From: Borislav Petkov <bp@alien8•de>
To: Yazen Ghannam <yazen.ghannam@amd•com>
Cc: Bert Karwatzki <spasswolf@web•de>,
Mario Limonciello <mario.limonciello@amd•com>,
Nikolay Borisov <nik.borisov@suse•com>,
Tony Luck <tony.luck@intel•com>,
linux-kernel@vger•kernel.org, linux-next@vger•kernel.org,
linux-edac@vger•kernel.org, linux-acpi@vger•kernel.org,
x86@kernel•org, rafael@kernel•org, qiuxu.zhuo@intel•com,
Smita.KoralahalliChannabasappa@amd•com
Subject: Re: spurious (?) mce Hardware Error messages in v6.19
Date: Fri, 3 Apr 2026 16:05:01 +0200 [thread overview]
Message-ID: <20260403140501.GCac_JDVCaX0eCIDUj@fat_crate.local> (raw)
In-Reply-To: <20260223214825.GA3130@yaz-khff2.amd.com>
On Mon, Feb 23, 2026 at 04:53:16PM -0500, Yazen Ghannam wrote:
> Thanks Bert for confirming.
>
> I'll send a patch to filter this signature.
Bert, pls try this:
From: Yazen Ghannam <yazen.ghannam@amd•com>
Date: Sat, 28 Feb 2026 09:08:14 -0500
Subject: [PATCH] x86/mce/amd: Filter bogus hardware errors on Zen3 clients
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Users have been observing multiple L3 cache deferred errors after recent
kernel rework of deferred error handling.¹ ⁴
The errors are bogus due to inconsistent status values. Also, user verified
that bogus MCA_DESTAT values are present on the system even with an older
kernel.²
The errors seem to be garbage values present in the MCA_DESTAT of some L3
cache banks. These were implicitly ignored before the recent kernel rework
because these do not generate a deferred error interrupt.
A later revision of the rework patch was merged for v6.19. This naturally
filtered out most of the bogus error logs. However, a few signatures still
remain.³
Minimize the scope of the filter to the reported CPU
family/model/stepping and only for errors which don't have the Enabled
bit in the MCi status MSR.
¹ https://lore.kernel.org/20250915010010.3547-1-spasswolf@web.de
² https://lore.kernel.org/6e1eda7dd55f6fa30405edf7b0f75695cf55b237.camel@web.de
³ https://lore.kernel.org/21ba47fa8893b33b94370c2a42e5084cf0d2e975.camel@web.de
⁴ https://lore.kernel.org/r/CAKFB093B2k3sKsGJ_QNX1jVQsaXVFyy=wNwpzCGLOXa_vSDwXw@mail.gmail.com
[ bp: Generalize the condition according to which errors are bogus. ]
Fixes: 7cb735d7c0cb ("x86/mce: Unify AMD DFR handler with MCA Polling")
Closes: https://lore.kernel.org/20250915010010.3547-1-spasswolf@web.de
Reported-by: Bert Karwatzki <spasswolf@web•de>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd•com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8•de>
Reviewed-by: Mario Limonciello <mario.limonciello@amd•com>
Cc: stable@vger•kernel.org
Link: https://lore.kernel.org/20250915010010.3547-1-spasswolf@web.de
---
arch/x86/kernel/cpu/mce/amd.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 146f4207a863..7fc78759cd4e 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -606,6 +606,14 @@ bool amd_filter_mce(struct mce *m)
enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank);
struct cpuinfo_x86 *c = &boot_cpu_data;
+ /* Bogus hw errors on Cezanne A0. */
+ if (c->x86 == 0x19 &&
+ c->x86_model == 0x50 &&
+ c->x86_stepping == 0x0) {
+ if (!(m->status & MCI_STATUS_EN))
+ return true;
+ }
+
/* See Family 17h Models 10h-2Fh Erratum #1114. */
if (c->x86 == 0x17 &&
c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
--
2.51.0
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2026-04-03 14:05 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-15 1:00 spurious mce Hardware Error messages in next-20250912 Bert Karwatzki
2025-09-15 17:55 ` Yazen Ghannam
2025-09-15 21:03 ` Bert Karwatzki
2025-09-15 21:43 ` Bert Karwatzki
2025-09-16 9:10 ` Borislav Petkov
2025-09-16 14:07 ` Yazen Ghannam
2025-09-16 20:27 ` Bert Karwatzki
2025-09-17 7:13 ` Bert Karwatzki
2025-09-17 14:41 ` Yazen Ghannam
2025-09-17 15:33 ` Bert Karwatzki
2025-09-17 19:26 ` Yazen Ghannam
2025-09-17 21:15 ` Yazen Ghannam
2025-09-17 22:01 ` Bert Karwatzki
2025-09-18 10:20 ` Nikolay Borisov
2025-09-18 21:00 ` Yazen Ghannam
2025-09-18 21:04 ` Luck, Tony
2025-09-18 21:14 ` Yazen Ghannam
2025-09-18 22:07 ` Bert Karwatzki
2025-10-09 13:20 ` Yazen Ghannam
2026-02-12 12:50 ` spurious (?) mce Hardware Error messages in v6.19 Bert Karwatzki
2026-02-13 12:45 ` Bert Karwatzki
2026-02-16 20:25 ` Yazen Ghannam
2026-02-19 14:33 ` Yazen Ghannam
2026-02-19 15:43 ` Bert Karwatzki
2026-02-20 16:49 ` Mario Limonciello
2026-02-20 18:24 ` Bert Karwatzki
2026-02-23 21:53 ` Yazen Ghannam
2026-04-03 14:05 ` Borislav Petkov [this message]
2026-04-05 8:47 ` Bert Karwatzki
2026-04-05 10:46 ` Borislav Petkov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260403140501.GCac_JDVCaX0eCIDUj@fat_crate.local \
--to=bp@alien8$(echo .)de \
--cc=Smita.KoralahalliChannabasappa@amd$(echo .)com \
--cc=linux-acpi@vger$(echo .)kernel.org \
--cc=linux-edac@vger$(echo .)kernel.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linux-next@vger$(echo .)kernel.org \
--cc=mario.limonciello@amd$(echo .)com \
--cc=nik.borisov@suse$(echo .)com \
--cc=qiuxu.zhuo@intel$(echo .)com \
--cc=rafael@kernel$(echo .)org \
--cc=spasswolf@web$(echo .)de \
--cc=tony.luck@intel$(echo .)com \
--cc=x86@kernel$(echo .)org \
--cc=yazen.ghannam@amd$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox