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Wed, 18 Sep 2019 08:58:26 -0700 (PDT) Received: from localhost ([121.137.63.184]) by smtp.gmail.com with ESMTPSA id m24sm5190036pgj.71.2019.09.18.08.58.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Sep 2019 08:58:25 -0700 (PDT) From: Sergey Senozhatsky X-Google-Original-From: Sergey Senozhatsky Date: Thu, 19 Sep 2019 00:58:23 +0900 To: Sergey Senozhatsky Cc: Qian Cai , Steven Rostedt , Petr Mladek , Catalin Marinas , Will Deacon , Dan Williams , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Peter Zijlstra , Waiman Long , Thomas Gleixner , Theodore Ts'o , Arnd Bergmann , Greg Kroah-Hartman Subject: Re: printk() + memory offline deadlock (WAS Re: page_alloc.shuffle=1 + CONFIG_PROVE_LOCKING=y = arm64 hang) Message-ID: <20190918155823.GB158834@tigerII.localdomain> References: <1566509603.5576.10.camel@lca.pw> <1567717680.5576.104.camel@lca.pw> <1568128954.5576.129.camel@lca.pw> <20190911011008.GA4420@jagdpanzerIV> <1568289941.5576.140.camel@lca.pw> <20190916104239.124fc2e5@gandalf.local.home> <1568817579.5576.172.camel@lca.pw> <20190918155059.GA158834@tigerII.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190918155059.GA158834@tigerII.localdomain> User-Agent: Mutt/1.12.1 (2019-06-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: A correction: On (09/19/19 00:51), Sergey Senozhatsky wrote: [..] > > zone->lock --> console_sem->lock > > So then we have > > zone->lock --> console_sem->lock --> pi_lock --> rq->lock > > vs. the reverse chain > > rq->lock --> console_sem->lock ^^^ zone->lock -ss