From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from arashi.greysector.net (arashi.greysector.net [51.68.141.79]) (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 34252331A52 for ; Thu, 27 Nov 2025 12:44:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=51.68.141.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764247501; cv=none; b=etetA+VaeqazD8v+Z4Tit4V34pTBBV4E7JwMBBt1yV9qKnZUbz+LrCiYP4knr7hpkuHSQ/rWJOBGyIraFVDMWrWwpkqiv5tlyEmIhtIopech/aNQxs7ZMDKUjHpAVyMcgVNqt0DPNepInJYmKIvyXD4CisCIrvhcCgToiG0pVNQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764247501; c=relaxed/simple; bh=gTUt4YS+KK9JD4QZBgGHnclTY3ieLHMWikS1tkR0MlQ=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dmHlwCTF6/pXqBHqFwP+AB9304dE9iu07HMEj0+Lg5a6VOVTEHir/CNG/1tZxXEDuRK5qWUuyt45wZIB+3AE3Qb3cPCQQ4PwjTqbMilwOPqFYdbFDEVtlDipBMJutBB0BfylJl3R0feZuzYsrKW43K+ejy4YSK6cq5Or4BLTVW8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=greysector.net; spf=pass smtp.mailfrom=greysector.net; dkim=pass (1024-bit key) header.d=greysector.net header.i=@greysector.net header.b=Kdl9eK9U; arc=none smtp.client-ip=51.68.141.79 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=greysector.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=greysector.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=greysector.net header.i=@greysector.net header.b="Kdl9eK9U" Received: from amaterasu.greysector.net (unknown [212.180.189.198]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by arashi.greysector.net (Postfix) with ESMTPSA id B21DE22AA; Thu, 27 Nov 2025 13:37:58 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 arashi.greysector.net B21DE22AA DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=greysector.net; s=default; t=1764247079; bh=wG2HychPRFz+xk9ulybmdUlFlyjRFTIAa0uUgZ3KHLc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Kdl9eK9UqlqOYl4ThsJpNLYrT3BuqjXdCj8g7k8wRrBk7UogmG0pVlQqQ9IiJxbhb akDQPtBGL86HWA2FtaL54Plpb8DxJbTOaylX7oxVAM+OcxsIGqDapMndFBXzOv6ia9 HzlmNXSPh1BVbLDt0tJCKuJ7TIMAD/+EDaM4+fz8= Date: Thu, 27 Nov 2025 13:37:57 +0100 From: Dominik 'Rathann' Mierzejewski To: Dave Hansen Cc: Salvatore Bonaccorso , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , =?utf-8?Q?Lauren=C8=9Biu_P=C4=83ncescu?= , x86@kernel.org, "H. Peter Anvin" , Sohil Mehta , "Chang S. Bae" , Andi Kleen , Eric Biggers , linux-kernel@vger.kernel.org, 1117002@bugs.debian.org 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 Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Hi! On Friday, 17 October 2025 at 16:26, Dave Hansen wrote: [...] > That's a fun one. I'm getting a similar trace on Fedora 42 with kernel-6.17.8: Nov 26 23:25:43 localhost kernel: ------------[ cut here ]------------ Nov 26 23:25:43 localhost kernel: WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/cpuid-deps.c:123 do_clear_cpu_cap+0xdc/0x130 Nov 26 23:25:43 localhost kernel: Modules linked in: Nov 26 23:25:43 localhost kernel: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.17.8-200.fc42.x86_64 #1 PREEMPT(lazy) Nov 26 23:25:43 localhost kernel: Hardware name: FOXCONN TPS01/TPS01, BIOS 080015 03/23/2010 Nov 26 23:25:43 localhost kernel: RIP: 0010:do_clear_cpu_cap+0xdc/0x130 Nov 26 23:25:43 localhost kernel: Code: 44 24 60 65 48 2b 05 5b 7f 49 03 75 67 48 83 c4 68 5b 5d 41 5c 41 5d c3 cc cc cc cc 8> Nov 26 23:25:43 localhost kernel: RSP: 0000:ffffcb40c00bfdb0 EFLAGS: 00010002 Nov 26 23:25:43 localhost kernel: RAX: 0000000000000000 RBX: ffffcb40c00bfdb0 RCX: 0000000000000000 Nov 26 23:25:43 localhost kernel: RDX: 0000000000000001 RSI: 0000000000000070 RDI: ffffcb40c00bfe10 Nov 26 23:25:43 localhost kernel: RBP: 0000000000000070 R08: 0000000000000000 R09: ffffcb40c00bfc28 Nov 26 23:25:43 localhost kernel: R10: ffffffff90f39a88 R11: 00000000ffffdfff R12: 0000000000000000 Nov 26 23:25:43 localhost kernel: R13: 0000000000000018 R14: 0000000000000000 R15: 0000000000000000 Nov 26 23:25:43 localhost kernel: FS: 0000000000000000(0000) GS:ffff89baab6c7000(0000) knlGS:0000000000000000 Nov 26 23:25:43 localhost kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 26 23:25:43 localhost kernel: CR2: 0000000000000000 CR3: 0000000019a2c000 CR4: 00000000000006f0 Nov 26 23:25:43 localhost kernel: Call Trace: Nov 26 23:25:43 localhost kernel: Nov 26 23:25:43 localhost kernel: early_init_intel.cold+0x47/0x112 Nov 26 23:25:43 localhost kernel: ? cpu_parse_topology+0xa4/0x170 Nov 26 23:25:43 localhost kernel: init_intel+0x26/0x2d0 Nov 26 23:25:43 localhost kernel: identify_cpu+0x193/0x7d0 Nov 26 23:25:43 localhost kernel: identify_secondary_cpu+0x4f/0xb0 Nov 26 23:25:43 localhost kernel: ? lapic_setup_esr+0x4d/0xa0 Nov 26 23:25:43 localhost kernel: start_secondary+0x7a/0x170 Nov 26 23:25:43 localhost kernel: common_startup_64+0x13e/0x141 Nov 26 23:25:43 localhost kernel: Nov 26 23:25:43 localhost kernel: ---[ end trace 0000000000000000 ]--- Nov 26 23:25:43 localhost kernel: ------------[ cut here ]------------ Admittedly, the machine is 15 years old. > 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. # rdmsr -a 0x000001a0 60840488 60840488 60840488 60840489 > When was the last kernel that worked for you? Out of available Fedora kernels, the last one without the WARNING is 6.9.12. > Also, do you have old microcode? I have version 0x107. I think there's no newer one for Atom D510. > Can you dump the beginning of /proc/cpuinfo, please? # head -n 27 /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 28 model name : Intel(R) Atom(TM) CPU D510 @ 1.66GHz stepping : 10 microcode : 0x107 cpu MHz : 1666.655 cache size : 512 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 ... Regards, Dominik -- Fedora https://fedoraproject.org Deep in the human unconscious is a pervasive need for a logical universe that makes sense. But the real universe is always one step beyond logic. -- from "The Sayings of Muad'Dib" by the Princess Irulan