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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. I agree. The symptoms we found were a hang on boot while bringing up APs, and there were no machine checks in sight. ~Andrew