From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2135.outbound.protection.outlook.com [40.107.236.135]) by sourceware.org (Postfix) with ESMTPS id CC73F3851C0A for ; Sun, 28 Jun 2020 00:50:44 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org CC73F3851C0A ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=URfuoXu0i2dN68bX52+vXEXknP4OkjpWYc2DEC/XhwVqRHNUyJtN5lTZ4bjQmOBBAvx+8QzuzRNKcUpipBsfUMNfVQiWILCFePgHWCovQNzEIUFr3VoXuz6yH+6W+pXcOkIlFNJABJhJxgTEAMsueVajZLMcX9Biw07bVmqObIxM4dW+Gdv4/4ak9uyd4paJ9wUK55YBgMPDW2BRJN5jJBKUZvnz4QSU4cVDOpgNkvBNE7CWt7+UMnoscsqLKXfBP6Cre9pybNlPmh1C4+7gDJPCDoL54Er5CZ593Dzx9FL/Ped8Zd5Znwxftp0tvixgUlAmmxyBIZw2aDhd6Uxgkg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TWybG0VlCStUwSX4xXNI3yYdqdoi0hTrcb1kqVTiyEs=; b=Cy2sDf7OyeXOQiqy2ErAR3SCw4wTkptldoVMq7g4kNq8soBsL9n5RRnVMZSJkAc1QaUeitKlvu4UQJ+h1Guh9Ogz6OeOMHGQ7YKH+2261YyvgaSKRplk4PT74In1O9WpmyvGabROBfN/r++TpIY/9MO4aAfM/9QVbr3BCFlt8Lg1WUxIHrac1+9gJlsuN7Q/iH0copqNyjkww9OhzqLDFFUW67rPdoWK53oEbXMTnW5U0aqDTdjvj5tMxAUSc1Jaqx6tXoe2S4jV75GrS1qv7lgOgXm2EidrjZmm8+be1UoUqxo9n5oUGG07sbAk+vrw320n13bIl7i6pZfRDEVSFw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=cornell.edu; dmarc=pass action=none header.from=cornell.edu; dkim=pass header.d=cornell.edu; arc=none Received: from MN2PR04MB6176.namprd04.prod.outlook.com (2603:10b6:208:e3::13) by MN2PR04MB6046.namprd04.prod.outlook.com (2603:10b6:208:dd::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3131.20; Sun, 28 Jun 2020 00:50:43 +0000 Received: from MN2PR04MB6176.namprd04.prod.outlook.com ([fe80::184d:a265:1d48:499a]) by MN2PR04MB6176.namprd04.prod.outlook.com ([fe80::184d:a265:1d48:499a%7]) with mapi id 15.20.3131.026; Sun, 28 Jun 2020 00:50:42 +0000 To: cygwin From: Ken Brown Subject: gdb and core files Message-ID: <7e6b53dd-ef3d-e451-86f9-1a2c3d12209e@cornell.edu> Date: Sat, 27 Jun 2020 20:50:39 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-ClientProxiedBy: CH2PR05CA0058.namprd05.prod.outlook.com (2603:10b6:610:38::35) To MN2PR04MB6176.namprd04.prod.outlook.com (2603:10b6:208:e3::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [192.168.0.17] (68.175.129.7) by CH2PR05CA0058.namprd05.prod.outlook.com (2603:10b6:610:38::35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3153.13 via Frontend Transport; Sun, 28 Jun 2020 00:50:42 +0000 X-Originating-IP: [68.175.129.7] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f84e64c5-4f0a-4d1f-086b-08d81afd48d3 X-MS-TrafficTypeDiagnostic: MN2PR04MB6046: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-Forefront-PRVS: 0448A97BF2 X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:MN2PR04MB6176.namprd04.