linux-kernel - Re: general protection fault in perf_misc

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Message-ID: <20200928083819.GD1685@zn.tnic>
Date:   Mon, 28 Sep 2020 10:38:19 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        syzbot <syzbot+ce179bc99e64377c24bc@...kaller.appspotmail.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Jiri Olsa <jolsa@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: general protection fault in perf_misc_flags

On Mon, Sep 28, 2020 at 08:06:19AM +0200, Dmitry Vyukov wrote:
> Maybe it's just a random silent memory corruption in the end?...

Oh, the rabbit hole goes deeper. But if it is corruption, what is the
common element in all those? All those guests have run on the same
physical machine?

If so, you probably won't get any logs from it to search for MCEs or
so...? Maybe the GCE people can do some grepping :)

-- 
Regards/Gruss,
    Boris.

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