Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <e10b79cf-d6d5-ffcc-bce4-edd92b7cb6b9@molgen.mpg.de> <CAHmME9pktmNpcBS_DJhJ5Z+6xO9P1wroQ9_gwx8KZMBxk1FBeQ@mail.gmail.com>
In-Reply-To: <CAHmME9pktmNpcBS_DJhJ5Z+6xO9P1wroQ9_gwx8KZMBxk1FBeQ@mail.gmail.com>
From:   Jann Horn <jannh@google.com>
Date:   Mon, 7 Feb 2022 22:49:24 +0100
Message-ID: <CAG48ez17i5ObZ62BtDFF5UguO-n_0qvcvrsqVp4auvq2R4NPTA@mail.gmail.com>
Subject: Re: BUG: KCSAN: data-race in add_device_randomness+0x20d/0x290
To:     "Jason A. Donenfeld" <Jason@zx2c4.com>,
        Marco Elver <elver@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        kasan-dev <kasan-dev@googlegroups.com>
Cc:     pmenzel@molgen.mpg.de, "Theodore Y. Ts'o" <tytso@mit.edu>,
        LKML <linux-kernel@vger.kernel.org>,
        Dominik Brodowski <linux@dominikbrodowski.net>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

+KCSAN people

On Mon, Feb 7, 2022 at 7:42 PM Jason A. Donenfeld <Jason@zx2c4.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...