Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens
Date	2019-10-03 17:10 +0200
Message-ID	<yNaTT-7hW-3@gated-at.bofh.it> (permalink)
References	<yN4EN-3lE-1@gated-at.bofh.it> <yN4EN-3lE-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi

On Thu, Oct 03, 2019 at 09:24:26AM +0100, Anton Ivanov wrote:
> Package: src:linux
> Version: 4.19.67-2+deb10u1
> Severity: important
> 
> Dear Maintainer,
> 
> noht has no effect.
> 
> I have been trying to chase down a weird hang which occurs only on 6
> core/12 thread Ryzens (I cannot reproduce it on 4/8 or older CPUs).
> 
> As a part of that I tried to disable ht. Well, it cannot be disabled
> - the noht command line arg has no effect whatosever.
> 
> As ht can be a security hole this may have security implications as
> well.

Do you mean 'nosmt'? (See kernel-parameters.txt).

You can find further information as well in
Documentation/admin-guide/hw-vuln/l1tf.rst.

Regards,
Salvatore

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Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens Salvatore Bonaccorso <carnil@debian.org> - 2019-10-03 17:10 +0200
  Bug#941637: linux-image-4.19.0-6-amd64: noht flag on command line has no effect for 6 core/12 Thread Ryzens Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-10-03 23:00 +0200

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