From: Marco Elver <elver@google.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
Alan Stern <stern@rowland.harvard.edu>,
Alexander Potapenko <glider@google.com>,
Andrea Parri <parri.andrea@gmail.com>,
Andrey Konovalov <andreyknvl@google.com>,
Andy Lutomirski <luto@kernel.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Arnd Bergmann <arnd@arndb.de>, Boqun Feng <boqun.feng@gmail.com>,
Borislav Petkov <bp@alien8.de>, Daniel Axtens <dja@axtens.net>,
Daniel Lustig <dlustig@nvidia.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
David Howells <dhowells@redhat.com>,
Dmitry Vyukov <dvyukov@google.com>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
Jade Alglave <j.alglave@ucl.ac.uk>,
Joel Fernandes <joel@joelfernandes.org>,
Jonathan Corbet <corbet@lwn.net>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Luc Maranget <luc.maranget@inria.fr>,
Mark Rutland <mark.rutland@arm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Eric Dumazet <edumazet@google.com>,
kasan-dev <kasan-dev@googlegroups.com>,
linux-arch <linux-arch@vger.kernel.org>,
"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
linux-efi@vger.kernel.org,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
"the arch/x86 maintainers" <x86@kernel.org>
Subject: Re: [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN)
Date: Fri, 15 Nov 2019 13:02:08 +0100 [thread overview]
Message-ID: <CANpmjNPxAOUAxXHd9tka5gCjR_rNKmBk+k5UzRsXT0a0CtNorw@mail.gmail.com> (raw)
In-Reply-To: <20191114221559.GS2865@paulmck-ThinkPad-P72>
On Thu, 14 Nov 2019 at 23:16, Paul E. McKenney <paulmck@kernel.org> wrote:
>
> On Thu, Nov 14, 2019 at 10:33:03PM +0100, Marco Elver wrote:
> > On Thu, 14 Nov 2019, Paul E. McKenney wrote:
> >
> > > On Thu, Nov 14, 2019 at 07:02:53PM +0100, Marco Elver wrote:
> > > > This is the patch-series for the Kernel Concurrency Sanitizer (KCSAN).
> > > > KCSAN is a sampling watchpoint-based *data race detector*. More details
> > > > are included in **Documentation/dev-tools/kcsan.rst**. This patch-series
> > > > only enables KCSAN for x86, but we expect adding support for other
> > > > architectures is relatively straightforward (we are aware of
> > > > experimental ARM64 and POWER support).
> > > >
> > > > To gather early feedback, we announced KCSAN back in September, and have
> > > > integrated the feedback where possible:
> > > > http://lkml.kernel.org/r/CANpmjNPJ_bHjfLZCAPV23AXFfiPiyXXqqu72n6TgWzb2Gnu1eA@mail.gmail.com
> > > >
> > > > The current list of known upstream fixes for data races found by KCSAN
> > > > can be found here:
> > > > https://github.com/google/ktsan/wiki/KCSAN#upstream-fixes-of-data-races-found-by-kcsan
> > > >
> > > > We want to point out and acknowledge the work surrounding the LKMM,
> > > > including several articles that motivate why data races are dangerous
> > > > [1, 2], justifying a data race detector such as KCSAN.
> > > >
> > > > [1] https://lwn.net/Articles/793253/
> > > > [2] https://lwn.net/Articles/799218/
> > >
> > > I queued this and ran a quick rcutorture on it, which completed
> > > successfully with quite a few reports.
> >
> > Great. Many thanks for queuing this in -rcu. And regarding merge window
> > you mentioned, we're fine with your assumption to targeting the next
> > (v5.6) merge window.
> >
> > I've just had a look at linux-next to check what a future rebase
> > requires:
> >
> > - There is a change in lib/Kconfig.debug and moving KCSAN to the
> > "Generic Kernel Debugging Instruments" section seems appropriate.
