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[Launchpad Bug Tracker <1498206@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 3.19.0-37.42

---------------
linux (3.19.0-37.42) vivid; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1518406

  [ K. Y. Srinivasan ]

  * SAUCE: Drivers: hv: vmbus: Fix a Host signaling bug
    - LP: #1508706

 -- Kamal Mostafa <kamal@xxxxxxxxxxxxx>  Fri, 20 Nov 2015 09:49:10 -0800

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

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https://bugs.launchpad.net/bugs/1498206

Title:
  Fix CPU lockup on Hyper-V/Azure

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Fix Released

Bug description:
  Description of problem:
  Large sized VMs with 32 VCPUs and more than 100G memory sometimes hang at boot, and the console keeps printing logs like "soft lockup - CPU#14 stuck for 23s!"

  This particular issue can be resolved with the following patch upstream: 
  https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/arch/x86/kernel/cpu?id=88c9281a9fba67636ab26c1fd6afbc78a632374f

  Repro rate is low.  To repro, provision a larger VM (i.e. G5 VM on
  Azure) and reboot many times, monitoring the console until the "soft
  lockup - CPU" error is seen.

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