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X-CSE-ConnectionGUID: LdjRRKYZQRyDbmPd95+ndg== X-CSE-MsgGUID: 1GNj9RvLQCCFcE5mKiV/1A== X-IronPort-AV: E=McAfee;i="6800,10657,11799"; a="84667720" X-IronPort-AV: E=Sophos;i="6.24,172,1774335600"; d="scan'208";a="84667720" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2026 20:37:04 -0700 X-CSE-ConnectionGUID: 9tw/tX+3TA6AZxu81HsDuA== X-CSE-MsgGUID: GV7OQcSwTxah8U1H4U8gMQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.24,172,1774335600"; d="scan'208";a="247381323" Received: from sghuge-mobl2.amr.corp.intel.com (HELO [10.125.111.27]) ([10.125.111.27]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 May 2026 20:37:03 -0700 Message-ID: <089e8bae-73c6-47a1-a046-6ddd8610d21b@intel.com> Date: Wed, 27 May 2026 20:36:29 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Handle Ice Lake MONITOR erratum To: Jim Mattson , dave.hansen@linux.intel.com Cc: andrew.cooper3@citrix.com, len.brown@intel.com, linux-kernel@vger.kernel.org, peterz@infradead.org, rafael.j.wysocki@intel.com, srinivas.pandruvada@linux.intel.com, stable@vger.kernel.org, x86@kernel.org, meenashanmugam@google.com, eranian@google.com References: <20250421192205.7CC1A7D9@davehans-spike.ostc.intel.com> <20260528030604.2669758-1-jmattson@google.com> Content-Language: en-US From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit 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.