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[198.145.29.99]) by mx.google.com with ESMTPS id v1si20267860plo.191.2019.05.14.09.44.55 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 14 May 2019 09:44:56 -0700 (PDT) Received-SPF: pass (google.com: domain of srs0=/xha=to=goodmis.org=rostedt@kernel.org designates 198.145.29.99 as permitted sender) client-ip=198.145.29.99; Authentication-Results: mx.google.com; spf=pass (google.com: domain of srs0=/xha=to=goodmis.org=rostedt@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom="SRS0=/XhA=TO=goodmis.org=rostedt@kernel.org" Received: from oasis.local.home (50-204-120-225-static.hfc.comcastbusiness.net [50.204.120.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D709B2084F; Tue, 14 May 2019 16:44:54 +0000 (UTC) Date: Tue, 14 May 2019 12:44:53 -0400 From: Steven Rostedt To: Sultan Alsawaf Cc: Oleg Nesterov , Christian Brauner , Daniel Colascione , Suren Baghdasaryan , Tim Murray , Michal Hocko , Greg Kroah-Hartman , Arve =?UTF-8?B?SGrDuG5uZXbDpWc=?= , Todd Kjos , Martijn Coenen , Ingo Molnar , Peter Zijlstra , LKML , "open list:ANDROID DRIVERS" , linux-mm , kernel-team , Andy Lutomirski , "Serge E. Hallyn" , Kees Cook , Joel Fernandes Subject: Re: [RFC] simple_lmk: Introduce Simple Low Memory Killer for Android Message-ID: <20190514124453.6fb1095d@oasis.local.home> In-Reply-To: <20190513164555.GA30128@sultan-box.localdomain> References: <20190319221415.baov7x6zoz7hvsno@brauner.io> <20190319231020.tdcttojlbmx57gke@brauner.io> <20190320015249.GC129907@google.com> <20190507021622.GA27300@sultan-box.localdomain> <20190507153154.GA5750@redhat.com> <20190507163520.GA1131@sultan-box.localdomain> <20190509155646.GB24526@redhat.com> <20190509183353.GA13018@sultan-box.localdomain> <20190510151024.GA21421@redhat.com> <20190513164555.GA30128@sultan-box.localdomain> X-Mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit 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: On Mon, 13 May 2019 09:45:55 -0700 Sultan Alsawaf wrote: > On Fri, May 10, 2019 at 05:10:25PM +0200, Oleg Nesterov wrote: > > I am starting to think I am ;) > > > > If you have task1 != task2 this code > > > > task_lock(task1); > > task_lock(task2); > > > > should trigger print_deadlock_bug(), task1->alloc_lock and task2->alloc_lock are > > the "same" lock from lockdep pov, held_lock's will have the same hlock_class(). OK, this has gotten my attention. This thread is quite long, do you have a git repo I can look at, and also where is the first task_lock() taken before the find_lock_task_mm()? -- Steve