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Mon, 18 May 2020 12:59:03 +0000 Date: Mon, 18 May 2020 13:59:01 +0100 From: Szabolcs Nagy To: Richard Henderson Subject: Re: tst-arm-mte bug: PSTATE.TCO is cleared on exceptions Message-ID: <20200518125901.GI27289@arm.com> References: <20200420102902.GE15401@arm.com> <20200506125709.GK23080@arm.com> <20200507095902.GA30635@arm.com> <5d0ae4c0-70a8-255c-9493-ca8b65e572fb@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5d0ae4c0-70a8-255c-9493-ca8b65e572fb@linaro.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: LO2P265CA0371.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a3::23) To AM6PR08MB3047.eurprd08.prod.outlook.com (2603:10a6:209:4c::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from arm.com (217.140.106.55) by LO2P265CA0371.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:a3::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3000.20 via Frontend Transport; Mon, 18 May 2020 12:59:03 +0000 X-Originating-IP: [217.140.106.55] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: dd844c3e-20d4-4d83-d26d-08d7fb2b4239 X-MS-TrafficTypeDiagnostic: AM6PR08MB4739:|AM6PR08MB4613: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:8882;OLM:8882; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB4613 Received-SPF: pass client-ip=40.107.1.64; envelope-from=Szabolcs.Nagy@arm.com; helo=EUR02-HE1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/18 09:14:14 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nd@arm.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The 05/07/2020 10:21, Richard Henderson wrote: > A reproducer would be most helpful. > > Something that can help is saving a VM snapshot with the kernel booted and the > user logged in, just ready to run the test program. Then you can get back to > exactly the state you want before things go wrong, even with a different qemu > build. i got some time to create a reproducer (with public code), temporarily hosting the binaries at http://port70.net/~nsz/tmp/qemu-bug.tar.gz ~251M here echo ./bug.sh | ./qemu-bug.sh crashes in about 1 minute (where qemu-bug.sh loads a snapshot with root shell and ./bug.sh triggers the bug) the disk rootfs is based on https://distfiles.adelielinux.org/adelie/1.0/iso/rc1/adelie-rootfs-aarch64-1.0-rc1-20200206.txz the kernel Image is linux mte-v3 with reverting the commit "arm64: mte: Check the DT memory nodes for MTE support" qemu is static linked from the branch tgt-arm-mte. the userspace workload that triggers the bug is using the adelie linux package manager with a malloc with tagging. (the malloc implementation is a modified version of https://github.com/richfelker/mallocng-draft the code is on the disk image, it has known issues, but it should not crash qemu) i will remove the file after a few days. hope this helps.