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(4636009)(376002)(39860400002)(136003)(346002)(396003)(366004)(31686004)(186003)(26005)(478600001)(16526019)(36756003)(5660300002)(83380400001)(3480700007)(6666004)(966005)(52116002)(8676002)(2906002)(8936002)(31696002)(75432002)(786003)(316002)(86362001)(16576012)(6486002)(2616005)(956004)(66946007)(6916009)(66556008)(66476007)(43740500002)(460985005)(2480315003); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData: 6+heHlPVtsf6Otv91OLfjixIhW0JlZLrB/8/8f5ieIugj8rCkgtq6ArlpafNSXwqQXKk2pV79gJA0S4cOajkvKyQAL7TY1S2RVWiA4Qz3wJr1KF7u4NFMqVOBHCz6GAPvvNaEOxzLydPb4yvA8fzf1I0GKneRiD10kBYy3/RQ4I1BJqigXy2Mn4/2pxU/6I72mTQA73FH75PTgDKwyflW3X77ZSXY6IYqQU+jXMwNMqG6lc2eV3fIKiRayInyOuFCljppqxmzLxK+hYEyB3EwGS8657KqmsbH+nk5qeNDldhTRr14RQy7qHNIVlRFfVUlyUCXajGsldteh+EYqlISLg0RIegsFSh3/Bd1bjyCtUAPW8OAFLNW8ze2ghuBeJMBUr4wgkLWOPDh45remvmapmYko7WxHf69qr5gYAoNtoiCjtka5s32y5wVr5UmZImD1ii+MRMGqiUsuLWU77S+VMGB8zf7dms396yHryE5R0= X-OriginatorOrg: cornell.edu X-MS-Exchange-CrossTenant-Network-Message-Id: f84e64c5-4f0a-4d1f-086b-08d81afd48d3 X-MS-Exchange-CrossTenant-AuthSource: MN2PR04MB6176.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Jun 2020 00:50:42.6491 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5d7e4366-1b9b-45cf-8e79-b14b27df46e1 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: wgqpW8FJfnVlrIWIZuPGkHh3zaes/rslH9n2TFWTp+ScAU7pIymvjuWifSY8KTPEhq1eK4uYrfNyQ0Q7YnhNjQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR04MB6046 X-Spam-Status: No, score=-5.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_SHORT, MSGID_FROM_MTA_HEADER, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Jun 2020 00:50:47 -0000 Following the instructions at https://cygwin.com/cygwin-ug-net/using-cygwinenv.html, I tried to create a core file that I could examine with gdb, but I apparently ran into a gdb bug. I tried both gdb 9.2-1 and 8.3.1-1. Here are the results with 9.2-1. $ cat crash.c #include int main () { char *p = NULL; char c = *p; } $ gcc -g crash.c $ CYGWIN='error_start:c:\cygwin64\bin\dumper.exe' ./a *** starting debugger for pid 2034, tid 99552 $ gdb ./a.exe a.exe.core GNU gdb (GDB) (Cygwin 9.2-1) 9.2 [...] Reading symbols from ./a.exe... warning: core file may not match specified executable file. [New Thread 0x1b724] [New Thread 0x23450] [New Thread 0x16cb4] [New Thread 0x1c4b4] [New Thread 0x9050] warning: Unexpected size of section `.reg/112420' in core file. /wip/cygport-git/gdb/gdb-9.2-1.x86_64/src/gdb-9.2/gdb/corelow.c:640: internal-error: void core_target::get_core_register_section(regcache*, const regset*, const char*, int, int, const char*, bool): Assertion `m_core_vec != nullptr' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Quit this debugging session? (y or n) y This is a bug, please report it. For instructions, see: . /wip/cygport-git/gdb/gdb-9.2-1.x86_64/src/gdb-9.2/gdb/corelow.c:640: internal-error: void core_target::get_core_register_section(regcache*, const regset*, const char*, int, int, const char*, bool): Assertion `m_core_vec != nullptr' failed. A problem internal to GDB has been detected, further debugging may prove unreliable. Create a core file of GDB? (y or n) n Did I do something wrong? Ken