KB2855336 – July Update Rollup 2013 For WS2012 Has Been Updated With A Fix (KB2866029)

I just saw an update to KB2855336 (the update rollup) was updated with additional text:

If you have a Windows Server 2012-based Hyper-V cluster that uses NIC Teaming with virtual LAN (VLAN), and you install this update rollup before July 12, 2013, you may receive an "0x000000D1" Stop error when you perform a live migration of a virtual machine. For more information about this issue, click the following article number to view the article in the Microsoft Knowledge Base: KB2866029 "0x000000D1" Stop error when you perform a live migration of a virtual machine on a Windows Server 2012-based cluster.

Over on KB2866029 we can see:

Symptoms

Consider the following scenario:

• You have a Windows Server 2012-based Hyper-V cluster that uses NIC Teaming with virtual LAN (VLAN). 
• You perform a live migration of a virtual machine.
• You perform a live migration of the virtual machine back to the original host.

In this scenario, the host computer crashes. Additionally, you receive the following Stop error message:

STOP: 0x000000D1 (parameter1, parameter2, parameter3, parameter4)

Notes

• This issue occurs after you install update rollup KB2855336

   

• This Stop error describes an IRQL_NOT_LESS_OR_EQUAL issue.

The fix is to install the reoffered update rollup KB2855336, available through Windows Update.

My advice:

• If your hosts are broken now because you installed the July update rollup then reinstall the new update rollup.
• If you have not deployed the July update rollup then deny it, give it a couple of weeks, and then plan an install if there are no more reported issues.

This is a mess.