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| DATE | 2017-07-02 |
| FROM | Ruben Safir
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| SUBJECT | Subject: [Hangout - NYLXS] Major intel bug with Generation 7 and Xeon chips
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https://www.digitaltrends.com/computing/intel-hyperthreading-bug-kaby-skylake/
Disabling hyperthreading may be the best way to avoid newly discovered
Intel bug
By Jon Martindale — Updated June 27, 2017 2:35 am
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intel hyperthreading bug kaby skylake core i7 6700k
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Why it matters to you
Unexplained crashes while using Intel's sixth or seventh generation CPUs
could well be due to a bug with hyperthreading.
Update: Added Intel comment on the news.
A new bug discovered in the sixth and seventh generations of Intel’s
central processors can affect any chip with hyperthreading enabled.
Although a fix exists for some CPUs, it may be worth disabling
hyperthreading just in case you run afoul of its potentially quite
serious problems.
The microcode bug discovered in the Intel chips could, under certain
conditions, cause processors to behave erratically, leading to possible
application and system stability issues and even data corruption and
data loss, according to Debian.org. The problem can exist on any
operating system and will require a microcode update from Intel to fix
properly.
Since originally posting this article, Intel sent us a comment on the
news, suggesting that it began rolling out a fix for his bug several
months ago:
“We have already identified this issue and addressed it with a fix that
started rolling out in April 2017. As always, we recommend checking to
make sure your BIOS is up to date, but the chance of encountering this
issue is low, as it requires a complex number of concurrent
micro-architectural conditions to reproduce.”
The microcode fix for seventh-generation Kaby Lake processors is said to
be with motherboard manufacturers right now. It will be distributed as a
BIOS/UEFI update, so make sure to check your motherboard maker’s website
to see if there’s a recent release. If not, you may want to contact them
directly, but disabling hyperthreading in the meantime may be worthwhile.
For sixth-generation Skylake processors, there is an additional option,
though updating your BIOS would be the best first step. The Debian wiki
has further instructions on updating the microcode yourself, though it
won’t be possible for all processors of that generation, and you will
need to jump through a few hoops first.
If it seems overly technical, we’d again recommend disabling
hyperthreading for now instead.
If you’re unsure whether your CPU is one of the potentially affected
generations, there are a few things you can do. Intel has lists of
processors from each generation alongside a notification of whether they
support hyperthreading, but you’ll need to make sure you know your CPU’s
model number. Fortunately finding that out is easy on Windows 10 PCs.
Simply right-click on “My PC” select properties and you’ll be taken to
the system panel where your processor’s name and number will be listed
in an easy to read manner.
Check your CPU against the lists, and if you find it could be affected,
take appropriate action.
--
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