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[Bug 1498206] Re: Fix CPU lockup on Hyper-V/Azure


Looks like this patch landed in v4.3-rc1:

commit 88c9281a9fba67636ab26c1fd6afbc78a632374f
Author: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Date:   Wed Aug 19 09:54:24 2015 -0700

    x86/hyperv: Mark the Hyper-V TSC as unstable

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: kernel-da-key kernel-hyper-v

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

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  Fix CPU lockup on Hyper-V/Azure

Status in linux package in Ubuntu:

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: 

  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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