linux-kernel - Re: AMD FX CPU bug, not fixed by latest microcode?

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Date:	Wed, 13 Jun 2012 09:30:03 +0200
From:	Boszormenyi Zoltan <zboszor@...hu>
To:	Johannes Stezenbach <js@...21.net>
CC:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: AMD FX CPU bug, not fixed by latest microcode?

2012-06-11 13:05 keltezéssel, Johannes Stezenbach írta:
> On Mon, Jun 11, 2012 at 11:49:05AM +0200, Borislav Petkov wrote:
>> On Mon, Jun 11, 2012 at 10:43:18AM +0200, Borislav Petkov wrote:
>>> On Sun, Jun 10, 2012 at 09:24:13PM +0200, Boszormenyi Zoltan wrote:
>>>> I have an AMD FX-8120 boxed CPU in an ASUS M5A99X-EVO mainboard
>>>> with 32GB DDR3/1600 memory, running Fedora 17, upgraded from 16.
>>>> memtest86+ show no problems.
>> Ohe other thing: if there's an option in the BIOS to disable the IOMMU,
>> can you do that and try reproducing the issue with IOMMU disabled?
> Maybe not related, but I had bad memory in my Intel Core-i5
> based system some months ago which resulted in rare crashes,
> usually manifested itself as g++ ICEs when compiling a
> mid-sized  C++ project -- compiling a kernel with make -p4 showed
> no problem.  Also memtest86+ didn't show the issue,
> so I tried memtest86-4.0a which claims to find more errors
> due to SMP support.  An overnight run left me with a screen
> full of garbage and a crashed memtest86-4.0.  I replaced
> the RAM anyway and the box was stable since then.
>
> memtest86-4.0a is at
> http://memtest86.com/
>
> The page claims:
>    With a single CPU it is not possible to drive multi-channel memory
>    controllers at full speed making it impossible to detect some types of errors
>
> Maybe someone knowledgable could comment if this is true.

This one locked up on my machine but memtest86+ 4.20 detected
12 different addresses with faulty bits in the lower 16GB. Applying
for warranty.

With only two modules, "make -j8" succeeded a lot of times.

Thanks for everyone who tried to help.

Best regards,
Zoltán Böszörményi

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