Re: [PATCH] Handle Ice Lake MONITOR erratum

[Dave Hansen]

On 5/27/26 20:06, Jim Mattson wrote:
>> The erratum is called ICX143 in the "3rd Gen Intel Xeon Scalable
>> Processors, Codename Ice Lake Specification Update". It is Intel
>> document 637780, currently available here:
>>
>> 	https://cdrdv2.intel.com/v1/dl/getContent/637780
> The erratum says, "Due to this erratum, the processor may hang."
> 
> We are seeing some Ice Lake Xeon E5 machines panic due to hard lockups, and
> then the kdump kernel dies with "Fatal machine check from unknown source."
> Is this behavior consistent with this erratum?

That sounds like something different to me. I don't remember machine
checks being implicated for this erratum at all.

My usual rule of thumb is that machine checks mean bad hardware unless
there's a specific and compelling reason otherwise.