Re: Ryzen GMP LIbrary Issue.

This is a multi-part message in MIME format...

------------=_1775322809-2533-21415
Content-Language: en-US
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

On 4/4/26 11:39 AM, Bruce Dubbs ([email protected] via lfs-support 
Mailing List) wrote:
> On 4/4/26 6:05 AM, Vinay Kumar ([email protected] via 
> lfs-support Mailing List) wrote:
>> Hi,
>>
>> I was trying to get each library one by one and in gmp website I have 
>> seen some notification related to ryzen 9950x. That some tests might 
>> damage the cpu. https:// gmplib.org/ <https://gmplib.org/>
>>
>> I am working on exactly the same system. This issue happens when we 
>> run some tests. Should I proceed with my work or wait for the fix from 
>> the GMP library issue. Or do you have any fixes for it?
>>
>> Some more details about my system:
>> CPU : Ryzen 9950x
>> Motherboard : asus hero x870e
>> Bios : latest which was released in february.
>> I am actually setting up the lfs in VirtualBOX.
>> I am using a corsair nautilus 360mm cooler. The issue happened with a 
>> simple air cooler.
> 
> I took a look at https://gmplib.org/gmp-zen5. It looks like a HW failure 
> to me. It could be the cooling system, the motherboard, or even the CPU 
> design itself. If you are concerned about the gmp tests, then skip them. 
> However there was this statement:
> 
> Neither of the 9950X CPUs died immediately, instead they died the exact 
> same way after a couple of months at high load. This seems to suggest a 
> gradual but predictable degradation.
> 
>    -- Bruce
> 
> 
> 

After reading the analysis from the GMP developers I tend to agree, but 
with I suspect it's actually a hardware bug. This sounds eerily similar 
to the problems we have with 13th and 14th-gen Intel Core i7s and i9s 
and gradually degrading (or outright failing catastrophically). In the 
case of the i7 and i9s though, that starts to exhibit itself with 
massive heat problems under load first - often meaning that the BIOS of 
the system hasn't been updated to resolve Intel's overvolting problem in 
the CPU scaling.

For the normal use case of LFS, Vinay, you should be safe to build. 
Running the GMP tests should be okay as long as you don't run them 
constantly in a loop.

If anyone is interested, this is the instruction (from the BMI2 
instruction set) that the GMP developers mention as possibly being part 
of the issue: https://www.felixcloutier.com/x86/mulx

-- 
- Doug

------------=_1775322809-2533-21415
Content-Type: text/plain; charset="UTF-8"
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
MIME-Version: 1.0

-- 
http://lists.linuxfromscratch.org/sympa/info/lfs-support
Unsubscribe: See the above information page
------------=_1775322809-2533-21415--