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[209.85.167.49]) by smtp.gmail.com with ESMTPSA id m11-20020ac24acb000000b0047255d21130sm1266508lfp.95.2022.05.04.11.17.19 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 May 2022 11:17:19 -0700 (PDT) Received: by mail-lf1-f49.google.com with SMTP id x17so3729414lfa.10 for ; Wed, 04 May 2022 11:17:19 -0700 (PDT) X-Received: by 2002:a05:6512:b12:b0:44a:ba81:f874 with SMTP id w18-20020a0565120b1200b0044aba81f874mr15410699lfu.449.1651688238925; Wed, 04 May 2022 11:17:18 -0700 (PDT) MIME-Version: 1.0 References: <1651652269-15342-1-git-send-email-byungchul.park@lge.com> In-Reply-To: <1651652269-15342-1-git-send-email-byungchul.park@lge.com> From: Linus Torvalds Date: Wed, 4 May 2022 11:17:02 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH RFC v6 00/21] DEPT(Dependency Tracker) To: Byungchul Park Cc: Damien Le Moal , linux-ide@vger.kernel.org, Andreas Dilger , Ext4 Developers List , Ingo Molnar , Linux Kernel Mailing List , Peter Zijlstra , Will Deacon , Thomas Gleixner , Steven Rostedt , Joel Fernandes , Sasha Levin , Daniel Vetter , Chris Wilson , duyuyang@gmail.com, johannes.berg@intel.com, Tejun Heo , "Theodore Ts'o" , Matthew Wilcox , Dave Chinner , Amir Goldstein , "J. Bruce Fields" , Greg Kroah-Hartman , kernel-team@lge.com, Linux-MM , Andrew Morton , Michal Hocko , Minchan Kim , Johannes Weiner , Vladimir Davydov , sj@kernel.org, Jerome Glisse , Dennis Zhou , Christoph Lameter , Pekka Enberg , David Rientjes , Vlastimil Babka , ngupta@vflare.org, linux-block , paolo.valente@linaro.org, Josef Bacik , linux-fsdevel , Al Viro , Jan Kara , jack@suse.com, Jeff Layton , Dan Williams , Christoph Hellwig , "Darrick J. Wong" , dri-devel , Dave Airlie , rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, 42.hyeyoo@gmail.com Content-Type: text/plain; charset="UTF-8" X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Wed, May 4, 2022 at 1:19 AM Byungchul Park 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