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Mon, 11 Dec 2023 15:50:49 +0000 Date: Mon, 11 Dec 2023 15:50:35 +0000 From: Szabolcs Nagy To: Florian Weimer , Abhijit Ray Chaudhury Cc: Abhijit Ray Chaudhury via Libc-help Subject: Re: Does glibc support remote process backtracing Message-ID: References: <87o7ffpn7h.fsf@oldenburg.str.redhat.com> <87bkaxt82q.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <87bkaxt82q.fsf@oldenburg.str.redhat.com> X-ClientProxiedBy: LO4P123CA0566.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:33b::16) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|DBAPR08MB5686:EE_|DB5PEPF00014B9C:EE_|PAXPR08MB6541:EE_ X-MS-Office365-Filtering-Correlation-Id: 4b6d3f5e-a21c-4753-11c2-08dbfa60f786 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DB9PR08MB7179.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(39850400004)(376002)(136003)(396003)(366004)(346002)(230922051799003)(1800799012)(186009)(64100799003)(451199024)(4744005)(2906002)(41300700001)(38100700002)(110136005)(36756003)(86362001)(2616005)(6512007)(26005)(6666004)(478600001)(6486002)(6506007)(4326008)(5660300002)(44832011)(316002)(66556008)(66476007)(66946007)(8676002)(8936002)(67856001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Dec 2023 15:50:57.9620 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4b6d3f5e-a21c-4753-11c2-08dbfa60f786 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B9C.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAXPR08MB6541 X-Spam-Status: No, score=-5.5 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: The 12/11/2023 10:14, Florian Weimer via Libc-help wrote: > * Abhijit Ray Chaudhury: > > Hi Florian, > > > > Thanks a lot for replying. I need to do remote stack tracing , for which I am using libunwind-ptrace > > . The problem is it does not work on VDSOs . It treats VDSO memory mapping entry in > > /proc//maps as a file and tries to open it and subsequently fails. > > I tried mailing in libunwind-dev, but it seemed dormant . > > > > I need a library which works on both arm and x86_64 , do you think elfutils would be a good option > > ? > > The AArch64 vDSO did not have accurate unwinding information in the > past. We've got a Fedora bug for this: > > kernel: vDSO lacks unwind information on aarch64 > > > I don't know if this has been fixed since then. i believe it is not fixed.