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  • KB4480963 breaks Hyper-V Live Migration on AMD Opteron 6376

    Home Forums AskWoody support Windows Windows 8.1 Windows 8.1 (and Win 8) patches KB4480963 breaks Hyper-V Live Migration on AMD Opteron 6376

    This topic contains 3 replies, has 2 voices, and was last updated by

     Freeco 4 days, 22 hours ago.

    • Author
    • #319457 Reply

      AskWoody Lounger

      We’re quite aggressive in our monthly patching campaign: 8 days after Patch Tuesday we’re fully patched (3000 Windows Servers). I’m quite proud of that actually 🙂

      This month however we’ve hit a hiccup with KB4480963 breaking the Live Migration feature on our 2 oldest Win2012R2 Hyper-V clusters. These are 2x 4 Dell R715 hosts with AMD Opteron 6376 CPU’s (yep, they’re old…).
      The VMs themselves are still running fine though. The problem’s limited to Live Migration which is unusable, thus no more servicing of the hosts without bringing the VMs down…
      Thought I’d share the knowledge and spare others the trouble, cause Microsoft hasn’t come up with a fix for it yet.

      I had contacted our HPE support guys 3 weeks ago, who in turn quite quickly escalated it to MS. At first the MS engineer didn’t even acknowledge it as a potential issue with KB4480963 as this hadn’t been reported before, and just referred to the security advisory for enabling the AMD specific Spectre/Meltdown mitigations, which are new since this KB.
      Well, somebody has to be the first to report a bug, right?

      Our HPE support guy also confirmed me today he was able to repro the issue on an HPE server with an AMD CPU from the same generation. So, definitely a bug in KB4480963 I’d say, it’s not strictly in our environment.

      I suppose there won’t be too many people running a combination of Win2012 R2 Hyper-V on AMD CPU’s with the Piledriver architecture. But for what it’s worth…

      2 users thanked author for this post.
    • #319484 Reply

      Da Boss

      Have you also reported this to

    • #319496 Reply

      AskWoody Lounger

      no, I haven’t . I come on this site quite regularly, but not (although I think in the past I’ve seen it being referenced here, I think)

    • #325352 Reply

      AskWoody Lounger

      the product team has now officially published it as a known issue in KB4480963:

      After installing this update, virtual machines may fail to restore after being “Saved and Restored” the first time. The error message is, “Failed to restore the virtual machine state: Cannot restore this virtual machine because the saved state data cannot be read. Delete the saved state data and then try to start the virtual machine. (0xC0370027).”

      This affects AMD Bulldozer Family 15h, AMD Jaguar Family 16h, and AMD Puma Family 16h (2nd-gen) microarchitectures.

      There should be a fix mid-Feb (so I hope they mean this evening in the Feb rollup)

      2 users thanked author for this post.

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