linux-kernel - Re: BUG: KCSAN: data-race in add_device

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Message-ID: <CAG48ez17i5ObZ62BtDFF5UguO-n_0qvcvrsqVp4auvq2R4NPTA@mail.gmail.com>
Date:   Mon, 7 Feb 2022 22:49:24 +0100
From:   Jann Horn <jannh@...gle.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Marco Elver <elver@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>
Cc:     pmenzel@...gen.mpg.de, "Theodore Y. Ts'o" <tytso@....edu>,
        LKML <linux-kernel@...r.kernel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: BUG: KCSAN: data-race in add_device_randomness+0x20d/0x290

+KCSAN people

On Mon, Feb 7, 2022 at 7:42 PM Jason A. Donenfeld <Jason@...c4.com> wrote:
> Thanks for the report. I assume that this is actually an old bug. Do
> you have a vmlinux or a random.o from this kernel you could send me to
> double check? Without that, my best guess, which I'd say I have
> relatively high confidence about,

Maybe KCSAN should go through the same instruction-bytes-dumping thing
as normal BUG() does? That might be helpful for cases like this...