linux-kernel - 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

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Message-ID: <aPJNPPFKsPKJWlLn@eldamar.lan>
Date: Fri, 17 Oct 2025 16:05:48 +0200
From: Salvatore Bonaccorso <carnil@...ian.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Laurențiu Păncescu <lpancescu@...il.com>
Cc: x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	"Chang S. Bae" <chang.seok.bae@...el.com>,
	Andi Kleen <ak@...ux.intel.com>, Eric Biggers <ebiggers@...gle.com>,
	linux-kernel@...r.kernel.org, 1117002@...s.debian.org
Subject: 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

Hi,

In Debian Laurențiu Păncescu reported to see the following warnings on
his (admittely old system) with a Intel Atom CPU N450:

[...]
[    0.351035] smp: Bringing up secondary CPUs ...
[    0.351876] smpboot: x86: Booting SMP configuration:
[    0.351888] .... node  #0, CPUs:      #1
[    0.008282] Disabled fast string operations
[    0.008282] ------------[ cut here ]------------
[    0.008282] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/cpuid-deps.c:123 do_clear_cpu_cap+0xdc/0x130
[    0.008282] Modules linked in:
[    0.008282] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.9+deb14-amd64 #1 PREEMPT(lazy)  Debian 6.16.9-1
[    0.008282] Hardware name: ASUSTeK Computer INC. 1005PE/1005P, BIOS 1202    06/23/2010
[    0.008282] RIP: 0010:do_clear_cpu_cap+0xdc/0x130
[    0.008282] Code: 44 24 60 65 48 2b 05 6b 21 96 02 75 67 48 83 c4 68 5b 5d 41 5c 41 5d c3 cc cc cc cc 8b 15 54 1e 03 02 85 d2 0f 84 6f ff ff ff <0f> 0b e9 68 ff ff ff 48 c7 c7 a0 0b f2 b8 e8 11 ff ff ff f0 4c 0f
[    0.008282] RSP: 0000:ffffcd5fc00bfda8 EFLAGS: 00010002
[    0.008282] RAX: 0000000000000000 RBX: ffffcd5fc00bfda8 RCX: 0000000000000000
[    0.008282] RDX: 0000000000000001 RSI: 0000000000000070 RDI: ffffcd5fc00bfe08
[    0.008282] RBP: 0000000000000070 R08: 0000000000000000 R09: 706f20676e697274
[    0.008282] R10: 7473207473616620 R11: 64656c6261736944 R12: 0000000000000000
[    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]  <TASK>
[    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]  </TASK>
[    0.008282] ---[ end trace 0000000000000000 ]---
[    0.008282] ------------[ cut here ]------------
[    0.008282] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/cpuid-deps.c:123 do_clear_cpu_cap+0xdc/0x130
[    0.008282] Modules linked in:
[    0.008282] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G        W           6.16.9+deb14-amd64 #1 PREEMPT(lazy)  Debian 6.16.9-1
[    0.008282] Tainted: [W]=WARN
[    0.008282] Hardware name: ASUSTeK Computer INC. 1005PE/1005P, BIOS 1202    06/23/2010
[    0.008282] RIP: 0010:do_clear_cpu_cap+0xdc/0x130
[    0.008282] Code: 44 24 60 65 48 2b 05 6b 21 96 02 75 67 48 83 c4 68 5b 5d 41 5c 41 5d c3 cc cc cc cc 8b 15 54 1e 03 02 85 d2 0f 84 6f ff ff ff <0f> 0b e9 68 ff ff ff 48 c7 c7 a0 0b f2 b8 e8 11 ff ff ff f0 4c 0f
[    0.008282] RSP: 0000:ffffcd5fc00bfd18 EFLAGS: 00010002
[    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]  <TASK>
[    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]  </TASK>
[    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?

Regards,
Salvatore

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