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    SubjectRe: AMD FX CPU bug, not fixed by latest microcode?
    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.


    Johannes


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