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Tue, 13 Aug 2019 14:41:32 +0000 From: Steve Capper To: Will Deacon Subject: Re: "arm64/for-next/core" causes boot panic Thread-Topic: "arm64/for-next/core" causes boot panic Thread-Index: AQHVUVgl/V1eSqMRPUyufGDCtItMGqb4yNmAgAAgpgCAABL2AIAAMcSA///5egA= Date: Tue, 13 Aug 2019 14:41:32 +0000 Message-ID: <20190813144130.GA15482@capper-ampere.manchester.arm.com> References: <1565646695.8572.6.camel@lca.pw> <20190813090200.h2rz4xphgnb5j5bc@willie-the-truck> <20190813105852.ovk5gtzddwlsm4ly@willie-the-truck> <20190813120643.25y5px4andu6cfwp@willie-the-truck> <20190813140451.GA24579@capper-ampere.manchester.arm.com> In-Reply-To: <20190813140451.GA24579@capper-ampere.manchester.arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mutt/1.10.1 (2018-07-13) x-originating-ip: [217.140.106.32] x-clientproxiedby: LO2P265CA0279.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a1::27) To DB8PR08MB4105.eurprd08.prod.outlook.com (2603:10a6:10:b0::12) Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Steve.Capper@arm.com; 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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, Aug 13, 2019 at 03:04:52PM +0100, Steve Capper wrote: > Hi Will, > > On Tue, Aug 13, 2019 at 01:06:44PM +0100, Will Deacon wrote: > > [+Steve] > > > > On Tue, Aug 13, 2019 at 11:58:52AM +0100, Will Deacon wrote: > > > On Tue, Aug 13, 2019 at 10:02:01AM +0100, Will Deacon wrote: > > > > On Mon, Aug 12, 2019 at 05:51:35PM -0400, Qian Cai wrote: > > > > > Booting today's linux-next on an arm64 server triggers a panic with > > > > > CONFIG_KASAN_SW_TAGS=y pointing to this line, > > > > > > > > Is this the only change on top of defconfig? If not, please can you share > > > > your full .config? > > > > > > > > > kfree()->virt_to_head_page()->compound_head() > > > > > > > > > > unsigned long head = READ_ONCE(page->compound_head); > > > > > > > > > > The bisect so far indicates one of those could be bad, > > > > > > > > I guess that means the issue is reproducible on the arm64 for-next/core > > > > branch. Once I have your .config, I'll give it a go. > > > > > > FWIW, I've managed to reproduce this using defconfig + SW_TAGS on > > > for-next/core, so I'll keep investigating. > > I've installed clang-8 and enabled CONFIG_KASAN_SW_TAGS and was able to > reproduce the problem quite rapidly. Many apologies for missing this > before in my testing. > > > > > Right, hacky diff below seems to resolve this, so I'll split this up into > > some proper patches as there is more than one bug here. > > > > Thanks, > > > > Will > > > > --->8 > > > > diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h > FWIW, this fixed the crashes I experienced, I'll run some additional > tests. > This works for me with 52-bit VAs + CONFIG_KASAN_SW_TAGS + CONFIG_DEBUG_VIRTUAL + CONFIG_DEBUG_VM FWIW: Tested-by: Steve Capper Cheers, -- Steve _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel