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Mon, 4 Dec 2023 14:26:00 +0000 Message-ID: Date: Mon, 4 Dec 2023 14:25:54 +0000 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/3] Fix "attach" infinite loop To: Tom Tromey , Tom Tromey via Gdb-patches References: <20231003-attach-bug-v1-0-f5de2e583c5d@adacore.com> <87wmtxbz1n.fsf@tromey.com> Content-Language: en-US From: Luis Machado In-Reply-To: <87wmtxbz1n.fsf@tromey.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SA9PR13CA0022.namprd13.prod.outlook.com (2603:10b6:806:21::27) To VI1PR08MB3919.eurprd08.prod.outlook.com (2603:10a6:803:c4::31) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: VI1PR08MB3919:EE_|PAVPR08MB10339:EE_|DU2PEPF0001E9C4:EE_|AS8PR08MB6149:EE_ X-MS-Office365-Filtering-Correlation-Id: 8a1c67be-d17b-4e78-2469-08dbf4d4f7c6 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:VI1PR08MB3919.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(396003)(39860400002)(346002)(376002)(366004)(136003)(230922051799003)(1800799012)(186009)(64100799003)(451199024)(2906002)(31696002)(8936002)(8676002)(2616005)(31686004)(478600001)(53546011)(5660300002)(86362001)(44832011)(66556008)(66476007)(84970400001)(6666004)(6486002)(110136005)(6506007)(316002)(66946007)(41300700001)(36756003)(6512007)(26005)(83380400001)(38100700002)(43740500002)(45980500001);DIR:OUT;SFP:1101; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Dec 2023 14:26:13.0259 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a1c67be-d17b-4e78-2469-08dbf4d4f7c6 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: DU2PEPF0001E9C4.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6149 X-Spam-Status: No, score=-5.8 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: Hi Tom, On 12/1/23 17:41, Tom Tromey wrote: >>>>>> "Tom" == Tom Tromey via Gdb-patches writes: > > Tom> A user noticed that if you strace the non-main thread of a program, > Tom> then if you try to attach gdb to that program, gdb will enter an > Tom> infinite loop. > > Tom> This series fixes this bug, but has a couple extra small cleanup > Tom> patches as well. > > Tom> Regression tested on x86-64 Fedora 36. > > I'm going to push this series now. > > Tom I think patch 3 of this series (Bail out of "attach" if a thread cannot be traced) might have made gdb.threads/attach-many-short-lived-threads.exp unhappy. At least that's what the bisect indicates. I'm getting the following on aarch64-linux Ubuntu 22.04: FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 1: break at break_fn: 1 (the program is no longer running) FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 1: break at break_fn: 2 (the program is no longer running) FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 1: break at break_fn: 3 (the program is no longer running) FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 1: reset timer in the inferior FAIL: gdb.threads/attach-many-short-lived-threads.exp: iter 1: detach (the program is no longer running)