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McKenney" , linux-kernel@vger.kernel.org Subject: Re: call_rcu data race patch Message-ID: <20210918070836.GA19555@bender.morinfr.org> Reply-To: Guillaume Morin Mail-Followup-To: "Paul E. McKenney" , linux-kernel@vger.kernel.org References: <20210917191555.GA2198@bender.morinfr.org> <20210917211148.GU4156@paulmck-ThinkPad-P17-Gen-1> <20210917213404.GA14271@bender.morinfr.org> <20210917220700.GV4156@paulmck-ThinkPad-P17-Gen-1> <20210918003933.GA25868@bender.morinfr.org> <20210918040035.GX4156@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210918040035.GX4156@paulmck-ThinkPad-P17-Gen-1> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 17 Sep 21:00, Paul E. McKenney wrote: > That is them! There are some flags that control their activities: > > o rcu_data structure's ->nocb_gp_sleep field (rcuog) > o rcu_data structure's ->nocb_cb_sleep field (rcuoc) From the same kdump: crash> pd rcu_data:all | grep -E 'nocb_cb_sleep|nocb_gp_sleep|per_cpu' per_cpu(rcu_data, 0) = $69 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = false, per_cpu(rcu_data, 1) = $70 = { nocb_gp_sleep = 1 '\001', nocb_cb_sleep = true, per_cpu(rcu_data, 2) = $71 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 3) = $72 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 4) = $73 = { nocb_gp_sleep = 1 '\001', nocb_cb_sleep = true, per_cpu(rcu_data, 5) = $74 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 6) = $75 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 7) = $76 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 8) = $77 = { nocb_gp_sleep = 1 '\001', nocb_cb_sleep = true, per_cpu(rcu_data, 9) = $78 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 10) = $79 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 11) = $80 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 12) = $81 = { nocb_gp_sleep = 1 '\001', nocb_cb_sleep = true, per_cpu(rcu_data, 13) = $82 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 14) = $83 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 15) = $84 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, per_cpu(rcu_data, 16) = $85 = { nocb_gp_sleep = 1 '\001', nocb_cb_sleep = true, per_cpu(rcu_data, 17) = $86 = { nocb_gp_sleep = 0 '\000', nocb_cb_sleep = true, crash> -- Guillaume Morin