linux-kernel - Re: PROBLEM: CPU hotplug leads to NULL pointer dereference with RAPL enabled on AMD 2990WX

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Message-ID: <20210104095010.GA32151@zn.tnic>
Date:   Mon, 4 Jan 2021 10:50:10 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Johnathan Smithinovic <johnathan.smithinovic@....at>
Cc:     tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: CPU hotplug leads to NULL pointer dereference with RAPL
 enabled on AMD 2990WX

On Mon, Jan 04, 2021 at 12:02:44AM +0100, Johnathan Smithinovic wrote:
> CPU hotplug leads to NULL pointer dereference with RAPL enabled on AMD 2990WX
> 
> 
> When hot-plugging CPUs (e.g. manually or on suspend) I get a NULL
> pointer dereference in rapl_cpu_offline() for CPUs 16 and 24.
> It *seems* to me that this has to do with commit
> 700d098acec5271161606f3c0086b71695ea2ef8
> ("x86/CPU/AMD: Save AMD NodeId as cpu_die_id").
> When reverting said commit hotplug works again.

Yeah, known issue and I'm working on it.

Thx for reporting.

-- 
Regards/Gruss,
    Boris.

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