linux-ext4 - Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker)

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Date:   Wed, 4 May 2022 11:17:02 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Byungchul Park <byungchul.park@....com>
Cc:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        linux-ide@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
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        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Sasha Levin <sashal@...nel.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>, duyuyang@...il.com,
        johannes.berg@...el.com, Tejun Heo <tj@...nel.org>,
        "Theodore Ts'o" <tytso@....edu>,
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        Dave Chinner <david@...morbit.com>,
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        Al Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
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        dri-devel <dri-devel@...ts.freedesktop.org>,
        Dave Airlie <airlied@...ux.ie>, rodrigosiqueiramelo@...il.com,
        melissa.srw@...il.com, hamohammed.sa@...il.com, 42.hyeyoo@...il.com
Subject: Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker)

On Wed, May 4, 2022 at 1:19 AM Byungchul Park <byungchul.park@....com> wrote:
>
> Hi Linus and folks,
>
> I've been developing a tool for detecting deadlock possibilities by
> tracking wait/event rather than lock(?) acquisition order to try to
> cover all synchonization machanisms.

So what is the actual status of reports these days?

Last time I looked at some reports, it gave a lot of false positives
due to mis-understanding prepare_to_sleep().

For this all to make sense, it would need to not have false positives
(or at least a very small number of them together with a way to sanely
get rid of them), and also have a track record of finding things that
lockdep doesn't.

Maybe such reports have been sent out with the current situation, and
I haven't seen them.

                 Linus