Looks like this patch landed in v4.3-rc1:
commit 88c9281a9fba67636ab26c1fd6afbc78a632374f
Author: Vitaly Kuznetsov <[email protected]>
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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https://bugs.launchpad.net/bugs/1498206
Title:
Fix CPU lockup on Hyper-V/Azure
Status in linux package in Ubuntu:
Triaged
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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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1498206/+subscriptions
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