From: Andrea Parri <andrea.parri@amarulasolutions.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: Dhaval Giani <dhaval.giani@gmail.com>,
Sasha Levin <alexander.levin@microsoft.com>,
shuah <shuah@kernel.org>, Kevin Hilman <khilman@baylibre.com>,
Tim Bird <tbird20d@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
"Carpenter,Dan" <dan.carpenter@oracle.com>,
willy@infradead.org, gustavo.padovan@collabora.co.uk,
Dmitry Vyukov <dvyukov@google.com>,
knut.omang@oracle.com, Nick Desaulniers <ndesaulniers@google.com>,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
Alan Stern <stern@rowland.harvard.edu>
Subject: Re: Linux Testing Microconference at LPC
Date: Sun, 12 May 2019 02:40:08 +0200 [thread overview]
Message-ID: <20190512004008.GA6062@andrea> (raw)
In-Reply-To: <20190423102250.GA56999@lakrids.cambridge.arm.com>
On Tue, Apr 23, 2019 at 11:22:50AM +0100, Mark Rutland wrote:
> On Thu, Apr 11, 2019 at 10:37:51AM -0700, Dhaval Giani wrote:
> > Hi Folks,
> >
> > This is a call for participation for the Linux Testing microconference
> > at LPC this year.
> >
> > For those who were at LPC last year, as the closing panel mentioned,
> > testing is probably the next big push needed to improve quality. From
> > getting more selftests in, to regression testing to ensure we don't
> > break realtime as more of PREEMPT_RT comes in, to more stable distros,
> > we need more testing around the kernel.
> >
> > We have talked about different efforts around testing, such as fuzzing
> > (using syzkaller and trinity), automating fuzzing with syzbot, 0day
> > testing, test frameworks such as ktests, smatch to find bugs in the
> > past. We want to push this discussion further this year and are
> > interested in hearing from you what you want to talk about, and where
> > kernel testing needs to go next.
>
> I'd be interested to discuss what we could do with annotations and
> compiler instrumentation to make the kernel more amenable to static and
> dynamic analysis (and to some extent, documenting implicit
> requirements).
>
> One idea that I'd like to explore in the context of RT is to annotate
> function signatures with their required IRQ/preempt context, such that
> we could dynamically check whether those requirements were violated
> (even if it didn't happen to cause a problem at that point in time), and
> static analysis would be able to find some obviously broken usage. I had
> some rough ideas of how to do the dynamic part atop/within ftrace. Maybe
> there are similar problems elsewhere.
>
> I know that some clang folk were interested in similar stuff. IIRC Nick
> Desaulniers was interested in whether clang's thread safety analysis
> tooling could be applied to the kernel (e.g. based on lockdep
> annotations).
FWIW, I'd also be interested in discussing these developments.
There have been several activities/projects related to such "tooling"
(thread safety analysis) recently: I could point out the (brand new)
Google Summer of Code "Applying Clang Thread Safety Analyser to Linux
Kernel" project [1] and (for the "dynamic analysis" side) the efforts
to revive the Kernel Thread sanitizer [2]. I should also mention the
efforts to add (support for) "unmarked" accesses and to formalize the
notion of "data race" in the memory consistency model [3].
So, again, I'd welcome a discussion on these works/ideas.
Thanks,
Andrea
[1] https://summerofcode.withgoogle.com/projects/#5358212549705728
https://github.com/ClangBuiltLinux/thread-safety-analysis
[2] https://github.com/google/ktsan/commits/ktsan
[3] https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=dev&id=c602b9e58cb9c13f260791dd7da6687e06809923
https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=dev&id=3b1fe99c68b5673879a8018a46b23f431e4d4b7a
https://lkml.kernel.org/r/Pine.LNX.4.44L0.1903191459270.1593-200000@iolanthe.rowland.org
next prev parent reply other threads:[~2019-05-12 0:40 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-11 17:37 Linux Testing Microconference at LPC Dhaval Giani
2019-04-18 10:22 ` Gustavo Padovan
2019-04-18 13:26 ` Steven Rostedt
2019-04-22 7:12 ` Guillaume Tucker
2019-04-23 8:37 ` Knut Omang
2019-04-23 10:22 ` Mark Rutland
2019-05-12 0:40 ` Andrea Parri [this message]
2019-05-22 15:52 ` Dmitry Vyukov
2019-05-23 14:03 ` Paul E. McKenney
2019-04-25 13:37 ` Veronika Kabatova
2019-04-26 21:02 ` Tim Bird
2019-05-16 0:39 ` Sasha Levin
2019-05-16 0:51 ` Tim.Bird
2019-05-22 16:04 ` Dmitry Vyukov
2019-05-22 16:07 ` Dhaval Giani
2019-05-22 15:48 ` Dmitry Vyukov
2019-05-23 0:07 ` Tim.Bird
2019-05-23 6:49 ` Dmitry Vyukov
2019-05-15 22:44 ` shuah
2019-05-15 23:19 ` Brendan Higgins
2019-05-16 0:36 ` Sasha Levin
2019-05-22 21:02 ` Brendan Higgins
2019-05-23 0:58 ` Steven Rostedt
2019-05-23 1:00 ` Steven Rostedt
2019-05-23 4:54 ` Knut Omang
2019-06-03 8:59 ` Brendan Higgins
2019-05-22 16:11 ` Dhaval Giani
2019-06-10 11:21 ` Douglas Raillard
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