> > - bitops-instrumented.h was removed and split into 3 files, and needs
> > re-inserting the instrumentation into the right places.
> >
> > Otherwise there are no issues. Let me know what you recommend.
>
> Sounds good!
>
> I will be rebasing onto v5.5-rc1 shortly after it comes out. My usual
> approach is to fix any conflicts during that rebasing operation.
> Does that make sense, or would you prefer to send me a rebased stack at
> that point? Either way is fine for me.
That's fine with me, thanks! To avoid too much additional churn on
your end, I just replied to the bitops patch with a version that will
apply with the change to bitops-instrumented infrastructure.
Also considering the merge window, we had a discussion and there are
some arguments for targeting the v5.5 merge window:
- we'd unblock ARM and POWER ports;
- we'd unblock people wanting to use the data_race macro;
- we'd unblock syzbot just tracking upstream;
Unless there are strong reasons to not target v5.5, I leave it to you
if you think it's appropriate.
Thanks,
-- Marco
next prev parent reply other threads:[~2019-11-15 12:02 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-14 18:02 [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Marco Elver
2019-11-14 18:02 ` [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure Marco Elver
2019-11-19 19:27 ` Qian Cai
2019-11-19 19:54 ` Marco Elver
2019-11-19 21:42 ` Qian Cai
2019-11-19 21:53 ` Marco Elver
2020-01-03 5:13 ` Qian Cai
2020-01-06 12:46 ` Marco Elver
2020-01-14 11:08 ` Qian Cai
2020-01-14 12:51 ` Marco Elver
2020-01-14 19:22 ` Paul E. McKenney
2020-01-14 20:30 ` Qian Cai
2020-01-14 21:34 ` Paul E. McKenney
2020-01-14 21:48 ` Qian Cai
2020-01-14 22:09 ` Paul E. McKenney
2019-11-14 18:02 ` [PATCH v4 02/10] include/linux/compiler.h: Introduce data_race(expr) macro Marco Elver
2019-11-14 18:02 ` [PATCH v4 03/10] kcsan: Add Documentation entry in dev-tools Marco Elver
2019-11-14 18:02 ` [PATCH v4 04/10] objtool, kcsan: Add KCSAN runtime functions to whitelist Marco Elver
2019-11-14 18:02 ` [PATCH v4 05/10] build, kcsan: Add KCSAN build exceptions Marco Elver
2019-11-14 18:02 ` [PATCH v4 06/10] seqlock, kcsan: Add annotations for KCSAN Marco Elver
2019-11-14 18:03 ` [PATCH v4 07/10] seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier Marco Elver
2019-11-14 18:03 ` [PATCH v4 08/10] asm-generic, kcsan: Add KCSAN instrumentation for bitops Marco Elver
2019-11-15 11:55 ` Marco Elver
2019-11-14 18:03 ` [PATCH v4 09/10] locking/atomics, kcsan: Add KCSAN instrumentation Marco Elver
2019-11-14 18:03 ` [PATCH v4 10/10] x86, kcsan: Enable KCSAN for x86 Marco Elver
2019-11-14 19:50 ` [PATCH v4 00/10] Add Kernel Concurrency Sanitizer (KCSAN) Paul E. McKenney
2019-11-14 21:33 ` Marco Elver
2019-11-14 22:15 ` Paul E. McKenney
2019-11-15 12:02 ` Marco Elver [this message]
2019-11-15 16:41 ` Paul E. McKenney
2019-11-15 17:14 ` Marco Elver
2019-11-15 20:43 ` Paul E. McKenney
2019-11-16 8:20 ` Marco Elver
2019-11-16 15:34 ` Paul E. McKenney
2019-11-16 18:09 ` Marco Elver
2019-11-16 18:28 ` Paul E. McKenney
2019-11-19 19:50 ` Qian Cai
2019-11-19 20:12 ` Qian Cai
2019-11-19 21:50 ` Marco Elver
2019-11-20 15:54 ` Marco Elver
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