Gentoo.org: Major Linux/Athlon CPU bug discovered

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On Mon, 21 Jan 2002, Tom Diehl wrote:

>> > Yeah, I've had random lockups about once a day since I migrated work
>> > workstation at work to Linux. Completely random, always figured it was
>> > the soundblaster interaction. 
>> > 
>> > To see if you're vulnerable:
>> > Looks like I'm susceptible. I've since added the mem=nopentium line in
>> > grub. We'll see what happens....
>> 
>> The discussion I saw on the kernel list said
>> that linux wouldn't suffer at all.
>> The 4MiB pages are never used in the way
>> required to trigger this. (non aligned invalidate?)
>> 
>> Appearentl geentoo saw it with the NVIDIA kernel drivers,
>> and other questionable patches, which may trigger the bug.
>> 
>> Haven't saw a comment from Alan Cox on the subject yet
>> though, and he will probably clarify the issue.
>
>Both Alan Cox and Andrea Arcangeli among others have stated on lkmk that this
>is not a problem for linux. According to the lkml traffic gentoo did something
>weird to tweak this bug.

It is not fully clear how much Linux is affected at this point, 
other than that some people experiencing lockups who disable 
usage of 4M pages, no longer experience lockups.  I would think 
that is significant evidence that it is a problem in Linux.

>This is also Ot for this list. Sorry.

I tend to disagree.  It is definitely on topic for this list.  I
am the one who gets stuck with all of the XFree86 bug reports
reported in bugzilla, and I created this mailing list, so our
users would be able to discuss XFree86 issues.  It also allows me
to focus on issues directly related to XFree86 when I am quite 
busy, and still keep in touch with our user community.

Athlon CPU's locking up due to AGP/PSE bugs manifest themselves 
to me as "OpenGL applications lock up my system" bug reports.

Very much on topic.


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