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Mon, 12 Sep 2022 12:48:05 +0000 Received: from VI1PR08MB3919.eurprd08.prod.outlook.com ([fe80::c5f9:a25b:a5f2:6094]) by VI1PR08MB3919.eurprd08.prod.outlook.com ([fe80::c5f9:a25b:a5f2:6094%5]) with mapi id 15.20.5612.022; Mon, 12 Sep 2022 12:48:05 +0000 Message-ID: <0e7eeb3c-41d6-9160-a83a-0965283d8132@arm.com> Date: Mon, 12 Sep 2022 13:48:04 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 Subject: [PING][PATCH] Update auxv cache when inferior pid is 0 (no inferior) Content-Language: en-US To: gdb-patches@sourceware.org References: <20220719144542.1478037-1-luis.machado@arm.com> <20220805154656.47903-1-luis.machado@arm.com> From: Luis Machado In-Reply-To: <20220805154656.47903-1-luis.machado@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: LO2P123CA0035.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600::23) To VI1PR08MB3919.eurprd08.prod.outlook.com (2603:10a6:803:c4::31) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: VI1PR08MB3919:EE_|DU0PR08MB9701:EE_|DBAEUR03FT064:EE_|GVXPR08MB7871:EE_ X-MS-Office365-Filtering-Correlation-Id: 1b1d2d3e-6631-4d5d-e89e-08da94bd0e5d x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DBAEUR03FT064.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR08MB7871 X-Spam-Status: No, score=-12.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, FORGED_SPF_HELO, GIT_PATCH_0, 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=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Sep 2022 12:48:18 -0000 On 8/5/22 16:46, Luis Machado via Gdb-patches wrote: > While adding support for MTE corefiles and running the MTE corefile tests, > I noticed a strange situation where loading the symbol file + core file > through the command line has a different behavior compared to firing up > GDB, loading the symbol file with the "file" command and then loading the > core file with the "core" command. > > I tracked this down to gdb/auxv.c:get_auxv_inferior_data returning empty > auxv data for pid 0, which gets cached. This is triggered by attempting to > read auxv data for the exec target. > > In the early stages of reading the core file, we're still using inferior pid > 0, so when we attempt to read auxv to determine corefile features, we get the > cached empty data vector again. This breaks core_gdbarch setup. > > The fix, suggested by John Baldwin, prevents caching auxv data for pid 0. > --- > gdb/auxv.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/gdb/auxv.c b/gdb/auxv.c > index 6154988f6dd..33a829a7573 100644 > --- a/gdb/auxv.c > +++ b/gdb/auxv.c > @@ -361,7 +361,7 @@ get_auxv_inferior_data (struct target_ops *ops) > struct inferior *inf = current_inferior (); > > info = auxv_inferior_data.get (inf); > - if (info == NULL) > + if (info == NULL || inf->pid == 0) > { > info = auxv_inferior_data.emplace (inf); > info->data = target_read_alloc (ops, TARGET_OBJECT_AUXV, NULL);