linux-kernel - Re: [PATCH v4] arm64: Enable KCSAN

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Message-ID: <CANpmjNP_M2R9XD8GnCJVTmN17GPOR_5Y3jX8r5AAKcaDRUWJ4A@mail.gmail.com>
Date:   Tue, 14 Dec 2021 20:11:24 +0100
From:   Marco Elver <elver@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Joey Gouly <joey.gouly@....com>
Subject: Re: [PATCH v4] arm64: Enable KCSAN

On Tue, 14 Dec 2021 at 19:24, Mark Rutland <mark.rutland@....com> wrote:
[...]
>
>   Reviewed-by: Mark Rutland <mark.rutland@....com>
>   Tested-by: Mark Rutland <mark.rutland@....com>

Thanks for taking a look and testing! Thought I'd update you re status
of some of the reports below. :-)

[...]
> * BUG: KCSAN: data-race in mutex_spin_on_owner+0xcc/0x150
> * BUG: KCSAN: data-race in rwsem_spin_on_owner+0xa8/0x13c

These are going away, fixes are already in -tip/-next.

> * UBSAN: object-size-mismatch in net/unix/af_unix.c:977:14

The UBSAN object-size-mismatch warnings are going away, as
fsanitize=object-size is broken/incomplete as it turns out --
UBSAN_OBJECT_SIZE will be removed from 5.17:
https://bugzilla.kernel.org/show_bug.cgi?id=214861#c4
... because all its warnings can also be covered by -Warray-bounds,
which Kees is working on enabling.

Thanks,
-- Marco