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[217.140.101.70]) by mx.google.com with ESMTP id b43si1636038edf.182.2019.02.11.04.16.01 for ; Mon, 11 Feb 2019 04:16:01 -0800 (PST) Received-SPF: pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) client-ip=217.140.101.70; Authentication-Results: mx.google.com; spf=pass (google.com: domain of catalin.marinas@arm.com designates 217.140.101.70 as permitted sender) smtp.mailfrom=catalin.marinas@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 49AA980D; Mon, 11 Feb 2019 04:16:00 -0800 (PST) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.196.78]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C41B23F557; Mon, 11 Feb 2019 04:15:58 -0800 (PST) Date: Mon, 11 Feb 2019 12:15:56 +0000 From: Catalin Marinas To: Andrey Konovalov Cc: Qian Cai , Andrey Ryabinin , Alexander Potapenko , Dmitry Vyukov , kasan-dev , Linux ARM , Linux-MM Subject: Re: CONFIG_KASAN_SW_TAGS=y not play well with kmemleak Message-ID: <20190211121554.GB165128@arrakis.emea.arm.com> References: <89b343eb-16ff-1020-2efc-55ca58fafae7@lca.pw> <59db8d6b-4224-2ec9-09de-909c4338b67a@lca.pw> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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 Fri, Feb 08, 2019 at 06:15:02PM +0100, Andrey Konovalov wrote: > On Fri, Feb 8, 2019 at 5:16 AM Qian Cai wrote: > > Kmemleak is totally busted with CONFIG_KASAN_SW_TAGS=y because most of tracking > > object pointers passed to create_object() have the upper bits set by KASAN. > > Yeah, the issue is that kmemleak performs a bunch of pointer > comparisons that break when pointers are tagged. Does it mean that the kmemleak API receives pointer aliases (i.e. same object tagged with different values or tagged/untagged)? -- Catalin