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X-CSE-ConnectionGUID: Fc46ekKqTFeZE1BN83eFkA== X-CSE-MsgGUID: 3gjBtuGwQp6TwRtMLpKwGw== X-IronPort-AV: E=McAfee;i="6800,10657,11841"; a="84160066" X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="84160066" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jul 2026 07:51:36 -0700 X-CSE-ConnectionGUID: o7yN+QEvSs2tRlGHAcWRNw== X-CSE-MsgGUID: BmVY3ntjQdKYiB3avxNXtQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,153,1779174000"; d="scan'208";a="250947725" Received: from jmaxwel1-mobl.amr.corp.intel.com (HELO [10.125.111.66]) ([10.125.111.66]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jul 2026 07:51:35 -0700 Message-ID: Date: Wed, 8 Jul 2026 07:51:32 -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: PROBLEM: Probabilistic segfault on AMD hardware with INVLPGB To: Rik van Riel , Matt Fleming Cc: =?UTF-8?Q?Henrik_B=C3=B6ving?= , dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, Sebastian Ullrich , Joscha Mennicken , kernel-team@cloudflare.com, Borislav Petkov , Tom Lendacky References: <9363eca429424d967052bc401d4d835f1e6d2716.camel@surriel.com> <1e4ab5c5f64b3bddc0773cf305708500abc66999.camel@surriel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 7/7/26 07:11, Rik van Riel wrote: >>   ./repro-invlpgb --batch --rounds 20 --jobs 32 -d 5 -w 8 -m 2 -s 512 >> -q >> > Now that's interesting. I ran it for 100 rounds on > a 158 core Turin system, without hitting the issue. > > I'll play around with it some more to see whether > I can make it happen by varying the parameters, > but now I'm also wondering whether hardware > differences might be at play. The first thing I'd check is if you have the _exact_ same model, stepping and (especially) microcode version. BTW, it seems like the 'x86 mm' maintainers are cc'd here, but not the core x86 folks, so you missed Boris. They should probably be keeping an eye on this too.