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Mon, 27 Jan 2025 11:17:45 +0000 Received: from BLAPR10MB5267.namprd10.prod.outlook.com ([fe80::682b:c879:9f97:a34f]) by BLAPR10MB5267.namprd10.prod.outlook.com ([fe80::682b:c879:9f97:a34f%4]) with mapi id 15.20.8377.021; Mon, 27 Jan 2025 11:17:45 +0000 Message-ID: <54ff082d-5409-4fe6-b711-b80fdedd751e@oracle.com> Date: Mon, 27 Jan 2025 11:17:31 +0000 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH dwarves] btf_encoder: verify 0 address DWARF variables are really in ELF section To: Cong Wang Cc: acme@kernel.org, yonghong.song@linux.dev, dwarves@vger.kernel.org, ast@kernel.org, andrii@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, song@kernel.org, eddyz87@gmail.com, olsajiri@gmail.com, stephen.s.brennan@oracle.com, laura.nao@collabora.com, ubizjak@gmail.com References: <20241217103629.2383809-1-alan.maguire@oracle.com> Content-Language: en-GB From: Alan Maguire In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR01CA0022.apcprd01.prod.exchangelabs.com (2603:1096:4:192::14) To BLAPR10MB5267.namprd10.prod.outlook.com (2603:10b6:208:30e::22) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BLAPR10MB5267:EE_|CY8PR10MB7268:EE_ X-MS-Office365-Filtering-Correlation-Id: 92a8e939-7036-44ff-779e-08dd3ec4395c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|10070799003|376014|7416014|1800799024|7053199007; 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In the case of per-CPU variables their >>> ELF section address range starts at 0, so any 0 address variables will >>> appear to belong in that ELF section. However, for "discard" sections >>> DWARF encodes the associated variables with address location 0 so >>> we need to double-check that address 0 variables really are in the >>> associated section by checking the ELF symbol table. >>> >>> This resolves an issue exposed by CONFIG_DEBUG_FORCE_WEAK_PER_CPU=y >>> kernel builds where __pcpu_* dummary variables in a .discard section >>> get misclassified as belonging in the per-CPU variable section since >>> they specify location address 0. >> >> It is _not_ your patch's fault, but I got this segfault which prevents me from >> testing this patch. (It also happens after reverting your patch.) > > Never mind, I managed to workaround this issue by a clean build. > > And I tested your patch, it works for me with CONFIG_DEBUG_FORCE_WEAK_PER_CPU=y. > > Tested-by: Cong Wang > > Thanks a lot! Thanks for verifying the fix! You didn't happen to get a coredump or backtrace for the earlier segmentation fault by any chance? Just want to make sure there aren't other issues lurking here. Thanks again! Alan