linux-kernel - Re: [PATCH] x86/mce: Fix timer interval adjustment after logging a MCE event

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Message-ID: <20260114144813.GCaWesrQ7zdEftdV87@fat_crate.local>
Date: Wed, 14 Jan 2026 15:48:13 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Luck, Tony" <tony.luck@...el.com>
Cc: "Li, Rongqing" <lirongqing@...du.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	Yazen Ghannam <yazen.ghannam@....com>,
	"Zhuo, Qiuxu" <qiuxu.zhuo@...el.com>,
	Avadhut Naik <avadhut.naik@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH] x86/mce: Fix timer interval adjustment after logging a
 MCE event

Ok,

I can repro in a guest here too:

[  316.791005] mce: [Hardware Error]: Machine check events logged
[  316.793836] mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: 9c2041000000011b
[  316.797398] mce: [Hardware Error]: TSC 0 ADDR 6d3d483b 
[  316.800013] mce: [Hardware Error]: PROCESSOR 2:800f82 TIME 1768404431 SOCKET 0 APIC 0 microcode 800820d
[  628.086857] mce: [Hardware Error]: Machine check events logged
[  628.089625] mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: 9c2041000000011b
[  628.093156] mce: [Hardware Error]: TSC 0 ADDR 6d3d483b 
[  628.095739] mce: [Hardware Error]: PROCESSOR 2:800f82 TIME 1768404743 SOCKET 0 APIC 0 microcode 800820d
[  939.382727] mce: [Hardware Error]: Machine check events logged
[  939.385593] mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: 9c2041000000011b
[  939.389194] mce: [Hardware Error]: TSC 0 ADDR 6d3d483b 
[  939.391690] mce: [Hardware Error]: PROCESSOR 2:800f82 TIME 1768405054 SOCKET 0 APIC 0 microcode 800820d
[ 1250.678672] mce: [Hardware Error]: Machine check events logged
[ 1250.681584] mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 4: 9c2041000000011b
[ 1250.685221] mce: [Hardware Error]: TSC 0 ADDR 6d3d483b 
[ 1250.687786] mce: [Hardware Error]: PROCESSOR 2:800f82 TIME 1768405365 SOCKET 0 APIC 0 microcode 800820d

Timestamps are consistent with the observation.

Now on to find what causes this. Even if we can't find the proper commit,
I guess testing 6.18 and 6.12 - the LTS kernels - should be good enough as to
backport a fix there.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette