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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id n62sm9018306qkf.89.2019.02.19.11.08.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 19 Feb 2019 11:08:01 -0800 (PST) Message-ID: <1550603280.6911.43.camel@lca.pw> Subject: Re: soft lockups with SLAB_CONSISTENCY_CHECKS + KASAN_SW_TAGS (was: livelock with KASAN_SW_TAGS) From: Qian Cai To: Andrey Konovalov Date: Tue, 19 Feb 2019 14:08:00 -0500 In-Reply-To: References: <7ec14ad5-8d64-b842-a819-9d57cc8495e2@lca.pw> <20190214163536.GB1825@fuggles.cambridge.arm.com> <50ef4f07-af09-5498-2bca-26ced76d9736@lca.pw> <20190214180125.GH2475@fuggles.cambridge.arm.com> <20190215142350.GA6299@fuggles.cambridge.arm.com> <1550601754.6911.41.camel@lca.pw> X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190219_110804_061222_9D655D86 X-CRM114-Status: GOOD ( 10.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Will Deacon , kasan-dev , Linux ARM , Andrey Ryabinin , Dmitry Vyukov Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, 2019-02-19 at 19:56 +0100, Andrey Konovalov wrote: > Ah, so it doesn't lock, it's just very slow? memchr_inv() is the only > caller of check_bytes8(), so we could remove instrumentation from the > latter, and add one KASAN range check into the former. But I'd say > this is the expected behavior, KASAN slows down stuff and I don't > think it makes much sense to enable it together with other memory > debugging options. > Yes, just very slow. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel