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[95.203.6.24]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-30b8685b83fsm6073481fa.80.2025.02.28.11.12.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Feb 2025 11:12:54 -0800 (PST) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Fri, 28 Feb 2025 20:12:51 +0100 To: "Paul E. McKenney" Cc: Uladzislau Rezki , Boqun Feng , RCU , LKML , Frederic Weisbecker , Cheung Wall , Neeraj upadhyay , Joel Fernandes , Oleksiy Avramchenko Subject: Re: [PATCH v4 3/3] rcu: Use _full() API to debug synchronize_rcu() Message-ID: References: <20250227131613.52683-1-urezki@gmail.com> <20250227131613.52683-3-urezki@gmail.com> <1408fc88-e2c6-4f49-b581-0e9ad5620fe0@paulmck-laptop> <73724164-71f4-4671-b612-eb82a784da58@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <73724164-71f4-4671-b612-eb82a784da58@paulmck-laptop> Hello, Paul! > > > > > > > > > > Except that I got this from overnight testing of rcu/dev on the shared > > > > > RCU tree: > > > > > > > > > > WARNING: CPU: 5 PID: 14 at kernel/rcu/tree.c:1636 rcu_sr_normal_complete+0x5c/0x80 > > > > > > > > > > I see this only on TREE05. Which should not be too surprising, given > > > > > that this is the scenario that tests it. It happened within five minutes > > > > > on all 14 of the TREE05 runs. > > > > > > > > > Hm.. This is not fun. I tested this on my system and i did not manage to > > > > trigger this whereas you do. Something is wrong. > > > > > > If you have a debug patch, I would be happy to give it a go. > > > > > I can trigger it. But. > > > > Some background. I tested those patches during many hours on the stable > > kernel which is 6.13. On that kernel i was not able to trigger it. Running > > the rcutorture on the our shared "dev" tree, which i did now, triggers this > > right away. > > Bisection? (Hey, you knew that was coming!) > Looks like this: rcu: Fix get_state_synchronize_rcu_full() GP-start detection After revert in the dev, rcutorture passes TREE05, 16 instances. -- Uladzislau Rezki