Hardware Intel Skylake & Kaby Lake nasty microcode bug

eva2000 · Jun 27, 2017

Latest Intel Skylake and Kaby Lake have a nasty microcode bug whihc would require motherboard bios updates to fix Intel's Skylake and Kaby Lake CPUs have nasty microcode bug

This means Intel Skylake - Core i7 6xxx and Xeon E3v5 and Kaby Lake - Core i7 7xxx and E3v6 processors.

During April and May, Intel started updating processor documentation with a new errata note, and over the weekend we learned why: Skylake and Kaby Lake silicon has a microcode bug.

The erratum is described in detail on the Debian mailing list, and affects Skylake and Kaby Lake Intel Core processors (in desktop, high-end desktop, embedded and mobile platforms), Xeon v5 and v6 server processors, and some Pentium models.

The Debian advisory says affected users need to disable hyper-threading “immediately” in their BIOS or UEFI settings, because the processors can “dangerously misbehave when hyper-threading is enabled.”
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Intel's errata note (for example in this document), describes the issue like this:

Under complex micro-architectural conditions, short loops of less than 64 instructions that use AH, BH, CH or DH registers as well as their corresponding wider register (eg RAX, EAX or AX for AH) may cause unpredictable system behaviour. This can only happen when both logical processors on the same physical processor are active.
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Hardware Intel Skylake & Kaby Lake nasty microcode bug

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Hardware Intel Skylake & Kaby Lake nasty microcode bug

eva2000 Administrator Staff Member

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