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  1. XenServer Org
  2. XSO-768

Skylake / KabyLake processor bug. New microcode available

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    Details

    • Type: Bug
    • Status: Done (View Workflow)
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 7.1, 7.2
    • Fix Version/s: 7.5
    • Component/s: Dom0
    • Labels:
      None
    • Environment:

      Supermicro X11SSV-Q motherboard.

      Intel Core i7 6700 and i7 7700.

      Xenserver 7.1 (and 7.2) with kernel 4.4.

      Description

      Kabylake and Skylake bug has been discovered just one week ago. We have experiencing weird behavior on boot with this kind of processors when HT is enabled with a Supermicro X11SSV-Q and Core i7 6700 and i7 7700. This could be directly related with this Intel bug.

      Problem raises when bringing up CPUs with this error:

      Failed to bring up CPU 1 ( error -5 )

      After one or two reboots, it manages to boot properly. But after this, sometimes some VMs hangs in a very suspicious way.

      There is a microcode.dat from Intel available in that could fix this.

      http://www.zdnet.com/article/debian-linux-reveals-intel-skylake-kaby-lake-processors-have-broken-hyper-threading/

       

      This microcode.dat could be included in a kernel update.

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            • Assignee:
              SimonCro Simon Crowe
              Reporter:
              inigoml Iñigo Martinez Lasala
            • Votes:
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              Dates

              • Created:
                Updated:
                Resolved: