From: Mark Rutland <mark.rutland@arm.com>
To: Marco Elver <elver@google.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Joey Gouly <joey.gouly@arm.com>
Subject: Re: [PATCH v4] arm64: Enable KCSAN
Date: Wed, 15 Dec 2021 09:38:53 +0000 [thread overview]
Message-ID: <Ybm3rfq+9bNEX1Rt@FVFF77S0Q05N> (raw)
In-Reply-To: <CANpmjNP_M2R9XD8GnCJVTmN17GPOR_5Y3jX8r5AAKcaDRUWJ4A@mail.gmail.com>
On Tue, Dec 14, 2021 at 08:11:24PM +0100, Marco Elver wrote:
> On Tue, 14 Dec 2021 at 19:24, Mark Rutland <mark.rutland@arm.com> wrote:
> >
> > Reviewed-by: Mark Rutland <mark.rutland@arm.com>
> > Tested-by: Mark Rutland <mark.rutland@arm.com>
>
> Thanks for taking a look and testing! Thought I'd update you re status
> of some of the reports below. :-)
Thanks for the pointers below! I'll fold those into a test branch, so that I
can soak this under Syzkaller over the holiday break.
I've given precise refernces below in case I've misunderstood or missed
something.
> > * 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.
Cool! I assume that means commits:
* c0bed69daf4b6780 ("locking: Make owner_on_cpu() into <linux/sched.h>")
from https://lore.kernel.org/r/20211203075935.136808-2-wangkefeng.wang@huawei.com
* 4cf75fd4a2545ca4 ("locking: Mark racy reads of owner->on_cpu")
from https://lore.kernel.org/r/20211203075935.136808-3-wangkefeng.wang@huawei.com
... in the tip locking/core branch (the head commit of which is currently
5fb6e8cf53b005d2 ("locking/atomic: atomic64: Remove unusable atomic ops")).
> > * 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
I see the relevant patch is:
* "[PATCH] ubsan: Remove CONFIG_UBSAN_OBJECT_SIZE"
from https://lore.kernel.org/all/20211203235346.110809-1-keescook@chromium.org/
... and from looking at next-20211214 that's been picked up by Andrew Morton.
Thanks,
Mark.
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next prev parent reply other threads:[~2021-12-15 9:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-11 13:17 [PATCH v4] arm64: Enable KCSAN Kefeng Wang
2021-12-14 18:24 ` Mark Rutland
2021-12-14 19:11 ` Marco Elver
2021-12-15 9:38 ` Mark Rutland [this message]
2021-12-15 4:08 ` Kefeng Wang
2021-12-14 19:16 ` Catalin Marinas
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