linux-kernel - Re: [PATCH 2/2] x86/numa: instance all parsed numa node

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Date:   Sun, 7 Jul 2019 21:44:00 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Pingfan Liu <kernelfans@...il.com>
cc:     x86@...nel.org, Michal Hocko <mhocko@...e.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Tony Luck <tony.luck@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Oscar Salvador <osalvador@...e.de>,
        Pavel Tatashin <pavel.tatashin@...rosoft.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Stephen Rothwell <sfr@...b.auug.org.au>, Qian Cai <cai@....pw>,
        Barret Rhoden <brho@...gle.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/numa: instance all parsed numa node

On Fri, 5 Jul 2019, Pingfan Liu wrote:

> I hit a bug on an AMD machine, with kexec -l nr_cpus=4 option. nr_cpus option
> is used to speed up kdump process, so it is not a rare case.

But fundamentally wrong, really.

The rest of the CPUs are in a half baken state and any broadcast event,
e.g. MCE or a stray IPI, will result in a undiagnosable crash.

Thanks,

	tglx