linux-kernel - Re: [PATCH RFC] x86/cpu: fix intermittent lockup on poweroff

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Message-ID: <20230425193912.GEZEgsYDAsLn0EBAcH@fat_crate.local>
Date:   Tue, 25 Apr 2023 21:39:12 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tony Battersby <tonyb@...ernetics.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Mario Limonciello <mario.limonciello@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC] x86/cpu: fix intermittent lockup on poweroff

On Tue, Apr 25, 2023 at 03:26:53PM -0400, Tony Battersby wrote:
> In stop_this_cpu(), make sure the CPUID leaf exists before accessing the
> leaf.  This fixes a lockup on poweroff 50% of the time due to the wrong
> branch being taken randomly on some CPUs (seen on Supermicro X8DTH-6F
> with Intel Xeon X5650).

Please send the output of

cpuid -r

from that machine.

Thx.

-- 
Regards/Gruss,
    Boris.

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