - LP: #1420774
  * drm: Adding edp1.4 specific dpcd macros
    - LP: #1420774
  * drm/plane-helper: Skip prepare_fb/cleanup_fb when newfb==oldfb
    - LP: #1420774
  * next: drm/atomic: Use copy_from_user to copy 64 bit data from user
    space
    - LP: #1420774
  * powerpc: Add PVR for POWER8NVL processor
    - LP: #1438938
  * kernel/sched/clock.c: add another clock for use with the soft lockup
    watchdog
    - LP: #1427075
  * powerpc: add running_clock for powerpc to prevent spurious softlockup
    warnings
    - LP: #1427075
  * ext4: fix indirect punch hole corruption
    - LP: #1292234
  * fm10k: Clean-up page reuse code
    - LP: #1397863
  * net/fm10k: Avoid double setting of NETIF_F_SG for the HW encapsulation
    feature mask
    - LP: #1397863
  * fm10k: Check tunnel header length in encap offload
    - LP: #1397863
  * fm10k: Increase the timeout for the data path reset
    - LP: #1397863
  * fm10k: Validate VLAN ID in fm10k_update_xc_addr_pf
    - LP: #1397863
  * fm10k: Resolve compile warnings with W=1
    - LP: #1397863
  * UBUNTU Config: CONFIG_IXGBE_VXLAN=y
    - LP: #1397861
  * ixgbe: cleanup sparse errors in new ixgbe_x550.c file
    - LP: #1397861
  * ixgbe: allow multiple queues in SRIOV mode
    - LP: #1397861
  * ixgbevf: enable multiple queue support
    - LP: #1397861
  * ixgbevf: add RSS support for X550
    - LP: #1397861
  * ixgbe: fix setting port VLAN
    - LP: #1397861
  * ixgbe: cleanup redundant default method set_rxpba
    - LP: #1397861
  * ixgbe: Cleanup probe to remove redundant attempt to ID PHY
    - LP: #1397861
  * ixgbe: add VXLAN offload support for X550 devices
    - LP: #1397861
  * ixgbevf: set vlan_features in a single write instead of several ORs
    - LP: #1397861
  * ixgbevf: Fix ordering of shutdown to correctly disable Rx and Tx
    - LP: #1397861
  * ixgbevf: Add code to check for Tx hang
    - LP: #1397861
  * ixgbevf: rewrite watchdog task to function similar to igbvf
    - LP: #1397861
  * ixgbevf: combine all of the tasks into a single service task
    - LP: #1397861
  * ixgbe: add Tx anti spoofing support
    - LP: #1397861
  * be2net: move definitions related to FW cmdsfrom be_hw.h to be_cmds.h
    - LP: #1439332
  * be2net: refactor code that checks flash file compatibility
    - LP: #1439332
  * be2net: avoid flashing SH-B0 UFI image on SH-P2 chip
    - LP: #1439332
  * of: iommu: Add ptr to OF node arg to of_iommu_configure()
    - LP: #1386490
  * of: Move of_dma_configure() to device.c to help re-use
    - LP: #1386490
  * of: Fix size when dma-range is not used
    - LP: #1386490
  * PCI: Add helper functions pci_get[put]_host_bridge_device()
    - LP: #1386490
  * of/pci: Add of_pci_dma_configure() to update DMA configuration
    - LP: #1386490
  * PCI: Update DMA configuration from DT
    - LP: #1386490
  * arm: dma-mapping: limit IOMMU mapping size
    - LP: #1386490
  * of: Calculate device DMA masks based on DT dma-range size
    - LP: #1386490
 -- Leann Ogasawara <leann.ogasawara@xxxxxxxxxxxxx>   Thu, 02 Apr 2015 11:09:43 -0700

** Changed in: linux (Ubuntu)
       Status: Fix Committed => Fix Released

-- 
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https://bugs.launchpad.net/bugs/1427075

Title:
  Stopping and starting KVM partitions results in guest kernel
  softlockup

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  [Impact]
  Stop/continue via qemu monitor can easily trigger soft-lockups due to incorrect VM timekeeping.

  [Test Case]
  On a single CPU KVM guest:
  yes > /dev/null &

  Followed by
  (qemu) stop

  Wait a while, then:
  (qemu) cont

  [Fix]
  The following commits upstream:
  commit 545a2bf742fb41f17d03486dd8a8c74ad511dec2
  commit 4be1b29795d692d512bb67b770665d6f8ea5cb0b

  --

  == Comment: #0 - Cyril Bur <cyrilbur@xxxxxxxxxxx> - 2015-02-23 18:03:41 ==
  +++ This bug was initially created as a clone of Bug #108455 +++

  I was investigating the cause of some ppc64le KVM guest softlockup
  warnings. On a single CPU KVM guest, I ran something to keep the guest
  busy:

  yes > /dev/null &

  Followed by

  (qemu) stop

  Wait a while, then:

  (qemu) cont

  We get a softlockup error:

  BUG: soft lockup - CPU#0 stuck for 9220s! [yes:2389]

  .__getnstimeofday
  .getnstimeofday
  .ktime_get_real
  .netif_receive_skb
  .ibmveth_poll
  .net_rx_action
  .__do_softirq
  .irq_exit
  .__do_irq
  .call_do_irq
  .do_IRQ

  I was going to file it away in the "don't do that" bin, but I notice
  x86 have something to detect a paused VM and avoid spewing the soft
  lockup error. Do we need something like this on ppc64?

  commit 5d1c0f4a80a6df73395fb3fc2c302510f8f09d36
  Author: Eric B Munson <emunson@xxxxxxxxx>
  Date:   Sat Mar 10 14:37:28 2012 -0500

      watchdog: add check for suspended vm in softlockup detector

      A suspended VM can cause spurious soft lockup warnings.  To avoid these, the
      watchdog now checks if the kernel knows it was stopped by the host and skips
      the warning if so.  When the watchdog is reset successfully, clear the guest
      paused flag.

  == Comment: #1 - Cyril Bur <cyrilbur@xxxxxxxxxxx> - 2015-02-23 18:03:55 ==
  Hi,

  I have been working on a fix for guest kernels. This requires two
  patches:

  1/2

  commit 545a2bf742fb41f17d03486dd8a8c74ad511dec2
  Author: Cyril Bur <cyrilbur@xxxxxxxxx>
  Date:   Thu Feb 12 15:01:24 2015 -0800

      kernel/sched/clock.c: add another clock for use with the soft
  lockup watchdog

  and 2/2

  commit 4be1b29795d692d512bb67b770665d6f8ea5cb0b
  Author: Cyril Bur <cyrilbur@xxxxxxxxx>
  Date:   Thu Feb 12 15:01:28 2015 -0800

      powerpc: add running_clock for powerpc to prevent spurious
  softlockup warnings

  Both are in upstream.

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