From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE434C433EF for ; Sat, 18 Sep 2021 07:08:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6C0760F50 for ; Sat, 18 Sep 2021 07:08:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242536AbhIRHKD (ORCPT ); Sat, 18 Sep 2021 03:10:03 -0400 Received: from smtp4-g21.free.fr ([212.27.42.4]:34500 "EHLO smtp4-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242021AbhIRHKC (ORCPT ); Sat, 18 Sep 2021 03:10:02 -0400 Received: from bender.morinfr.org (unknown [82.64.86.27]) by smtp4-g21.free.fr (Postfix) with ESMTPS id 75DA719F57B; Sat, 18 Sep 2021 09:08:38 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=morinfr.org ; s=20170427; h=In-Reply-To:Content-Type:MIME-Version:References:Reply-To: Message-ID:Subject:To:From:Date:Sender:Cc:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=1qFwO3DrhH2zVLW4R4mdKKAUPYQ975frokWG+kY28E4=; b=vZ9fceg907Df+YembdRrVDxOIr hKn28jAWxRgXBBWlrS4xvciU28+K3h6r37ljuuXgCbq4cFDUgQ5VH/sq2XCYIFCZdhyIlh7DZBFQk Um6twlSQZooEMO3kgpEInn1mCBkroL1d1T8vZaFYwpremnhO+SIA/iK1KsG2aSgemz/0=; Received: from guillaum by bender.morinfr.org with local (Exim 4.92) (envelope-from ) id 1mRUSk-00056s-64; Sat, 18 Sep 2021 09:08:38 +0200 Date: Sat, 18 Sep 2021 09:08:38 +0200 From: Guillaume Morin To: "Paul E. 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