From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 265EE33970F for ; Fri, 17 Oct 2025 14:26:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760711180; cv=none; b=qukmNBKf/rJfPuGxSJVRqqs7VDqlEksxYGvJU5HMhUZ+KPfdfkpq0O6tIcdeMCyEQb9whVWgSgq9HSnqPSsN1CEfUs7JACgM9tX57AZUlpjEu/+slxdCDQ3nm2HBbW/8PFglsssS8HAQWoufGZ8UDHJBh58+0cmiubxcAukiZ1I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760711180; c=relaxed/simple; bh=GEi6gBQmI47L7JB2L547+kIiTNO1mJCQfz3AZmP/Oco=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=rEnQw5OqvhNg7attVoxuK07PGaFB2bvp0RTUviVuizTTConMq9M0xrYdoO/0g00bfUDuJZOg5YPgUyMucuYVAMrUQh9llilR2MyDjh74Rpkg3sAYG7NKk+P5Zu5gl2fdaTjzY0WZa2wtNJGLjEeNjObjLGc0kkaiDiNeQYc0b0M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=F76yofh+; arc=none smtp.client-ip=192.198.163.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="F76yofh+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1760711179; x=1792247179; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=GEi6gBQmI47L7JB2L547+kIiTNO1mJCQfz3AZmP/Oco=; b=F76yofh+a7bFtTZF0gXEv4Up0cscj6+hn/4HkBF0UmqgM9CLJtkEun5Z 8rLIh3wV+osxB2Llj4wXLalj1uqur6v94d+ORNR21gSrEFjqE00GxecJ9 wj3oQSTLPzSNGs6syy/r8jgsLZGy8/ggoiXsPk8Pb12xCdJ9q/SCtX0Ve AghoXftE/hmsZVUmyLy1dNgIF1QgrMVp31iVg95sRCaXZQjSpAqoed4BP R93KGtWh2DofXeoXg40H/RoaT10Ey/1YixEwdCOQTT9LMucPoC43q5764 2XfXP90l3q/kQDtQRVysj7xOq4InOuKSKIIRoUafxx8Nl4bfysHeEPPiR g==; X-CSE-ConnectionGUID: LO7vfoajTySAO5NnmvLsNw== X-CSE-MsgGUID: bNYsCV4nRlGMLEIgj1g6xA== X-IronPort-AV: E=McAfee;i="6800,10657,11585"; a="63012274" X-IronPort-AV: E=Sophos;i="6.19,236,1754982000"; d="scan'208";a="63012274" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2025 07:26:18 -0700 X-CSE-ConnectionGUID: ofWPS03CQiGEZ6k2lcrNDw== X-CSE-MsgGUID: PrmO9UHNTNariydWTakaiA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,236,1754982000"; d="scan'208";a="187841778" Received: from spandruv-mobl4.amr.corp.intel.com (HELO [10.125.108.40]) ([10.125.108.40]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Oct 2025 07:26:18 -0700 Message-ID: Date: Fri, 17 Oct 2025 07:26:17 -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: WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/cpuid-deps.c:123 do_clear_cpu_cap+0xdc/0x130 on Intel(R) Atom(TM) CPU N450 system To: Salvatore Bonaccorso , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , =?UTF-8?Q?Lauren=C8=9Biu_P=C4=83ncescu?= Cc: x86@kernel.org, "H. Peter Anvin" , Sohil Mehta , "Chang S. Bae" , Andi Kleen , Eric Biggers , linux-kernel@vger.kernel.org, 1117002@bugs.debian.org References: From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/17/25 07:05, Salvatore Bonaccorso wrote: > [ 0.008282] RAX: 0000000000000000 RBX: ffffcd5fc00bfd18 RCX: 0000000000000000 > [ 0.008282] RDX: 0000000000000001 RSI: 0000000000000070 RDI: ffffcd5fc00bfd78 > [ 0.008282] RBP: 0000000000000070 R08: 0000000000000000 R09: 706f20676e697274 > [ 0.008282] R10: 7473207473616620 R11: 64656c6261736944 R12: ffffffffb8f20ba0 > [ 0.008282] R13: ffff8ad332718090 R14: 000000000000061c R15: 0000000000000000 > [ 0.008282] FS: 0000000000000000(0000) GS:ffff8ad378ec7000(0000) knlGS:0000000000000000 > [ 0.008282] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 0.008282] CR2: 0000000000000000 CR3: 000000005842c000 CR4: 00000000000006f0 > [ 0.008282] Call Trace: > [ 0.008282] > [ 0.008282] do_clear_cpu_cap+0x106/0x130 > [ 0.008282] early_init_intel.cold+0x4d/0x11a > [ 0.008282] init_intel+0x2a/0x2c0 > [ 0.008282] identify_cpu+0x18c/0x750 > [ 0.008282] identify_secondary_cpu+0x50/0xa0 > [ 0.008282] start_secondary+0x7c/0x160 > [ 0.008282] common_startup_64+0x13e/0x141 > [ 0.008282] > [ 0.008282] ---[ end trace 0000000000000000 ]--- > [ 0.354753] smp: Brought up 1 node, 2 CPUs > [ 0.354797] smpboot: Total of 2 processors activated (6666.06 BogoMIPS) > > Any ideas? That's a fun one. This looks to be this code: pr_info("Disabled fast string operations\n"); setup_clear_cpu_cap(X86_FEATURE_REP_GOOD); because we can see the pr_info() and I'm assuming that the 'feature' is X86_FEATURE_REP_GOOD (0x70) which we can see in RSI/RBP. But X86_FEATURE_REP_GOOD isn't even a real CPU feature, it's one of the synthetic ones. The only way I can see this happening is if MSR_IA32_MISC_ENABLE_FAST_STRING is mismatched between the boot CPU and a secondary. Could you boot the system on a known good kernel and run this, please? rdmsr -a 0x000001a0 That'll dump out MSR_IA32_MISC_ENABLE on all the CPUs. When was the last kernel that worked for you? Also, do you have old microcode? Can you dump the beginning of /proc/cpuinfo, please? processor : 21 vendor_id : GenuineIntel cpu family : 6 model : 170 model name : Intel(R) Core(TM) Ultra 7 155H stepping : 4 microcode : 0x24 I can see your microcode version in dmesg, but not the cpu model/family/stepping.