From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Dave Hansen <dave.hansen@intel.com>,
Jim Mattson <jmattson@google.com>,
dave.hansen@linux.intel.com
Cc: Andrew Cooper <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
Subject: Re: [PATCH] Handle Ice Lake MONITOR erratum
Date: Thu, 28 May 2026 17:03:19 +0100 [thread overview]
Message-ID: <5b53ec55-67dc-45f7-b960-69bab3d38750@citrix.com> (raw)
In-Reply-To: <089e8bae-73c6-47a1-a046-6ddd8610d21b@intel.com>
On 28/05/2026 4:36 am, Dave Hansen wrote:
> 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.
I agree.
The symptoms we found were a hang on boot while bringing up APs, and
there were no machine checks in sight.
~Andrew
next prev parent reply other threads:[~2026-05-28 16:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-21 19:22 Dave Hansen
2025-04-21 19:32 ` Andrew Cooper
2025-04-21 23:02 ` srinivas pandruvada
2025-04-22 6:46 ` Ingo Molnar
2025-04-22 14:18 ` Dave Hansen
2025-04-22 19:35 ` Ingo Molnar
2026-05-28 3:06 ` Jim Mattson
2026-05-28 3:36 ` Dave Hansen
2026-05-28 16:03 ` Andrew Cooper [this message]
2026-05-28 17:47 ` Jim Mattson
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