linux-kernel - Re: seqcount usage in xt_replace

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Date:   Tue, 8 Jan 2019 16:36:46 -0800
From:   Anatol Pomozov <anatol.pomozov@...il.com>
To:     Andrea Parri <andrea.parri@...rulasolutions.com>
Cc:     fw@...len.de, Dmitry Vyukov <dvyukov@...gle.com>,
        Paul McKenney <paulmck@...ux.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: seqcount usage in xt_replace_table()

Hello

On Tue, Jan 8, 2019 at 4:02 PM Andrea Parri
<andrea.parri@...rulasolutions.com> wrote:
>
> Hi Anatol,
>
> On Tue, Jan 08, 2019 at 11:33:39AM -0800, Anatol Pomozov wrote:
> > Hello folks,
> >
> > A bit of context what I am doing. I am trying to port KTSAN (Kernel
> > Thread Sanitizer) tool to v4.20. That tool tracks shared data usage
> > and makes sure it is accessed in a thread-safe manner.
>
> Interesting!  FYI, some LKMM's maintainers (Paul included) had and
> continued to have some "fun" discussing topics related to "thread-
> safe memory accesses": I'm sure that they'll be very interested in
> such work of yours and eager to discuss your results.

Thread Sanitizer is a great tool to find thread-safety issues with
user-space code. The tool been developed by a team of smart people
from Google [1].

KTSAN is an attempt to bring the same ideas to Linux kernel [2]. A
bunch of work been done there but the project is still at
proof-of-concept point.

I am not a part of Google's dynamic tools team. But I've decided to
pick something to do during the New Year holidays so started porting
KTSAN from v4.2 to v4.20. The work is "almost completed" but I need to
fix a few crashes [3].

[1] https://github.com/google/sanitizers
[2] https://github.com/google/ktsan/wiki
[3] https://github.com/anatol/linux/tree/ktsan_4.20